R2D2 ESR-LCR METER DESCRIPTION. The device is designed for measuring low resistance, inductance, capacitance and ESR of capacitors. Functionally, the circuit can be divided into eight modules: 1. L / C oscillator !"#$%&"#'%2. Block stable. current sources (50mA/5mA/0.5mA) !"#$%&"#'%3. Unit responsible ($)*+,-+,.)+% for */0 the 1-2)$)+10 discharge 2,/34 of "%($%#1'/)+1& the capacitor, 1+*56#1'+%"#1 test , )26%"#1 1 789 6%+*)+",#%$%'. :5+6;1%+,/<+%, "4)25 2%=+% $,->1#< +, 8 %"+%'+34 2%*5/)&: 4. Block1. L/C voltage ?)+)$,#%$ amplifier 5. Block2. @/%6 display 1"#%.+16%' (Nokia "#,>1/<+%?% LCD 3310)#%6, (50mA/5mA/0.5mA) 3. @/%6, %#').,AB1& -, $,-$0* 1"(3#5)2%?% 6%+*)+",#%$, 6. control4. @/%6 buttons 5"1/1#)/)& +,($0=)+10 7. PIC18F25205. @/%6 %#%>$,=)+10 microcontroller 1+C%$2,;11 (Nokia LCD 3310) 6. D+%(61 5($,'/)+10 8. Switch7. E16$%6%+#$%//)$ (for switching PIC18F2520 components of the subjects) 8. 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H,/)) the, (%*6/A.)++3&capacitor stable 6 '34%*5 current F! 216$%6%+#$%//)$ source to $)?1"#$1$5)#a certain (16level 12(5/<", of voltage 1 '3(%/+0)# (0,2 ,+,/%?% v) with-;1C$%'%) a parallel ($)%>$,-%',+1)counting the */0charging *,/<+)&G)?% time. $,".)#, The scheme ')/1.1+3 is+,($0=)+10 implemented. N+,0 -+,.)+1) seq. way. "1/3 Capacitor #%6, 12(5/<", connected 1 +,($0=)+1) subject, ($%1-'%*1#"0 pre- $,".)# ESR. 8$1 1-2)$)+11 ESR 2,/34 )26%"#)& (<10uF) ($%1"4%*1# +)-+,.1#)/<+%) -,'3G)+1) (%6,-,+1& 1-2)$1#)/0. M) "2%#$0 +, #%, .#% */1#)/<+%"#< 12(5/<", '")?% 1-2uS J#%?% *%"#,#%.+% */0 #%?%, .#%>3 6%+*)+",#%$ 5"()/ +)2+%?% -,$0*1#<"0, #)2 ",232 "/)?6, -,'3"1' -+,.)+1) 1-2)$0)2%?% +,($0=)+10. ()#*+, -%."#$/-0,,. M)6%#%$3) %"%>)++%"#1 6%+"#$56;11 6%#%$3) "/)*5)# 5.)"#< ($1 (%'#%$)+11. 8%*"#$%).+3) $)-1"#%$3 ' >/%6) 1"#%.+16, "#,>1/<+%?% #%6, (2. I_source) /5.G) -,2)+1#< +, (%"#%0++3), (%"/) (%*>%$, 14 ($12)$+%?% -+,.)+10 ' ($%;)"") +,"#$%&61 (%(1",+% +1=)). 8%*"#$%).+3) $)-1"#%$3 R3 1 R8 ' >/%6) 5"1/1#)/0 (4. Amp) $)6%2)+*5)#"0 1"(%/<-%',#< 2+%?%%>%$%#+3). 7#% (%-'%/1# '3(%/+1#< #%.+5A (%*"#$%&65 6%JC. 5"1/)+10 %# -+,.)+10 6%#%$%?% -,'1"1# #%.+%"#< $,>%#3 ($1>%$, (%"%>)++% 6$1#1.+% */0 ESR). L2)"#% *'54 F! MCP601 2%=+% 1"(%/<-%',#< %*+5 MCP602. O)/) ' >/%6) 6%225#,;11 (8. Switch) +)%>4%*12% 1"(%/<-%',#< >1"#,>1/<+%) " *'520 %>2%#6,21 $,"".1#,++321 +, +,($0=)+1) 5v. discharge (Q1) and then fed it to a stable voltage and the timer countdown. At the moment of reaching the voltage level of 0,2 v. triggers an internal comparator and a fixed timer. Next is the capacitance calculation. To reduce the measurement time you can select the maximum limit of measuring the capacitance of the test capacitor (100/300/600 thousands of microfarads). Measurement of ESR (ESR) capacitor and the measurement of low resistances is performed by ff. principle. On the subject capacitor short voltage pulse is applied formed a stable source of supply. This causes a spike in voltage magnitude is proportional to the ESR of the capacitor. Two series- connected DU increase the signal to the required level. Further, connected to the output of op amp microcontroller registers peak of the pulse and performs the analog-digital transformation for further calculation of voltage. Knowing the value of the current pulse and the voltage produced calculation of ESR. When measuring the ESR of small vessels (<10uF) is a slight overstatement of meter readings. Despite the fact that pulse duration of 1-2uS enough to recharge the capacitor had a little, thus slightly overestimated the value of the measured voltage. Construction details. Some design features that should be considered when repeated. Trimmer to block the source stable current (2. I_source) should be replaced by the constant, after selecting their approximate value in the configuration process (Described below). Trimmer resistors R3 and R8 in the amplifier unit (4. Amp) is recommended to use multi. This will allow fine-tuning of the coefficients. enhance the value of which depends on the accuracy of the instrument (especially critical for ESR). Instead of two MCP601 op amp can be used one MCP602. Relay in switching unit (8. Switch) must be used bistable with two windings rated for 5v. Capacitors C2 and C5-polar tantalum or "pottery." Choke L1 - such as "dumbbells". Even better, if the "dumbbells" will be in the ferrite "glass". Block "S1 optional" is the control unit supply voltage on the LC oscillator. Optionally, there is a possibility turn off the generator in the measurement mode "elektorlitov" scheme to reduce power consumption. S1 unit can not use, simply plug the generator to the LC diet. ! To avoid failure of the microcontroller, Jmp jumper should be set only after the voltage setting in point "B" resistor "R_Vbat" (described below). The circuit module is missing frequency (prescaler and buffer), although the software itself is implemented frequency. Measured frequency (with the "correct" amplitude) must be submitted by 6 output MK (F). It should be understood that for modes measuring capacitance and inductance at input 6 MK must be supplied from the output signal LC oscillator. With this purpose in the scheme shows the switch. One of the possible solutions of the schematic module frequency (prescaler / buffer switching) is still under development. If necessary, switching can be arranged on the common switches, as well as diagrams of the input circuits (divider \ buffer) using one of the many schemes available in Internet. Setting up and operating the device. When you first turn on the device should reset all settings to default. To do this, press 3 and power on the device. Later this operation can be done from the menu «Function» section "Reset". After reset it is desirable to produce off-ON device. By default, after reset the contrast value «Contrast» set as 200. You can change the settings menu, or perform off-ON device holding the 4 pressed. In this case, immediately after the device goes into the menu adjust the contrast. Next button 4 contrast is increased, and button 3 - is reduced. !"#$%#&'(")* +2 , +5 ('#('-".*% ,-, #%/"-0)#'0 “1%)'2,1'”. 3)"&&%-4 L1 – (,/' “5'#(%-41'”. 67% -89:%, %&-, ;(' “5'#(%-41'” <8$%( . =%)),("."2 “&('1'#%”. >-"1 “S1 optional” ;(" <-"1 8/)'.-%#,0 /"$'9%? #'/)0@%#,0 /,('#,0 #' LC 5%#%)'("). A/B,"#'-4#", &87%&(.8%( ."C2"@#"&(4 "(1-D9'(4 5%#%)'(") . )%@,2% ,C2%)%#,0 “;-%1(")-,(".” $-0 &#,@%#,0 ;#%)5"/"()%<-%#,0 &E%2*. >-"1 S1 2"@#" #% ,&/"-4C".'(4, /)"&(" /"$1-D9,. LC 5%#%)'(") 1 /,('#,D. !!! F" ,C<%@'#,% .*E"$' ,C &()"0 2,1)"1"#()"--%)', /%)%2*918 Jmp &-%$8%( 8&('#'.-,.'(4 ("-41" /"&-% #'&()"?1, #'/)0@%#,0 . ("91% “B” )%C,&(")"2 “R_Vbat” ("/,&'#" #,@%). F &E%2% "(&8(&(.8%( 2"$8-4 9'&("("2%)' (/)%$$%-,(%-4 , <8=%)) E"(0 /)"5)'22#" &'2 9'&("("2%) )%'-,C".'#. GC2%)0%28D 9'&("(8 (& «/)'.,-4#"?» '2/-,(8$"?) &-%$8%( /"$'.'(4 #' 6 .*."$ MK (F). H%"<E"$,2" /"#,2'(4, 9(" $-0 )'<"(* )%@,2". ,C2%),(%-0 %21"&(, , ,#$81(,.#"&(, #' .E"$ 6 MK $"-@%# /"$'.'(4&0 &,5#'- & .*E"$' LC 5%#%)'(")'.