Megohmmeter Model 1000N (Catalog# 185.100) Repair and Calibration Manual

Rev. 8 3/04

MEGOHMMETER MODEL 1000N (CATALOG# 185.100) REPAIR AND CALIBRATION MANUAL

MODEL 1000N REPAIR AND CALIBRATION MANUAL CAT. #185.100

TABLE OF CONTENTS

Repair and Technical Services...... 3 Introduction...... 4 Specific Features...... 4 Principal Characteristics ...... 4 Specifications ...... 6 Operation...... 7 Calibration ...... 11 Taking the Instrument Apart ...... 14 Troubleshooting...... 17 Summary of Malfunctions ...... 20 Component Parts List...... 21 Mechanical Parts List ...... 26 Test Points ...... 28 Power Board Schematic and Specifications ...... 29 Main Board ...... 30 Measure Board...... 31 High Voltage Board ...... 32 Schematics...... 33 & 34

Revision Description Date Approved 1 Updated Specs May 21, 1996 JPM 2 Updated Specs July 17, 1997 JPM 3 Updated Specs September 23, 1998 JPM 4 Updated Specs June 8, 1999 JPM 5 Added Power Supply Schematic and Specs August 25, 2000 JPM 6 Added changes to schematics November 13, 2000 JPM 7 Modified Board Drawings June 7, 2002 JPM 8 Z4, Z7 and Z9 changed to OP07C March 13, 2004 JPM

REV. 7: March 13, 2004 FILE LOCATION: Manuals - Cal. Man - 1000MAN.DOC 4/21/2005 MODEL 1000N REPAIR AND CALIBRATION MANUAL CAT. #185.100

REPAIR AND CALIBRATION

NOTE: Any attempts to repair and/or maintain this instrument, other than replacement of fuses and batteries, voids the warranty of the instrument. The presence of high voltages at certain locations requires servicing of this instrument by qualified personnel. It is recommended that the instrument be sent to an authorized service center. To guarantee that your instrument complies with the factory specifications, we recommend that the unit be submitted to our factory service center at one year intervals for recalibration, or as required by other standards. For instrument repair and/or calibration, please call our factory at (800) 945-AEMC. CHAUVIN ARNOUX®, Inc. d.b.a. AEMC® Instruments 15 Faraday Drive • Dover, NH 03820 USA (800) 945-2362 • (603) 749-6434 • Fax: (603) 742-2346 (Or contact your authorized distributor.) Estimates for repairs, normal recalibration, and calibration traceable to N.I.S.T. are available. All customers must call for an authorization number before returning any instrument.

TECHNICAL AND SALES ASSISTANCE If you are experiencing any technical problems, or require any assistance with the proper use or application of this instrument, please call our technical hotline: CHAUVIN ARNOUX®, Inc. d.b.a. AEMC® Instruments (800) 343-1391 • (508) 698-2115 • Fax: (508) 698-2118 www.aemc.com

REV. 7: March 13, 2004 FILE LOCATION: Manuals - Cal. Man - 1000MAN.DOC 4/21/2005 MODEL 1000N REPAIR AND CALIBRATION MANUAL CAT. #185.100

INTRODUCTION The Model 1000N Megohmmeter is a portable instrument which is essentially intended for performing insulation tests upon various components of electrical systems and equipment. The instrument allows completion of measurements according to multiple voltage levels (step voltage method), making it possible for the user to evaluate insulation quality and to plan preventive maintenance accordingly (especially for motors).

SPECIFIC FEATURES: • If a linear response were to be adopted for resistance and conductance, a high number of scales would be required on account of the extent of the measuring range which must be cover in practice, from 1 MΩ to 1000 GΩ. The use of logarithmic response circuitry reduces the number of scales to two. Each scale covering three decades. The accuracy is typically on the order of ± 5% over the entire range. • Selection of the test voltages does not cause the measuring range to change. It is very easy to determine the influence of voltage upon insulation. • An additional range is provided to cover from 1 kΩ to 1 MΩ. This range uses a constant current source (1 mA) to perform the measurement. The maximum open voltage is limited to approximately 1100 V. • A voltmeter range covering from 0 to 600 V AC or DC allows the user to verify whether or not the circuit where the insulation must be tested is energized. • Insulation testing and voltmeter functions are accompanied by a continuity test range from 0.1Ω to 100Ω. The logarithmic scale provides excellent accuracy between 0.1Ω to 1Ω. A fuse is used for overload protection in case of incorrect measuring procedures.

PRINCIPAL FEATURES: Insulation Testing: • Test voltages - The rotary selector switch allows the choice of five voltages: 50 V, 100 V, 250 V, 500 V, 1000 V. • Ranges for each test voltage MΩ: 1 MΩ to 1000 MΩ (typical accuracy: ± 5% of reading, max: ± 10% of reading) GΩ: 1 GΩ to 1000 GΩ (typical accuracy: ± 5% of reading, max: ± 10% of reading) KΩ: 1 KΩ to 1000 KΩ (typical accuracy: ± 5% of reading, max: ± 10% of reading) NOTE: From 100 GΩ to 1000 GΩ, the typical accuracy is ± 10% and max. is ± 20% of reading on the 50 V range.

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Continuity Testing: 0.1Ω to 100Ω (typical accuracy: ± 5% of reading, max: ± 10% of reading or 5 mΩ) The logarithmic scale is the same for the Ω and KΩ range. The 0.1Ω is calibrated at the output terminal of the instrument. You need to subtract the resistance value of the leads from your measurement if you need the accuracy under 10Ωs.

DC or AC Voltage Measurements: In order to ensure that the system under test is not energized, the instrument functions as a voltmeter as soon as it is connected, provided the push-to-measure button has not yet been pressed. This is the case for every range selected. Scale: 0 to 600V AC or DC: accuracy: 3% of full scale

Time Constant:

K M G Charging time (R reading) x (C reading) 0.04 Sec / µF 4 Sec / µF Discharging time 0.1 Sec / µF or 0.3 Sec / µF to decrease below 50 V

Safety Features: • This instrument is capable of withstanding overloads of up to 600 V for any selected function. • The continuity range is protected by a fuse inserted in the "G" (Guard) terminal and is accessible when the battery compartment is removed.

Influence: • Temperature: Twice the accuracy per 10° C variation Supply voltage: Half the accuracy for battery voltages between 9 and 13 Volts • Humidity: No significant influence up to 40° C and up to 70% relative humidity

Dielectric Strength: • 4000V RMS at 50 Hz for 1 minute between all input terminals and any accessible metal portions of the instrument. • Model with AC power supply accessory: Add test at 4000V RMS at 60 Hz for 1 minute between the AC outlet and any accessible metal portions of the instrument.

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SPECIFICATIONS: VOLTAGE TESTS (SAFETY CHECK) ELECTRICAL VOLTAGE RANGE: 0 to 600 V DC

INSULATION TESTS ACCURACY: 3% of full scale

DC TEST VOLTAGE: 50, 100, 250, 500, 1000 V GENERAL SPECIFICATIONS MEGOHM RANGE: AUDIBLE TEST SIGNAL: Ten beeps per minute for For each test voltage two direct reading ranges insulation and resistance tests; continuous tone for 1 to 1000 MΩ continuity test reading ≤ 200Ω 1 to 1000 GΩ (1,000,000 MΩ) POWER SUPPLY: Eight 1.5 V "AA" alkaline batteries SHORT CIRCUIT CURRENT: 5 mA (max) (NEDA 15A). Typical battery life: 350 one-minute tests; power consumed only when test button is 5% of reading typical ACCURACY: depressed; built-in battery check by green LED. 15 % of reading between 100 MΩ to 1000 GΩ on the 50V range OPTION: 110/220 V selectable, 47 to 400 Hz AC supply module 1000 MΩ range: 0.3 s/µF CHARGING TIME: 4000 V AC, 60 Hz, 1 min 1000 GΩ range: 4 s/µF DIELETRIC TEST: METER MOVEMENT: Rugged taut band suspension DISCHARGE TIME: Automatic discharge when test button is released; 0.1 DIMENSIONS: 7.7 X 5.2 X 3.75" (196 X 132 X 95 mm) s/µF WEIGHT: 2.2 lbs (1 kg) SCALE: Two large overlapping scales: 4.7" (119 mm) for each TEMPERATURE RANGE: 23 to 122°F (-5 to 50°C) range CASE: High impact gray polycarbonate TEST VOLTAGE GENERATION: Solid state circuitry generating rated test voltage TERMINALS: across the full range Color-coded safety terminals; guard terminals eliminates surface leakage errors

RESISTANCE TESTS SAFETY/REFERENCE STANDARDS

TEST CIRCUIT: Constant 1 mA DC

KILOHM RANGE: 1 to 1000 kΩ MAXIMUM TEST VOLTAGE: 1200 V DC

ACCURACY: 5% ± 100Ω of reading typical

CONTINUITY TESTS

TEST CURRENT: Constant 10 mA DC

OHM RANGE: 0.1 to 100Ω (3Ω midscale)

ACCURACY: 5% ± 0.05 Ω of reading typical FUSE PROTECTION: 0.3 A high interrupting capacity fuse

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OPERATION: a) Mode of Operation for MΩ and GΩ: An oscillator (Z1) provides a low voltage signal which is amplified by the transformer (T1) then rectified and filtered (CR201, C201). This high DC voltage is regulated through the divider (R202 to R209) and the operational amplifier (Z4). When the range switch is turned to select a new voltage range, the input of (Z4) is open. In order to prevent an increase in the high voltage, two diodes (CR12 and CR13) are connected to the + supply in order to always bring the output of Z4 to the + supply and stop the oscillation of Z5 and the high voltage. + - RX VHT

LOGARITHMIC AMPLIFIER

CR HV GENERATOR Vm RM

Vd G

DIVIDER BRIDGE MEASURING SHUNT

VHT VHT ∗ RM RX = 1 RM, or VM ~= ()VM RX

K VM = RX

Because RM is significantly lower than RX, the portion of the curve which is used, VM =f (RX ) , K can be expressed as a function . RX

Measurement for the MΩ range with test voltages of 50 and 100 Volts is performed by measuring the voltage drop on the shunts R101 and R102. For test voltages of 250, 500, 1000 Volts is performed through the current shunt R102 only. Measurement for the GΩ range is performed by measuring the voltage drop on the shunt R103. The resulting voltage is then filtered and passed through a variable gain amplifier (Z5) then into a logarithmic amplifier (Z4). Temperature compensation is provided to the amplifier by a thermistor (TH1). The last amplifier (Z7) provides the current needed to drive the meter movement G1. A negative 4.6 Volt supply is provided by (Z3) for powering the quad amplifier (Z2).

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The beeper (BZ1) is power by the oscillator (Z8) and the transistor (Q3) every six seconds, except for when in the ohm range where the comparator (Z2) allows the beeper to operate continuously for resistance levels under 200Ω. The comparator (Z2) permits the "BAT" led to turn off whenever the battery voltage is less than 9 V DC. The resistors (R214) and (R215) allow the circuit under test to discharge when the push-to- measure button is released. The protection of the measuring circuit in case of a short circuit between the positive and negative terminals is provided by the discharger (E101) for voltages exceeding 90 V. b) Mode of Operation for KΩ

+ - RX VHT

HV GENERATOR CR LOGARITHMIC AMPLIFIER

R Vd R104 Vm G

CONTROL SHUNT

During the operation of the circuit loop, VD = cte. Therefore, a constant current flows through (R104) and (RX). VHT varies in proportion to RX, and a resistance bridge permits bleeding of a portion of VHT in order to perform the measurement.

RX R104 VM = I + K K

I =CONSTANT

The voltage output is limited to approximately 1300 Volts when the measuring terminals are open.

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c) Voltmeter - Mode of Operation:

When the push-to-measure button is up, the Model 1000 Megohmmeter functions as a DC or an AC voltmeter. The input resistance is close to R214 + R215 = 90 KΩ. The voltage is reduced by means of (R212) and (R213) and rectified by the diode (CR10) and (CR11).

C202 1 uF

--Positive voltage

R212 R213 2.67 M 291 K --Positive alternation CR10 R214 47 K

+ R215 47 K G

R50 R51

C202 1 uF

--Negative voltage

R212 R213 2.67 M 291 K --Negative alternation CR11 R214 47 K

- R215 47 K G +

R51 R50

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d) Ohmmeter - Mode of Operation:

Measuring Amplifier

(Z5)

CONSTANT (RX) CURRENT GENERATOR (G) (R26)

Shift from 0 to 0.1 Ohm for Start of Scale

The high voltage section is not used when the instrument functions as a ohmmeter. (Q2) and (CR3) constitute a constant current generator. The current generated flows through the resistor under test (RX). The respective voltage (VRX) is directly measured by the amplifier (Z5).

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CALIBRATION:

Recommended Cleaning Procedures: The exterior should be cleaned periodically with a cloth moistened with water and a mild detergent solution. (Do not use chlorinated solvents or solvents containing hydrocarbons). Wipe the instrument and let it dry completely before using it again.

NOTE: The adjustment procedures described below should be performed under the following environmental conditions: Temperature: 21°C ± 3°C Humidity: 30 to 60% RH

Required Items: • 1 DC power source, with adjustable voltage between 8 to 15 V (1 A Max.) • 1 DC ammeter (minimum range: 0.5 A), with voltage drop less than 0.1 V. • 1 Voltmeter with 20,000 cts of resolution capable of measuring at least 10 V. Impedance ≥ 1 MΩ • 1 Set of resistors 1 MΩ, 100 MΩ, 1000 MΩ, 100 GΩ, 1000 GΩ (accuracy 1% or less, operating voltage > 1000 V). • 1 Resistor 100 Ω / 1% • 1 Resistor 0.1 Ω / 1% • 1 AC power source, 0 to 600 V 50/60 Hz ± 1%

Calibration Procedures: a) With the push-to-measure button disengaged, provide 600 V AC between the + terminal (green) and the - coaxial plug. The reading must be between 582 and 618 V (± 3% fs). Otherwise consult the troubleshooting section. b) Remove the bottom portion of the instrument by unscrewing the two center screws when the push-to-measure button is up, (See section B on page 13). This allows access to the adjustment potentiometers.

IMPORTANT: This is a high precision instrument. It is very important to keep the printed circuit boards absolutely clean. Do not touch the circuit boards with fingers and prevent foreign substances from coming into contact with the boards. c) Initial Conditions: Place the potentiometer A1 to the farthest counter-clockwise position.

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d) Offset adjustment of the amplifier (Z5) when RX = ∞ (open) • Supply the Model 1000 with 10.5 V DC. • Connect the voltmeter between the T and D solder pins (the ground connection D can be made on the spacer of the high voltage switch.) • Select the 250 V / MΩ range and push down the on/off switch. The beeper must "beep" approximately every 6 seconds. • Adjust the potentiometer A101 to obtain a reading of 0 ± 40 µV on the voltmeter. • Select the 50 V / GΩ range and verify the reading is still 0 ± 200 µV. • Select the 1000 V / GΩ and adjust the potentiometer A103 to read 0 ± 200 µV on the voltmeter.

NOTE: Because the two settings are highly sensitive, it is necessary to allow a few seconds between adjustments in order to obtain a stable reading, especially for the GΩ range. Never short circuit the terminals at this stage, a memory effect on the input capacitor may produce an incorrect zero.

e) Adjusting the "1" point on the MΩ scale: • Select the 500 V / MΩ range and measure 1 MΩ. • Adjust the potentiometer A4 to read "1" on the MΩ scale.

f) Adjusting the "100" point on the MΩ scale: • Select the 500 V / MΩ range and measure 100 MΩ. • Adjust the potentiometer A5 to read "100" on the MΩ scale.

g) Adjusting the "1000" point on the MΩ scale: • Select the 500 V / MΩ range and measure 1000 MΩ. • Adjust the potentiometer A102 to read "1000" on the MΩ scale.

NOTE: The adjustment of the potentiometer A5 and A102 are interdependent. It is necessary to perform these two tests until the two readings are perfect.

h) Adjusting the Ohmmeter: • Select the 10 mA range on the instrument. • Measure 100Ω and adjust the potentiometer A2 to read "100" on the ohms scale. • Measure 0.1Ω and adjust A3 to read "0.1" on the ohms scale. • During this adjustment check the reading on the voltmeter connected between the point T and D. The value must be positive ( ≅ + 8 mV ). Otherwise, it is necessary to continue adjusting A3. • It is necessary to verify the linearity at several locations. • The deviation should be less than or equal to 1 mV from the theoretical value (or 5%). • For resistor values under 200Ω the beeper must be "on" continuously.

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NOTE: The 0.1Ω resistor must include the value of the leads used in the calibration.

i) Adjustment of the Short Circuit Current: • Connect an ammeter in series with the battery supply and adjust battery voltage to 9 V DC. • Select the 1000 V / MΩ range. • Measure RX = 1 MΩ and note the power consumption on the ammeter. • Measure RX = 0 and adjust A1 to obtain the prior current ± 20%. • The green LED should turn off when the battery voltage drops below 9 V.

j) Select the 1000 V / GΩ range and measure RX = 1 MΩ, 10 MΩ, then 100 MΩ. The needle must always deflect to the left side. If not, add the diodes CR14 and CR15 to the main board. (If not already modified).

NOTE: Let the instrument set for at least one hour before testing the specification on all the ranges. The short circuit on step “j” disturbs the offset of the amplifier especially on the 50 V / GΩ range.

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TAKING THE INSTRUMENT APART: Necessary Tools: • Standard screwdriver • 30 W soldering iron • Desoldering iron • Phillips No 2 screwdriver

A) Opening the Battery Compartment: • Be sure the push-to-measure button is up (instrument off). • Place the instrument on the table with the front panel down and loosen the four embedded screws holding the battery compartment closed. Pick up the instrument with one hand and turn it over while covering the open battery compartment with the other hand. This allows the battery pack to be removed easily. Then place the instrument back on the table with the front panel down while holding the exposed battery pack. Be careful not to damage the battery connector when disconnecting it.

B) Removing the Bottom Case: • Be sure the push-to-measure button is up (instrument off). • Place the instrument on the table with the front panel down. • Use a screwdriver to loosen the two center screws which secure the bottom panel. • Lift up the bottom panel and turn it upside down in order to let the two screws drop out. • Set the bottom down and disconnect the battery connector. • During reassembly, the same procedure should be done in reverse order.

C) Removing the Printed Circuit Board Assembly: • The push-to-measure button must be engaged in order to lock the spring and ball mounted within the cap. • Set the instrument upon the table with the front panel facing downward (after removal of the front panel). Use a Philips screwdriver to loosen the three fastening screws holding the bottom board to the front panel. • With a standard screwdriver, unscrew the large center screw beneath the printed circuit assembly. Remove all the screws and desolder the wire from the green terminal. The board assembly can now be lifted slightly to allow the desoldering of the shielded cable, its ground connection, and the red wire from the blue terminal. • In order to remove the set of printed boards from the case, pull the high voltage transformer forward and tilt the boards over the table before unsoldering the two galvanometer wires.

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D) Removing the Selector Switch Rod: • Place the top panel on the table in an upside down position. • Remove the attachment clamp and then remove the metal washer and spring washer. Lift up the panel in order to remove the selector switch rod. • The same procedure should be completed in reverse during reassembly.

E) Removing the Galvanometer: • With the case turned forward, use a Philips screwdriver to remove the two screws which secure the galvanometer. Use two fingers to gently push aside the two splines that hold the dial in place. Lift the galvanometer with other hand and remove it. • The same procedure should be completed in reverse during reassembly.

WARNING: The inner portion of the transparent surface is covered by an antistatic solution. Avoid rubbing or cleaning this part if you do not have a replacement for this solution.

F) Removing the Bottom Board (disassembling): • The push-to-measure button must be locked into a lower position. • With the bottom resting upon the table, unsolder the four wires coming from the high voltage switch, then the two wires from the transformer (red and black). Remove the screw fastening the high voltage switch (located on the high voltage board). • Turn the instrument over and removed the seven screws which secure the bottom board. • As you pull the high voltage push button outward, turn the bottom board in relation to the supporting layer. • At this point all of the components on the bottom board are accessible.

G) Removing the High Voltage Board: • The high voltage button must be locked into a lower position. • The bottom board must face downward, toward the table. • Unsolder the three connecting wires between the high voltage board and the high voltage switch. Then the two wires from the transformer (red and black). • Remove the six fastening screws (three of these screws are secured by a flat washer and a lock washer). • Turn the high voltage board in relation to the supporting layer.

H) Removing the Measurement Board: • Remove the bottom and then the high voltage board as described above.

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I) Reassembling the Printed Circuit Boards: • In order to reassemble the printed boards, complete the previously described procedures in reverse, but do not tighten the screws completely. Slide the rod into the selector switch opening to ensure proper alignment of the boards. The rod must be able to turn freely without being obstructed. Then you can tighten all the screws.

J) Removing the High Voltage Switch: • The high voltage button must be locked into a lower position. • Position the bottom board so that the circuits face upward. • Use the desoldering iron to undo the eight solder points between the high voltage switch and the bottom board. • Turn the bottom board over and perform the same procedures described in Section H. • During reassembly, the same procedure should be done in reverse order.

K) Reinstalling the Printed Circuit Assembly: • The push-to-test button should be engaged. • With the panel turned forward, place the printed circuit boards beside it. The bottom board should face up. • Be sure the LED is perpendicular to the printed circuit boards. • Resolder the two galvanometers. The red wire should be connected to the positive terminal and the green wire to the negative terminal. • Place the printed circuit board assembly into the panel without pushing it in entirely. • Resolder the wire for the negative terminal (white) to the bottom board, along with the respective ground wire (yellow). Then resolder the guard terminal wire (red). • Fully secure the bottom board with the three Philips screws and the center screw. • Resolder the last wire (white Teflon) to the positive terminal (green).

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TROUBLESHOOTING: Check the condition of the batteries before performing any troubleshooting procedures. The green "BAT" light turns of whenever battery condition is lower than approx. 9 Volts (See Section A on page 13). While taking the instrument apart, consult the wiring diagrams and board layouts. These diagrams indicate various testing points for the unit. Necessary Items for Troubleshooting: • Standard screwdriver • 30 W soldering iron • Philips screwdriver • 15 V DC power supply (1 Amp) • 5 V DC power supply (100 mA) • 50 V/Div. oscilloscope • Voltmeter with 10 µV resolution and a minimum input resistance of 1 MΩ • 1 MΩ resistor (voltage > 1000 V)

IMPORTANT: Because the circuits must be kept absolutely clean in order to insure the accuracy of the instrument, careful handling is essential. The high voltage switch, the high voltage board, and the measuring circuit should be manipulated by means of the transformer or the printed circuit assembly.

Indications of Improper Functioning: (1) The instrument does not function at all (no movement of the pointer; the battery light is not lit; the beeper does not operate): • Set the selector switch at 50 MΩ, with the push-to-measure button in a raised position. • Open the battery compartment in the manner described in section A on page 13. • Disconnect the battery connector. • Test the eight 1.5 V alkaline "AA" batteries. • If the voltage is less than 10 V, replace the batteries. Be sure to maintain the proper polarities. • If the voltage is higher than 10 V, reconnect the battery connector. • Measure the voltage level at the terminals for (C102). These terminals are accessible from the battery opening. If there is no voltage, the battery connector is not connected. If the voltage decreases sharply, (C102) is defective. • If the proper voltage is present in the above measurement, press the push-to-measure button. If the voltage drops sharply, a component within the bottom board is consuming excessive power. This will require the disassembly of the bottom circuit board. (See Section C on page 13). • Unsolder the wires extending from the primary on the high voltage transformer.

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• Supply voltage to the circuits with a voltage level of 12 V while monitoring the current with an ammeter connected in series. Normal consumption is typically less than 50 mA. • Excessive power consumption may be attributed to a short circuit at (Q1), or to defects in the integrated circuits identified as (Z1), (Z4), and (Z8). Because these circuits are situated upon mountings, they should be disconnected one by one until proper power consumption is obtained. • If none of the previously cited circuits is defective, it is advisable to check the capacitors identified as (C24) and (C25) for probable leakage or short-circuiting. • When the proper power consumption has been obtained, check the + 5 V and the - 5 V levels, as well as the voltage level of diode (CR1) (+ 2.5 V). • Disconnect the power source and reconnect the primary of the transformer.

2) Checking the Zero Setting for 1000 V / GΩ: • Reassemble the three printed circuit boards. Then fit the rod into the switch and select 250 V / MΩ. • Supply 10.5 Volts to the instrument. Place the voltmeter between point T and point D, and perform the calibration procedure contained in Section d on page 11. • If the voltage at point T exceeds 0 ± 200 µV when the selector is in the 1000 MΩ position, it will be necessary to clean all of the printed circuit boards. • Disconnect the instrument and remove the small white push button for the high voltage switch, the push button cap, and the respective ball bearing and spring. These components should not be placed in the cleaning solution while the circuits are soaking. After drying, reinstall these items within the panel and perform all of the indicated calibration procedures. (Consult Section b on page 10)

3) The battery light is lit and the beeper operates properly but measurement is not possible: Select the 250 V / MΩ range and connect a voltmeter set to the 1000 Volt range to the measuring terminals. (a) No voltmeter movement (control component not functioning). • The circuit boards will have to be removed. • Place the circuit boards upon the respective supporting layer (transformer facing up) and fit the rod into the switch. Then select the 250 V / MΩ range. • Supply 12 Volts to the circuit and verify the supply and reference voltage levels. It is possible to check the open loop control sequence by adopting the following precautions. • Open the loop at the point identified as (h) on the high voltage board. Position the high voltage board switch between the 50 V and 100 V plugs. A finite gain should be established for the control loop by placing a resistor which can provide a sufficient number of KΩ between the lugs identified as (2) and (3) within (Z1). • The control loop should be placed in operation by supplying a voltage level of + 5 V (to start from zero) to approximately + 2.5 V at point (h). This voltage level corresponds to the theoretical control point. 18

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• Check the test points identified as (4), (5), (6), and (8). • Proper functioning at point (6): Check (T1), (CR201), and (C201). • Proper functioning at point (5), but not at point (6): Check (Q1) and (CR2). • No oscillation at point (5): Check the voltage level at the lug identified as (1) on (Z1). • Voltage ≈ 2.5 V: (Z1) is defective. • Voltage level not equal to 2.5 V: Check (Z4) or (CR5) and replace defective component. Proceed in accordance to the description of removal of printed circuit boards on pg. 13. • Replace the circuit boards and proceed with verification of zero setting for 1000V / MΩ. • Remove the bottom circuit board in order to gain access to the components. • After reassembling the circuit board, complete the procedures in Section d on pg 11. (b) The voltmeter reading is 250V (high voltage available, but measuring circuit is not functioning): • Check the fuse (F101, 0.315 A) that is accessible after removing the battery compartment cover. (See Section A, on page 13). • If the fuse is defective, it must be replaced. • If the fuse is not defective, it is necessary to remove the bottom panel. • Connect the voltmeter between the locations identified as T and D (an identical grounding location can be selected on the binding posts for the high voltage switch), and set the voltmeter at 250 V / MΩ. When the button is engaged, the voltmeter reading should be approximately 4 V when resistance of 1 MΩ is being measured. • Voltage level not appropriate: check (Z5) or (C103). • Appropriate voltage level: Remove printed circuit boards (Section C, page 13) and use an ohmmeter to determine if the circuit boards are disconnected. If disconnected, reconnect the boards. • Place the circuit board assembly upon the supporting layer and move the switch to 250 V / MΩ. Then it is necessary to connect a 1 MΩ resistor to the measuring output wires by soldering. Supply power to the boards with a voltage level of 12 V. The voltage at point T should be approximately 4 V. The output voltage for (Z6) (test point 11) should be approximately 50.7 mV. Otherwise, (Z6) is defective. The output voltage for (Z7) (test point 12) should be close to zero. Otherwise (Z7) is defective.

REV. 7: March 13, 2004 FILE LOCATION: Manuals - Cal. Man - 1000MAN.DOC 4/21/2005 MODEL 1000N REPAIR AND CALIBRATION MANUAL CAT. #185.100

Summary of Malfunctions: • Control functions begin at over voltage level between two steps on the selector switch: Leakage from (CR5), (Z4), and (CR6), towards (Z1). • Adjustment of the short-circuit current: Transformer (T1) - (Z1) not operable. • Impossible to obtain "0" on the MΩ and GΩ scales: The connecting layer has been cut at (A101), (A103), or (Z5). • Incorrect zero position for 1000 V / GΩ: The circuits are not clean, or there is insufficient protection for selector rod circuits. No contact with small protective strip: (C103) is defective. • Incorrect KΩ readings: (Z2). • Incorrect voltage readings: (R212). Unsuitable power consumption levels for printed circuit assembly (I = 100 A for 600 V point). • Defective functioning of beeper: (Z8), (Q3), beeper. • Battery light does not function: (Z2c), (CR9).

See Back of Manual for Schematics

REV. 7: March 13, 2004 FILE LOCATION: Manuals - Cal. Man - 1000MAN.DOC 4/21/2005 MODEL 1000N REPAIR AND CALIBRATION MANUAL CAT. #185.100

IX. PARTS LIST:

MAIN BOARD #679473-93

R1 3.3 K 5 % 1/4 W STANDARD 522152M00 R2 18 K 5 % 1/4 W STANDARD 521779D00 R3 1.5 K 5 % 1/4 W STANDARD 521823L00 R4 100 K 5 % 1/4 W STANDARD 521779C00 R5 18 K 5 % 1/4 W STANDARD 521779D00 R6 1 K 5 % 1/4 W STANDARD 521779H00 R7 22 K 5 % 1/4 W STANDARD 521779B00 R8 150 5 % 1/2 W CARBON 521586C00 R9 10 K 0.5% 1/8 W 50 ppm 523454E00 R10 15 K 0.5 % 1/8 W 50 ppm 524404N00 R11 24.9 K 1 % 1/8 W 50 ppm 524222Z00 R12 249 K 1 % 1/8 W 50 ppm 524068A00 R13 240 K 5 % 1/4 W STANDARD 524024A00 R14 7.5 M 5 % 1/2 W CARBON 521917Q00 R15 470 K 5 % 1/4 W STANDARD 522635F00 R16 10 M 5 % 1/4 W COMPACT 523989C00 R17 100 K 5 % 1/4 W STANDARD 521779C00 R18 150 K 1 % 1/8 W 50 ppm 523886V00 R19 100 K 1 % 1/8 W 50 ppm 523803G00 R20 100 K 5 % 1/4 W STANDARD 521779C00 R21 22 K 5 % 1/4 W STANDARD 521779B00 R22 10 5 % 1/4 W STANDARD 552152R00 R23 169 1 % 1/4 W 50 ppm 523014W00 R24 470 5 % 1/4 W STANDARD 521779G00 R25 4.7 K 5 % 1/4 W STANDARD 521779A00 R26 0.08 5 % WOUND 68 B 524542A00 R27 1 K 5 % 1/4 W STANDARD 521779H00 R28 40.2 K 1 % 1/8 W 50 ppm 523803C00 R29 100 K 5 % 1/4 W STANDARD 521779C00 R30 1 M 5 % 1/4 W STANDARD 521823Z00 R31 49.9 K 1 % 1/8 W 50 ppm 523803E00 R32 22 K 5 % 1/4 W STANDARD 521779B00 R33 1 K 5 % 1/4 W STANDARD 521779H00 R34 47 5 % 1/4 W STANDARD 522152T00 R35 47 5 % 1/4 W STANDARD 522152T00 R36 499 K 1 % 1/4 W 50 ppm 523433P00 R37 499 K 1 % 1/4 W 50 ppm 523433P00 R38 1 M 1 % 1/4 W 50 ppm 522711Y00 R39 4.02 M 1 % 1/4 W 50 ppm 523433Q00 R40 100 K 1 % 1/8 W 50 ppm 523803G00 R41 178 K 1 % 1/8 W 50 ppm 523886X00 R42 178 K 1 % 1/8 W 50 ppm 523886X00

R43 1 K 1 % 1/8 W 50 ppm 523087T00 R44 1 K 1 % 1/8 W 50 ppm 523087T00 R45 3.01 K 1 % 1/8 W 50 ppm 523014M00 R46 4.99 K 1 % 1/8 W 50 ppm 523921N00 R47 10 K 1 % 1/8 W 50 ppm 523087G00

REV. 7: March 13, 2004 FILE LOCATION: Manuals - Cal. Man - 1000MAN.DOC 4/21/2005 MODEL 1000N REPAIR AND CALIBRATION MANUAL CAT. #185.100

R43 TO R47 RESISTOR NETWORK 682636-79 R48 499 1 % 1/8 W 50 ppm 523921L00 R49 8.87 K 1 % 1/8 W 50 ppm 523128G00 R50 10 K 1 % 1/8 W 50 ppm 523087G00 R51 10 K 1 % 1/8 W 50 ppm 523087G00 R52 4.42 K 1 % 1/8 W 50 ppm 523128L00 R53 22 K 5 % 1/4 W STANDARD 521779B00 R54 100 K 5 % 1/4 W STANDARD 521779C00 R55 2.2 K 5 % 1/4 W STANDARD 521823J00 R56 10.2 1 % 1/8 W 50 ppm 523128V00 R57 59 K 1 % 1/8 W 50 ppm 523886U00 R58 2.37 K 1 % 1/8 W 50 ppm 524068E00 R59 1 K 5 % 1/4 W STANDARD 521779H00 R60 100 K 5 % 1/4 W STANDARD 521779C00

A 1 2.2 K 20 % SINGLE TURN CERMET VA 05 V 522956C00 A 2 47 20 % SINGLE TURN CERMET VA 05 V 522956P00 A 3 10 K 20 % SINGLE TURN CERMET VA 05 V 522956G00 A 4 200 K 10 % MULTITURNS CERMET 523108L00 A 5 2.2 K 20 % SINGLE TURN CERMET VA 05V 522956C00

CR 1 DIODE LM 336 Z ZENER 2.49 V 522754Z00 CR 2 DIODE 1N 4002 99-DOD 100017 CR 3 DIODE LM 336 Z ZENER 2.49 V 522754Z00 CR 4 DIODE 1N 4002 99-DOD 100017 CR 5 DIODE 1N 4148 99-DOD 100018 CR 6 DIODE BZX 55C10 ZENER 10 V 521954E00 CR 7 DIODE BZV 48C15 ZENER 15 V. 5 W 524332E00 CR 8 DIODE 1N 4148 99-DOD 100018 CR 9 DIODE GREEN LED 10 mA / 2 mcd 523175P00 CR 10 DIODE 1N 4148 99-DOD 100018 CR 11 DIODE 1N 4148 99-DOD 100018 CR 12 DIODE BAT 42 SCHOTTKY 524111C17 CR 13 DIODE 1N 4148 99-DOD 100018 CR 14 DIODE 5 PAD 50 (Added between traces) 523300V00 CR 15 DIODE 5 PAD 50 (Added between traces) 523300V00 Th1 THERMISTOR TSP 102

C1 CAPACITOR 1 F 50 V ELECTROLITIC ALU. 524401F20 C2 CAPACITOR 1 F 100 V 10 % POLY. 524121U00 C3 CAPACITOR 0.1 F 100 V 10 % POLY. 524121B20 C4 CAPACITOR 0.1 F 100 V 10 % POLY. 524121B20 C5 CAPACITOR 10 F 35 V ELECTROLITIC ALU. 524401B20 C6 CAPACITOR 10 F 35 V ELECTROLITIC ALU. 524401B20 C7 CAPACITOR 10 F 35 V ELECTROLITIC ALU. 524401B20 C8 CAPACITOR 1 F 100 V 10 % PLASTIC 524121U00 C9 CAPACITOR 100 pF 500 V 10% CERAMIC 520739N27 C10 CAPACITOR 10 F 35 V ELECTROLITIC ALU. 524401B20 C11 CAPACITOR NOT USED C12 CAPACITOR 0.22 F 160 V 10 % POLYPROPYLENE 524377A00 C13 CAPACITOR 22 nF 160 V 10 % POLYPROPYLENE 524276A00 C14 CAPACITOR 10 F 35 V ELECTROLITIC ALU. 524401B20 C15 CAPACITOR 4.7 nF 400 V 10 % POLY. 524121H20 22

REV. 7: March 13, 2004 FILE LOCATION: Manuals - Cal. Man - 1000MAN.DOC 4/21/2005 MODEL 1000N REPAIR AND CALIBRATION MANUAL CAT. #185.100

C16 CAPACITOR 0.1 F 100 V 10 % POLY. 524121B20 C17 CAPACITOR 0.1 F 100 V 10 % POLY. 524121B20 C18 CAPACITOR 1 F 50 V ELECTROLITIC ALU. 524401F20 C19 CAPACITOR 0.1 F 100 V 10 % POLY. 524121B20 C20 CAPACITOR 100 pF 500 V 10% CERAMIC 520739N20

Q 1 TRANS. TIP 31 C NPN (100V-3A) 523675S00 Q 2 TRANS. BD 520 PNP (80V-0.5A) 523739B00 Q 3 TRANS. BC 307B PNP 523015W20 Q 4 TRANS. BC 184C NPN 523206Q20

Z 1 IC. TL 495CN (Power supply control circuit) 524001F14 Z 2 IC. TL084CN (Quad. bi-FET) 524001M00 Z 3 IC. ICL7660 CPA (Voltage converter) 524165C17 *Z 4 IC. MLM 308 API 523584T17 Z 7 IC. OP07C 903.MXL 100051 Z 5 IC. ICL 7650 CPD (Chopper-amplifier) 524156G14 Z 6 IC. AD 536 AJH (RMS converter) 524280-00 *Z 7 IC. MLM 308 API 523584T17 Z 7 IC. OP07C 903.MXL 100051 Z 8 IC. ICM 7555 IPA (Timer) 523093Q00

G1 METER MOVEMENT I= 100 A FOR 97 °DEFLECTION 679433-90 T1 H.V. TRANSFORMER 3000/100 TURNS 679293-93 BZ 1 3000 HZ BEEPER (3V TO 15 V, 20 mA) 524338A00

* NOTE: Z4 and Z7 were replaced by OP07C (903.MXL 100051) Remove C9 and C20

MEASUREMENT BOARD ASSEMBLY #679298-95 R101 36.2 K 0.25 % 1/8 W 25 ppm 524996G00 R102 3.92 K 0.25 % 1/8 W 25 ppm 524986F00 R103 a 1 M 0.1 % 1/8 W 25 ppm 524986H00 R103 b 1 M 0.1 % 1/8 W 25 ppm 524986H00 R103 c 1 M 0.1 % 1/8 W 25 ppm 524986H00 R103 d 1 M 0.1 % 1/8 W 25 ppm 524986H00 R103 e 20 K 1 % 1/8 W 50 ppm 523802J00 R104 2.4 K 0.25 % 1/8 W 25 ppm 524986E00 R105 1 M 1 % 1/8 W 50 ppm 523941J00 R106 1 M 1 % 1/8 W 50 ppm 523941J00 R107 100 1 % 1/8 W 50 ppm 523839R00 R108 402 1 % 1/8 W 50 ppm 523921W00 R109 33.2 K 1 % 1/8 W 50 ppm 523839L00 R 101 TO R 109 RESISTOR NETWORK 682638-79

A101 100 K 20 % SINGLE TURN CERMET VA 05 V 522956E00 A102 22 K 20 % SINGLE TURN CERMET VA 05 V 522956D00 A 103 50 K 10 % MULTITURNS CERMET 523108J00

REV. 7: March 13, 2004 FILE LOCATION: Manuals - Cal. Man - 1000MAN.DOC 4/21/2005 MODEL 1000N REPAIR AND CALIBRATION MANUAL CAT. #185.100

C101 CAPACITOR 220 F 16 V CHEMICAL 523124B00 C102 CAPACITOR 2200 F 16 V CHEMICAL 523096K00

E101 90 V DISCHARGER 524540A00 FUSE FAST ACTION FUSE 6 * 32, 0.315 A/ 660V 100.429

HIGH VOLTAGE BOARD ASSEMBLY #679299-95

R201 100 K 5 % 1/5 W CARBON 522697P00 R202 a 2.37 M 1 % 1/8 W 50 ppm 524624D14 R202 b 2.37 M 1 % 1/8 W 50 ppm 524624D14 R202 c 2.37 M 1 % 1/8 W 50 ppm 524624D14 R202 d 2.37 M 1 % 1/8 W 50 ppm 524624D14 R203 249 K 1 % 1/8 W 50 ppm 524068A00 R204 150 K 1 % 1/8 W 50 ppm 523886V00 R205 49.9 K 1 % 1/8 W 50 ppm 523803E00 R206 10 K 1 % 1/8 W 50 ppm 523087G00 R207 15 K 0.25 % 1/8 W 25 ppm 524986K00 R208 2.4 K 0.25 % 1/8 W 50 ppm 524986E00 R209 22.6 K 0.25 % 1/8 W 50 ppm 524986J00 R210 a 3.74 M 1 % 1/8 W 50 ppm 523839J00 R210 b 3.74 M 1 % 1/8 W 50 ppm 523839J00 R21O c 3.65 M 1 % 1/8 W 50 ppm 524624B00 R 201 to R 210 RESISTOR NETWORK 682640-79

R211 100 K 5 % 1/2 W CARBON 521586L00 R212 2.67 M 0.5 % 1 W 50 ppm 523585R00 R213 294 K 1 % 1/8 W 50 ppm 523886E00 R214 47 K 5 % 1/5 W CARBON 521549U00 R215 47 K 5 % 1/5 W CARBON 521549U00 R216 100 5 % 1/2 W CARBON 520996T00

C201 CAPACITOR 0.1 F 1600V 20 % POLYESTER 523058L00 C202 CAPACITOR 1 F 250 V 20 % POLYESTER METAL 522324F00 C203 CAPACITOR 1 F 100 V 10 % PLASTIC 524121U00

CR201 DIODE BAY 25 (2000V-100 mA) 524541A00

REV. 7: March 13, 2004 FILE LOCATION: Manuals - Cal. Man - 1000MAN.DOC 4/21/2005 MODEL 1000N REPAIR AND CALIBRATION MANUAL CAT. #185.100

MECHANICAL PARTS LIST DESCRIPTION for MODEL 1000N PART # SCREW: C M3X6 524087-57 SCREW: M3X8 485503108 SCREW: C M3X25 485103325 SCREW: C M3X10 487103610 SCREW: C M4X16 485104316 LOSSPROOF SCREW: M3X8 677941-54 SIM SCREW: 0 2.84X6.4 521166D57 WASHER: 0 3.2X6X0.5 358027K57 WASHER: 0 3.2X6X0.5 358046G57 RUBBER WASHER: 0 3.7X8X1 358040D03 WASHER: 0 2.6X4.5X0.5 358018F03 WASHER: 0 6.2X12X0.5 358083D57 SPRING WASHER 320546-51 STAR WASHER: DE3 520569C40 NUT: HM3 461030157 WASHER: 0 3.2X6X1.5 358027U03 WASHER: 0 3.2X6X1 358027V57 TRUARC RING: 0 5 520099G00 POST 671850-57 POST 674333-57 POST 679451-57 INSULATING POST 679438-19 SPRING for CAP 679410-00 ASSEMBLED BATTERY COMPARTMENT 679431A73 ASSEMBLED SUPPORTING LEG 004204-40 FEET 004787-96 HIGH VOLTAGE SWITCH 679296-95 HIGH VOLTAGE BOARD 679299-95 HV SWITCH - BLACK KNOB 679435-96 MEASUREMENT BOARD 679298-95 MAIN BOARD 679473-93 MAIN BUTTON - BLACK KNOB 004156-96 ROTARY ASSEMBLY 679423-00 ROTOR 679424-18 METER MOVEMENT / GALVANOMETER 679433-90 PLASTIC PLUG - MALE 679428-19 CONNECTOR FEMALE 682789D90 SAFETY SOCKET (GREEN TERMINAL) 524385D00 SAFETY SOCKET (BLUE TERMINAL) 524385E00 PRESSURIZED BATTERY CONNECTOR 524031-00

REV. 7: March 13, 2004 FILE LOCATION: Manuals - Cal. Man - 1000MAN.DOC 4/21/2005 MODEL 1000N REPAIR AND CALIBRATION MANUAL CAT. #185.100

BATTERY HOLDER 524334-00 RING 670201-96 FLAT CABLE (connection between boards) 525090-00 FACEPLATE 686803-82B

PREVIOUS MODEL 1000 - DESCRIPTION PART # COAXIAL PLUG 522615-00 FACEPLATE 679502-90 LOCK WASHER 520569C40 RING 670201-96 SOCKET 360806-54

REV. 7: March 13, 2004 FILE LOCATION: Manuals - Cal. Man - 1000MAN.DOC 4/21/2005 MODEL 1000N REPAIR AND CALIBRATION MANUAL CAT. #185.100

VOLTAGE LEVELS AND OSCILLOGRAMS FOR PROPER OPERATION Unless otherwise indicated, all of the potentials cited herein are direct potentials measured with respect to ground. The respective oscillograms correspond to a situation where the instrument is set at the 500 V / MΩ position with +P =12 V. All bold face numbers represent test points on the schematic.

1. + 5 V ± 5% - Pin 8 of Z3 3. + 2.49 V ± 4% - Pin 1 of Z1

2. - 4.6 V ± 10% - Pin 5 of Z3 3b. - 1.65 V ± 5% - Pin 8 of Z2

4. 5. 6. 11 V 26 V

2.6 V 12 V

0 0 0

7. + 50 V to + 1000 V, according to selected 11. V (pin 4 of Z6) - V (pin 8 of Z6) range ± 5% 4 V at pin 4 ≈ - 50.7 mV at pin 8 + 1100 V ± 5% in KΩ position (1 mA) 0.571 V at pin 4 ≈ 0 V at pin 8 0.4 V at pin 4 ≈ + 9.3 mV at pin 8 8. + 2.49 V ± 4% 40 mV at pin 4 ≈ + 69.3 mV at pin 8 4 mV at pin 4 ≈ 129.3 mV at pin 8 9. + 2.49 V ± 5% if KΩ range is selected 12. V [pin 8 of Z6]-V[pin6 of Z7] 10. For any MΩor GΩ range which is - 50.7 mV at pin 8 ≈ 0 V at pin 6 selected and with a voltage level of 50 + 129.3 mV at pin 8 ≈ 1.5 V at pin 6 V to 1000 V, one should obtain at pin 10 of Z5: 13. Voltage at terminals of CR3 is 2.49 V ± 4%, Current for Ω 1 MΩ input: 4 V @ 5% measurement: 10 mA 10 MΩ input: 0.4 V @ 5% 100 MΩ input: 40 mV @ 5% 14. + 11 V except on ranges for measuring 1000 MΩ input: 4 mV @ 5% between 0 and 200 Ω: - 0.2 V

15. 16. 12 V 12 V

0 0

REV. 7: March 13, 2004 FILE LOCATION: Manuals - Cal. Man - 1000MAN.DOC 4/21/2005 MODEL 1000N REPAIR AND CALIBRATION MANUAL CAT. #185.100

MODELS 1000N/5000N POWER SUPPLY

Specifications

Open Voltage: 10 V ± 5% Output Voltage at Max Load: 9.4 V ± 5% Max Load: 350 mA Ripple: < 2% Peak to Peak Supply Variation: 110 V ± 15% or 220 V ± 15% (45 Hz to 70 Hz) Dielectrical Test: 4000 V AC 50 Hz 1mn or 6000 V DC Protected By: 1 Fuse 5 x 20 mm

Power Supply F1 T1

K1 CR1 + Q1 Power 110V R1 Rd.1 220V C1 10V/350mA CR2

Parts List R1 220Ω 1/2 W 5% 520996Z C1 1000 µF 40 V Type CMF-FP 523865G CR1 WS 005 Rectifier 50 V - 1.5 A 523017D CR2 BZX 85C 10 Diode 10 V - 1.3 W 522754G Q1 TIP 31 C NPN 523675S T1 Transformer 110 V / 220 V 679556 F1 Fuse 5 x 20mm 0.1 A / 250 V 524132U Fuse Clips 529076 K1 Sliding Switch 523892

REV. 7: March 13, 2004 FILE LOCATION: Manuals - Cal. Man - 1000MAN.DOC 4/21/2005 MODEL 1000N REPAIR AND CALIBRATION MANUAL CAT. #185.100

K1 F1

+ 2 2 CR1 Q1 CR2 C1

T1 R1

REV. 7: March 13, 2004 FILE LOCATION: Manuals - Cal. Man - 1000MAN.DOC 4/21/2005 MODEL 1000N REPAIR AND CALIBRATION MANUAL CAT. #185.100

MAIN BOARD 679473-93

A2: END OF SCALE A1: SHORT CIRCUIT ADJ. OHMETER A5: 100 MΩ ADJ.

Ð + A2 C6 C7 A1 A5 + Ð Q2 R25 R3

CR 8 R2 I J R

R23 3

R55 Z3 Q1 R CR4 R20 Q3 + Ð Z1 C5 R21 R59 CR2 + R5 R6 C8 C2 C1Ð D C 4 R22 F CR1 R1 Z8 R1

R15 R52 + Eb Ð C3

4 + E Ec Ð C4 A4: 1 MΩ ADJ. R2 A4 R41 R7 CR12 R40 R4 2 R16 R54 4 R + R57

R33 C18 9

Q4 Z7 4 R19 UV R R18 CR10 C19

R17 Z6 R48 CR11 R9 R31 R32 R58 R10

Z2 R60 8 Q

R2 R30 R51 CR8 R50 R11 R12 R34

R29 POINT D = ONE OF THE BOTTOM SCREWS ON THE HV SWITCH CR6 R53 R56 R35 SHORT CONTACT C17

C16 + C14 S + C10 A3: 0.1Ω ADJ. R27 T CR7

Z5 C13 R26 A3 R38

C13

S C12 Z4 R13 K C9 CR14 R39 K CR13 R37 CR15 CR5 R36 Y R44 R46 R45 R47 R43 NOTE: Z4 and Z7 were replaced by OP07C Remove C9 and C20

REV. 7: March 13, 2004 FILE LOCATION: Manuals - Cal. Man - 1000MAN.DOC 4/21/2005 MODEL 1000N REPAIR AND CALIBRATION MANUAL CAT. #185.100

MEASUREMENT BOARD 679298-95

C102 FUSE A103

A102

C101

R109

R103C

R103D R103B

R103A

R103E SHORT CONTACT R107 R106 R108

R104 R102 R105 R101 E101

A R101

REV. 7: March 13, 2004 FILE LOCATION: Manuals - Cal. Man - 1000MAN.DOC 4/21/2005 MODEL 1000N REPAIR AND CALIBRATION MANUAL CAT. #185.100

HV BOARD 679299-95

R216 A

CR C202 R211 201 A Short Contact

R201 Clear Wire (short)

C201

Green Wire to Green Terminal

R214

R215

Clear Wire

R213 C203

Clear Wire From Switch

R202A 8 R203 R204 R205 R206

R207

R202D R210C

R209 R20 R210A R210B R202B R202C

REV. 7: March 13, 2004 FILE LOCATION: Manuals - Cal. Man - 1000MAN.DOC 4/21/2005 MODEL 1000N MEGOHMMETER CAT. #185.100

K K1 K3 R214 R215 N 47K47K R213 R212 294K 7 K2 2.67M h R12 M 249K 9 C203 1µF R11 13 CR8 14 R9 10K 24.9K 12 Z2b R210 1N4148 l 1/4 TL 084 m R10 9 j M 8 Measurement Board Z2a R202R203 R204 R205 R206 R207 R208 R209 e 15K 10 1/4 TL 084 9.5M250K 150K 50K 10K 15K 2.4K 22.6K R204 f 100K R39 BP1 F G CR201 R7 1K S2 E2 B1-B8 A-W C C2 C3 22K S2 High Voltage Board 8 x 1.5V R2 1µF T1 C201 18K 15 12 11 8 2 3 17 16

K 0.1µF

3 4 .

R1 A1 3 Z1 TL 495 E1 S1 C102 2.2K C1 H 1mA 6 E 50V 100V 250V 500V 1000V Ω Q 3 18 75614 1910 K 2200 µF R3 1µF R8 CR2 CR1 MΩ GΩ MΩ GΩ MΩ GΩ MΩ GΩ MΩ GΩ 1.5K R211 h g LM 336 C4 R5 Ω 1N4DC2 R4 18 K R6 150 Q1 100Ω +B 1K 5 Common 100K 0.1 TIP31C C9 CR5 µF 100pF CR13 Ground Ω Ω 7 1N 4148 R216 50 100 3 C202 8 1 100Ω i 1µF MΩ Ω MΩ Ω 6 Z4 LM 308 R 4 G G 2 B-X D A1: Short Circuit 8 Current Adjustment 4

R13 2 8 + 5V 1 240K C5 Z3 C6 10µF 1CL7660 10µF 4 5 - 5V 2 3 C7 10µF Ω 50V 100V 250V 500V 1000V 1mA + P (9V to 12V) Ω Ω Ω Ω Ω Ω Ω Ω Ω M G M G M R53 M G M GΩ K 22K A2 R23 Q2 47Ω 100Ω CR4 + B BD52 R24 CR6 13 10V 470Ω + 5V + 5V + B R33 1K 1N4002 CR7 BZV +B .15V + B A2: End of Scale Ω R28 R25 S R29 CR3 R27 100K 40.2K R30 LM 336 A3 CR9 4.7K 10K R14 R16 1M R17 1K 3 4 R32 8 14 R26 1 Q4 R54 100K Ω 7.5M 10M 5 0.09 2 Z2c BC 184C 7 Z8 4 22K 7 - 5V 1/4 TL 084 R15 1CM7555 100K Z2d 6 R18 +P 11 6 + 5V R31 CR12 49.9K 470K 150K R55 2 1 1/4 TL 084 R19 C8 BAT42 R20 2.2K Ω - 5V 3 100K 100K A3: 0.1 Adjustment 1µF R21 Q3 15 BC 307B 22K R22 Main Board 16 10R Jumper *Changes on New Board (525112V00A)

I Q2 - BD 140 (80V - 1.5A) C9 - Not Used Bz1 NOTE: Z4 and Z7 were replaced by OP07C J Remove C9 and C20

REV. 7: March 13, 2004 FILE LOCATION: Manuals - Cal. Man - 1000MAN.DOC 4/21/2005 MODEL 1000N MEGOHMMETER CAT. #185.100

A4: 1 MΩ adj. (MΩ scale) R57 P 59K A4 R40R41R42 A5: 100 MΩ adj. R49 A5 Ω 200K 100K 178K 178K (M scale) C18 11 Ea Eb 1µF R34 C16 C17 8.87K 2.2K + B Rad. 1 0.1µF 0.1µF + B 47Ω T 10 3 6 R58 R36 R37 1 2.37K R48 7 9 8 R56 12 5 11 2 10 Z6 2 CR11 Z5 4 8 R52 AD536 Ω 6 1N4148 499K499K 7650 499 Z7 4 1CL 10.2Ω 3 8 5 LM30 8 4.42K 7 C15 4.7nF 9 7 12 4 G1 UV C20 R38 Th1 100pF TSP 102 BP2 (1000Ω) - 5V CR10 1M C19 1N4148 - 5V C11 C12 0.1µF 0.33 C13 R35 22nF - 5V R60 101 µF 315A . F 100K

0 47Ω C10 C14 10µF R50 R51 10µF CR14 10K 10K

R39

4.02M Y CR15 50V 100V 250V 500V 1000V 1mA Ω MΩ MΩ GΩ MΩ GΩ MΩ GΩ MΩ GΩ KΩ

Ω

50V 100V 250V 500V 1000V 1mA

MΩ GΩ MΩ GΩ MΩ GΩ MΩ GΩ MΩ GΩ KΩ

L 101

90V R43R44 R45R46R47 E

1K 1K 3K 5K 10K

R101 36.2K Measurement Board R102 R103 + 5V 3.92K 4.02M electrical shielding R104

A101 R105 R106 2.4K L A103 mounting post connection 100K 1M 1M - 5V + 5V R107 R108 50K *Changes on New Board: 100Ω 402Ω A102 A - 5V mounting wire or terminal Z4 and Z7 (OP 07C) 019S0002000000 22K C20 - Not Used R109 d a 33.2K flat cable connection A101: zero adj. for Z5 (MΩ scale) R A102: 1000 MΩ adjustment

C101 A103: zero adj. for Z5 220µF - 5V + 5V (GΩ scale) NOTE: Z4 and Z7 were replaced by OP07C

a b c Remove C9 and C20

REV. 7: March 13, 2004 FILE LOCATION: Manuals - Cal. Man - 1000MAN.DOC 4/21/2005