C-Meter Advanced ver.3
Contents
1. about 6 7 cm 2 5 3 inch Commis r En RETTET uu Roman Black 4 el amp T http fadiohobbystore com When you connect the 9V battery and power on the device the internal PCB capacitance C4 270pF will be displayed on the LCD You should adjust LCD contrast with P2 potentiometer C1 o4so4n 28282HH2 fj Roman Black If at first power up you see internal capacitance reading it s mean you are successfully finished the kit Now you ll need to do a simple calibration from next chapter of the manual before using the cap meter If not please check your soldering and refer the troubleshooting chapter Calibration Disconnect the battery Use a small screwdriver to trim the resistance of R3 P1 to exactly 10 00K ohm Measuring Capacitors Power up the capacitance meter Press zero button and connect the capacitor you need to measure The capacitance will be displayed on the LCD If the leads are shorted or a cap larger than 50uF is connected the system times out and the display will show Error and alternate between Error and Large cap as it tries to find a Cap AutCal Mode Auto zero calibrate is selected by holding the button down for 3 seconds Auto mode can be toggled on and off In auto mode it will SLOWLY trim the zero point by 0 01pF per second or so but only when there is no cap connected Auto mode is probably best for most2. cap measuring unless you need to measure very small capacitors Troubleshooting At first check twice if you install and solder all components due to components diagram You must have 5V DC reading on pin 14 of the PIC and pint 2 of the LCD It s no power up Check if you connected your power supply in proper polarity The LCD show some unreadable text or symbols Perform good connections between LCD pins Unstable connection can cause trash on the LCD display Do not touch LCD from the back side because it very sensitive to the static electricity and can be damaged I can not see any text on the LCD only backlight led is on Adjust LCD contrast with R1 potentiometer All first line of the LCD show black cubes and there is no reaction to R1 Internal oscillator is not working pic not inserted correctly Check pic orientation Try to replace 16Mhz crystal and 2x22pF capacitors You can test with frequency meter or oscilloscope at pin 16 of the microcontroller if it oscillate Use high impedance 10M scope probe Sinusoidal oscillation 16Mhz at pin 16 W M Pas ag ns ue Triangular oscillation at pin 17 about 180Khz E M250ps Technical support If some components are missing or damaged please contact us and we ll provide you a replacement If you are soldered the kit regarding the circuit and manual but it s not operate at first recheck if the right components are in right place an
3. DIY Capacitor Meter Kit Advanced Edition ver 3 00 http radiohobbystore com 7805 D1 1N4001 C1 jc ca lcs Em 1 on 100n 470uF 100pF 100n S1 5V LED1 Vee contrast RS RAN E Comparator a i R B 9V Calibration Ni 2 3 4 5 6 7 8 9 cX9L O8ZVVQGH G91 din RB1 C4 Cap under test 12 T 270p ll PIC16F628A 1K5 www radiohobbystore com u Roman Black Cap Meter Ub Cr1 R8 Zero so aa 36R 120R C6 C8 5V 22p 22p Components List Resistors R1 5 Carbon Film Resistor 1 Ohm brown black gold gold R2 1 Metal Film Resistor 3K orange black black brown brown R3 1 Metal Film Resistor 10K brown black black red brown R4 R5 R6 R7 1 Metal Film Resistor 1 5K brown green black brown brown P1 500 Ohm Trimmer Potentiometer 3362P 501 P2 20K Trimmer Potentiometer 203 Capacitors C1 C5 C7 Ceramic Capacitor 100nF 50V 104 C2 Electrolytic Capacitor 470uF 16V C3 Electrolytic Capacitor 100uF 10V C4 Axial Ceramic Capacitor 270pF NPO C6 C8 Ceramic Capacitor 22pF NPO 220 Other Manufactured Double Layer PCB 16x02 LCD Display PIC16F628A IC Socket 18 PIN 16 000 MHz Crystal 78L05 Voltage Regulator LED 3mm Red Yellow Green Color 1N4007 Diode Slide Switch Button On Off Tact Switch Push Button for Zero Terminal Block for PCB 16 Pin Female Header 16 Pin Male Header Battery Clip for 9V 2x
4. M2 5 Standoff 4x M2 5 x 6 Screws 2x Small Alligator Clips R8 36 Ohm Resistor and C11 100nF Capacitor will be included only if your display require backlight If you are not received R8 and C11 in the kit its mean your LCD can operate without backlight Some components value and type can vary For example resistors can be carbon or metal type 1N4007 can be replaced with any of 1n4001 to 1N4005 LCD color and type are depend on our stock C3 capacitor can be 100uF or 220uF Components http radiohobbystore com Technical Specification Please visit Roman Black website for more technical information and discussion http www romanblack com onesec CapMeter htm We can t supply asm file but PIC micro controller is flashed with hex file from the developer e Very High Resolution Measure from 3 to 7 digits e Wide Measure Range from 0 01pF to 47uF e Simple Calibration with a Screwdriver and Multimeter e Accuracy 1 or better e Auto zeroing Floating zero and Negative Capacitance relative to zero e Supply Voltage 8V 12V e Supply Current 12mA with no backlight LCD e Easy LCD 16x02 Installation e PCB improvements from older version On Off button e SKU RH K CM 3 Display Ranges e OpF to about 18000pF format PPPPP DD pF e 18nF to 999nF format NNN DDD nF e 1uF to 50uF format UU DDDD uF The cap meter has an advanced floating zero feature Pressing the button zeroes out any cap value that is displayed Th
5. d direction If you still cannot recognize a problem please send us support request to support radiohobbystore com Support request requirements 1 Please describe your problem attach screenshots or pictures and tell what you already tried to do for resolving the problem 2 Attach two clear focused photos of your soldered kit from both sides of the PCB Please wait up to 24 hours for the response 4 Please follow our support instruction because we can help you only if you ll work with support team If you ll not provide a information for support team we ll not be able to resolve the problem We cannot be responsible if the buyer will burn out PIC LCD or overheat the PCB pads C meter was designed to measure only discharged capacitors Please discharge capacitors before measuring If you are going to measure high voltage capacitors i e 10uF 250V or similar please use a resistor to discharge it and check with a multimeter if the any voltage remain on the pins before you ll connect it to the C Meters probes The Kit is sensitive to static electricity especially LCD board and PIC microcontroller Wrong or missing ESD protection during assembling or using the C meter can destroy it Do not touch the LCD board on the back side Use antistatic wrist strap and check if the tip of your soldering iron is grounded Copyrights Circuit and PIC software Roman Black c http romanblack com PCB design and kit distributor Alex Bog
6. der work and install right components in the right place because it always hard to desolder the parts from the PCB We cannot be responsible if you ll overheat your PCB or will damage the kit components during wrong soldering with a mistakes So please double check yourself before you solder Remember to use a solder with Rosin Core Flux Some industrial flux has several Mega ohms resistance and they require a special cleaning that cannot be performed at home Take your time to perform a solder work It can take about a hour to complete the kit Do not apply too much solder A good joint should look like Extra flux can be cleaned after with soft brush and medical alcohol We advice you to use 0 8mm or 1 00mm thickness solder wire with low melt point 60 40 186 Celsius 386 Fahrenheit 63 37 183 Celsius 361 Fahrenheit Start soldering with resistors and axial capacitor Install components as close to the PCB as it possible Cut the leads with a small flier s gt Ik hitp radiohobbyslore com 1 1 i ror ji ol pr HO osso4n 2e282nH2 f If you ll need to remove excess solder from the pad use desoldering tools braid wick or small pump Put attention to R4 resistor installed inside the IC socket You can solder IC socket after the resistor are soldered http radiohobbystore com AT gt a P H ossoan NND J ROM RER n om j D D Roman Black Se De e
7. e as DE DIRE ee se SS d oS A UD PET j Nenn P EN 3 Take note C2 470uF capacitor is installed in horizontal position Put special attention to the components direction it s critical for PIC IC diode battery clip led and electrolytic caps All possible problems comes usually from low quality of soldering short circuits or mistakes R8 resistor and C11 capacitor should be installed only in case you are received this components in package This pair of components not affect the C Meter functionality but they required for LCD backlight in case you ll use a LCD type with backlight Solder 16 pin female header to the pcb and 16 pin male header to the Icd board Install 2 M2 5 standoffs with 2 M2 5 screws for LCD board Solder battery clip wires Insert the PIC to the IC socket in right direction The finished board with all components before connecting the LCD should be looking like the next picture attached T IPs ss ag Kod gt u NY D2 03 04 05 06 D7 K une Wh wiv ussupo vo RS RW E DO DI esum ri Y RU Y T 2 http radiohobbystore com Insert LCD pins to female pcb socket Use 2x M2 5 screws for fixing the boards Check ifthere is no components touching LCD board The cap meter is ready Now you ll need to create 2 probes with alligator clips Please use a short wires for the probes something
8. e meter can be zeroed any time The meter can display negative capacitance values compared to the zero point So if you zero it on a good 1nF cap other 1nF caps tested will read as and the difference so it can be used to check cap error against a known good cap The second advanced feature is the auto calibrate mode If the button is held for 2 seconds the cap meter enables auto zero calibration Then any time when there is no test cap connected lt 3pF on test leads the cap meter will slowly trim its zero calibration by about 0 01pF every second so that it is always correctly at zero When in autocal mode it can still be zeroed by pressing the button After zeroing it may change a few counts as the components warms up With such a sensitive meter it s normal to see capacitance drift by a small amount We use in our project temperature stable NPO capacitor 270pF so there is almost no temperature drift It s normal to have small capacitance drifts with crocodile clips wires connected because the capacitance between the leads You can re zero at any time which may be necessary after moving the leads as this can make a difference of 0 10 to 0 50pF or so Of course this will not matter if you are measuring any cap larger than a few pF Assembling and Soldering Please follow our assembling and soldering instruction steps Print the circuit and pcb layout and put it in front of your eyes during the soldering Remember do the clean sol
9. uslavsky RadioHobbyStore c http radiohobbystore com If you want to create your own kits for sale please contact Roman Black You cannot use our manual text photos pictures or PCB design for producing your DIY kits
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