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GPS Time & Frequency Standard Model A8 Operation Manual A8 GPS Time & Frequency Standard OPERATION MANUAL A8 Manual A5 21 January 2005 Page 1 Model A8 Operation Manual Contents 1 Safety Considerations.......................................................................... 3 1.1 General........................................................................................ 3 1.2 Voltage, Frequency and Power Characteristics.......................... 4 1.3 Environmental Conditions ........................................................... 4 1.4 Replaceable Fusing Characteristics............................................ 5 1.5 Cleaning Instructions................................................................... 5 1.6 Outdoor Antenna Mounting ......................................................... 5 2 GPS Time & Frequency Standard A8.................................................. 6 2.1 Description................................................................................... 6 2.2 Technology.................................................................................. 7 2.3 Features & Benefits..................................................................... 7 2.4 Technical Data ............................................................................ 8 2.5 Power Supply Requirements..................................................... 11 2.6 Physical Sizes: .......................................................................... 11 3 Getting Started ................................................................................... 12 3.2 Pin Numbering, Signal Names And Signal................................ 16 3.3 Display & Menus ....................................................................... 17 3.4 Remote Signalling ..................................................................... 25 4 Warnings and Messages ................................................................... 29 4.1 What should I do when this happens? ...................................... 29 4.2 Indicator LEDs........................................................................... 34 4.3 Remote Control ......................................................................... 35 5 GLOSSARY ....................................................................................... 37 A8 Manual A5 21 January 2005 Page 2 Model A8 Operation Manual 1 Safety Considerations 1.1 General This product and related documentation must be reviewed for familiarisation before operation. If the equipment is used in a manner not specified by the manufacturer, the protection provided by the instrument may be impaired. 1.1.1 Before Applying Power Verify that the product is set to match the available line voltage and the correct fuse is installed. 1.1.2 Before Cleaning Disconnect the product from operating power before cleaning. WARNING Bodily injury or death may result from failure to heed a warning. Do not proceed beyond a warning until the indicated conditions are fully understood and met. CAUTION Damage to equipment, or incorrect measurement data, may result from failure to heed a caution. Do not proceed beyond a caution until the indicated conditions are fully understood and met. 1.1.3 This equipment must be earthed An uninterruptible safety earth ground must be maintained from the mains power source to the product’s ground circuitry. WARNING When measuring power line signals, be extremely careful and use a step down isolation transformer whose output is compatible with the input measurement capabilities of this product. The product’s front and rear panels are typically at earth ground. Thus, never try to measure AC power line signals without an isolation transformer. A8 Manual A5 21 January 2005 Page 3 Model A8 Operation Manual WARNING Instructions for adjustments when covers are removed and for servicing are for use by service-trained personnel only. To avoid dangerous electrical shock, do not perform such adjustments or servicing unless qualified to do so. WARNING Any interruption of the protective grounding conductor (inside or outside the instrument) or disconnecting of the protective earth terminal will cause a potential shock hazard that could result in personal injury. Grounding one conductor of a two conductor out-let is not sufficient protection. Whenever it is likely that the protection has been impaired, the instrument must be made inoperative and be secured against any unintended operation. If the instrument is to be energised via an autotransformer (for voltage reduction) make sure the common terminal is connected to the earthed pole terminal (neutral) of the power source. Instructions for adjustments while the covers are removed and for servicing are for use by service-trained personnel only. To avoid dangerous electrical shock, do not perform such adjustments or servicing unless qualified to do so. For continued protections against fire, replace the line fuse(s) with fuses of the same current rating and type (for example, normal blow time delay). Do not use repaired fuses of short-circuited fuse holders. 1.2 Voltage, Frequency and Power Characteristics Voltage 220-240V AC Frequency 40-50Hz Power characteristics 500mA Max 1.3 Environmental Conditions 1.3.1 Temperature Operating (ambient) -10°C to +55°C (-65 to +65 op) Storage -40°C to +85°C A8 Manual A5 21 January 2005 Page 4 Model A8 Operation Manual 1.3.2 Magnetic Field Sensitivity ≤2x10-11/ Gauss Atmospheric Pressure -60m to 4000m <1x10-13/ mbar 1.4 Replaceable Fusing Characteristics 800mA time lag HBC 1.5 Cleaning Instructions To ensure long and trouble operation, keep the unit free from dust and use care with liquids around the unit. Be careful not to spill liquids onto the unit. If the unit does get wet, turn the power off immediately and let the unit dry completely before turning it on again. Clean with a damp (with water) cloth. Never spray cleaner directly onto the unit or let liquid run into any part of it. Never use harsh or caustic products to clean the unit. 1.6 Outdoor Antenna Mounting Please ensure that all connections are sealed with self-amalgamating tape (as supplied). A8 Manual A5 21 January 2005 Page 5 Model A8 Operation Manual 2 GPS Time & Frequency Standard A8 2.1 Description Quartzlock model 8 series GPS frequency standards are microwave, satellite controlled standard frequency sources, which use the emissions of the Navstar GPS satellites to control the frequency of a crystal oscillator, a low cost SC cut OCXO, a low drift SC cut OCXO or a Rubidium Atomic Standard. These satellites all have very high quality atomic clocks on board and their emissions are monitored by all the major time-keeping laboratories in the world, including the BIPM (the International Bureau of Weights and Measures). The accuracy of the Quartzlock model 8 series is thus traceable to the highest international level. 2.1.1 Features Software weighted average of all viewed satellite carriers Stability to < 1E-12 High stability and disciplined Rubidium options 0.1, 1, 5 & 10 MHz outputs are standard 2048 kHz & 13 MHz options available Low distortion sine-wave and TTL compatible output Bench-top, Rack- mount, and Euro-cassette forms 2.1.2 Benefits International Reference BIPM / UTC Worldwide use (please notify of polar applications) High immunity to propagation errors and no ground-wave effects Portable and can advantageously replace Caesium, which has a limited tube life Much improved performance over other GPS standards A8 Manual A5 21 January 2005 Page 6 Model A8 Operation Manual 2.1.3 Applications Standards Labs; calibration of counters, timers, radio equipment and all quartz based instrumentation Telecoms synchronisation; Stratum I & IGSM, PCN base station commissioning Timescale correction to UTC, use with software clocks Time transfer Radio transmitter frequency referencing including quasi-sync systems. 2.2 Technology For the extraction of stable and accurate frequency information from the complex signal format, this receiver uses an ultra high resolution carrier phase measurement in addition to the C/A code tracking used in all normal equipment. The high precision of this carrier gives a time and frequency resolution which is as much as 10,000 times better than that which can be resolved using C/A correlation alone. The resolution is so high that the frequency of the local oscillator can be measured to 1E-10 in < 0.1 second allowing ultra precise tracking of the reference signal. 2.3 Features & Benefits Unlike most low cost GPS receivers the Quartzlock Model 8 series frequency standard receivers are able to perform extremely high-resolution carrier phase measurements for each satellite being tracked. This yields a frequency resolution, which is better than "code-only" detection by a factor of 10000. By performing carrier smoothed high-resolution code evaluation, the Model 8 is able to make range (or time) measurement of far superior precision to non-carrier, code-only detection receivers. This enables the Model 8 to detect almost instantaneously, any local oscillator frequency excursions and make fast corrections such that, even with a low cost crystal, the short-term stability is well controlled. The Model 8 is therefore unique in its price range and yields performance equal to multi-channel receivers that are unaffordable for many applications. All satellites in view are tracked and a fast time and frequency averaging is performed, minimising any errors due to any single satellite. All satellites URA's (User Range Accuracy’s) are taken into account in the course of the averaging process.
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