CLKINSTRUMENTS - GLK Instruments
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1. MODEL 3000 DIGITAL CAPACITANCE METER Instruction and Service Manual G LKINSTRUMENTS MODEL 3000 DIGITAL CAPACITANCE METER Operation and Calibration Manual Serial Numbers This manual applies directly to instruments with serial numbers 10003 and up Serial Number For technical assistance contact GLK INSTRUMENTS Email support glkinst com Website www glkinst com Section VI VII VIII XI TABLE OF CONTENTS Warranty Product Use Restrictions Return Material Authorization Specifications Description Initial Preparation Operating Instructions Servicing Information Calibration Revisions Schematics and Parts Lists Page 10 10 WARRANTY GLK Instruments products are warranted against defects in workmanship and materials under normal use and service for one year from date of their shipment by GLK Instruments except that components ob tained from others are warranted only to the extent of the original manufacturers warranties if any This warranty does not extend to any products which have been repaired or altered by others GLK Instru ments sole liability and the Purchaser s sole remedy under this warranty is limited to repairing or replac ing defective products The repair or replacement of defective products does not extend the warranty period This warranty does not apply to components or products which by the nature of the applications are consumed in operation or which hav2. tiometer R19 for a display reading of 100 0 pF 0 1 pF Connect a high impedance voltmeter to the ANALOG OUTPUT terminals on the back of the instrument Adjust the AUX CAL potentiometer R31 for a reading of 0 1000 V 0 0001 V Calibration of the instrument is completed at this point All of the other ranges will track the calibration on the 200 0 pF range to within 0 1 Remove the standard capacitor and replace the cover The Model 3000 is now ready for use as precision instrument for the measure ment of capacitance X REVISIONS The following changes are effective for instruments with serial numbers 10004 and up Assembly 8503000 0 2 Rev 2 1 R3 REF ADJ potentiometer has been replaced with R2 labeled 5 V ADJ R2 is used to set the reference voltage at TP1 to 5 000 Vdc see Calibration section 2 Potentiometer R31 AUX CAL has been added to the analog output circuit to allow precise setting of the output voltage During calibration R31 is adjusted to set the ANALOG OUTPUT to precisely 100 00 mV see Calibration section 3 The DC power jack is 2 1 mm 4 Average battery life has been extended to about 250 hours for 9 V alkaline and 650 hours for 9 V lithium batteries XI SCHEMATICS AND PARTS LISTS This section contains the schematics and parts lists for the MODEL 3000 Digital Capacitance Meter We recommend that repairs whenever possible be performed at the factory In the event that repairs are needed in the field replac
3. PCI Probe Master Probe Master GLK Instruments Mfr Part Number RN55D3922F RN55D3922F RN55D1003F RN55D1504F EVM C7GA01B24 RN55D2001F RN55D3922F RN55D1003F RN55D1003F RN55D9090F RN55D8063F EVM CEGA01B14 RN55D1502F RN55D1003F 1776 C53 RN55D1210F RN55D3922F RN55D1003F 298J250 10M RN55D1002F RN55D1213F RN55D1001F RN55D1172F 29SJ250 100K EVM CEGA01B23 7XMTA101D9154UGR2UEE P OP 90GP MAX422CPA LF441N CD4049UBE CD4027BE CD4017BE CD4051BE CD4532B CD4069BE CD4017BE CD4017BE CD4049BE NE33PD 240 000 CX 1V 03 240 kHz CI 8403000 0 0 CH 200 001 grey 2503000 1 0 2503000 2 0 2503000 3 0 MB 10 2903 1X or equivalent 2903 1X or equivalent
4. 2 K 196 Resistor RN55D 100 K 196 Resistor RN55D 100 K 196 Resistor RN55D 909 196 Resistor RN55D 806 K 196 Potentiometer 10 K 1096 Resistor RN55D 15 0 K 196 Resistor RN55D 100 K 196 Resistor assembly 0 196 Resistor RN55D 121 196 Resistor RN55D 39 2 K 196 Resistor RN55D 100 K 196 Resistor carbon 10 M 596 Resistor RN55D 10 0 K 196 Resistor RN55D 121K 196 alternat Resistor RN55D 1 00 K 196 Resistor RN55D 11 7 K 196 Resistor carbon 100 K 596 Potentiometer 2 K 1096 Switch assembly Amplifier OP 90 Amplifier MAX422 Amplifier LF441 Logic CMOS 4049UB Logic CMOS 4027B Logic CMOS 4017B Logic CMOS 4051B Logic CMOS 4532B Logic CMOS 4069B Logic CMOS 4017B Logic CMOS 4017B Logic CMOS 4049UB Crystal 240 kHz Crystal 240 kHz alternate Printed circuit board Instrument case grey w handle Front Panel aluminum Back panel aluminum Battery cover w clip Buttons switch assembly grey 7ea Bezel LCD 4 40 pan head self tapping 16ea Probe X1 2 meter Probe X1 2 meter Manual Model 3000 Manufacturer Dale Dale Dale Dale Panasonic Dale Dale Dale Dale Dale Dale Panasonic Dale Dale Caddock Dale Dale Dale Mouser Dale Dale Dale Dale Mouser Panasonic ECG PMI Maxim National RCA RCA RCA RCA RCA RCA RCA RCA RCA NEL Statek GLK Instruments Pactec GLK Instruments GLK Instruments GLK Instruments ECG
5. PN 2110112 9 V battery instruction manual Optional Accessories Battery eliminator PN 4001200 9 V dc 50 mA 2 1 mm Plug 120 V ac 60Hz 6 W V DESCRIPTION The Model 3000 Digital Capacitance Meter is the first commercially available low cost high accuracy instrument designed exclusively for the measurement of very small value capacitors and capacitors whose size and shape are not conveniently handled by con ventional sockets clamp fixtures or alligator clip leads This instrument is particularly useful for the measurement of hybrid circuit and surface mount chip capacitors whose small size precludes the use of identifying marks The Model 3000 employs a unique patented switched capacitor circuit and a ratiomet ric measurement technique to eliminate errors due to stray capacitance to ground to provide high common mode rejection and to eliminate errors due to changes in the ref erence voltage from temperature aging etc This unique circuit allows the capacitor under measurement to be remotely connected to the meter via two miniature shielded probes without affecting the accuracy or resolution of the instrument The convenience of using miniature probes solves the costly problem of constructing special test fixtures and shielded boxes for the determination of the capacitance of a variety of objects For example the Model 3000 with its standard probes can easily de termine the capacitance between the pins of a connector th
6. of the Model 3000 with precision digital voltmeters or data acquisition systems capacitors can be measured to 0 0196 accuracy VIII SERVICING INFORMATION For service on your Model 3000 Digital Capacitance Meter contact your local GLK Instruments representative or contact the factory directly Complete repair and calibra tion services are maintained at the factory however minor repair and calibration can generally be performed in the field if you have access to a precision 3 terminal capaci tor standard IX CALIBRATION Field calibration of the Model 3000 Digital Capacitance Meter can be accomplished us ing only a single 100 00 pF 3 terminal standard capacitor such as General Radio Model 1403 D To calibrate the Model 3000 first remove the top half of the instrument case by removing the four screws located in the bottom half of the case Check the battery voltage at J2 If its voltage is below 7 V replace the battery with a new 9 V al kaline cell Turn on the instrument measure the voltage at TP1 and adjust the 5 V ADJ potentiometer R2 labeled REF ADJ R1 on assembly 8503000 0 0 to set the volt age at TP1 to 5 000 0 002 V Select the 2 000 pF range and adjust the OFFSET 9 potentiometer on the rear of the instrument to zero the display The display should read 30 001 pF after zero adjustment Select the 200 0 pF range and connect the 100 0 pF standard capacitor to the instrument using coaxial cables Adjust the CAL ADJ poten
7. 5D 1 00 K 196 Manufacturer Duracell Panasonic Panasonic Panasonic Panasonic Panasonic Panasonic Panasonic Panasonic Kemet Kemet Panasonic Panasonic Panasonic Panasonic Panasonic Kemet Kemet Kemet Panasonic Panasonic Panasonic Panasonic Diodes Inc Motorola National National National Diodes Inc Diodes Inc Shogyo Mouser Amphenol Amphenol Samtec Samtec Mouser Mouser Mouser Mouser PCI National SGS National National Dale Panasonic Dale Dale Dale Dale Dale PARTS LIST FOR ASSEMBLY 8503000 0 2 REV 02 Mfr Part Number MN1604 ECQ V1H104JZ ECQ V1H104JZ ECS F1EE106K ECQ V1H224JZ ECQ V1H105JZ ECQ V1H224JZ ECQ V1H105JZ ECQ V1H105JZ C320C102J2G5CA C320C102J2G5CA ECQ V1H104JZ ECQ V1H104JZ ECS F1EE106K ECS F1AE686 ECQ V1H104JZ CC05CG750J CC05CG220J CC05CG750J ECS F1AE686 ECQ V1H104JZ ECQ V1H104JZ ECS F1EE106K 1N4934 1N4753A LM385Z 1 2 LM385Z 1 2 LM385Z 1 2 1N4148 1N4148 SJ 200 2 1MM 12BC106 31 318 31 318 TSW 115 09 G S RA SSW 115 01 G S 530 108 0902 1 530 108 0903 1 530 108 0902 1 530 108 0903 1 PCIM 176J 2N4416A 2N2222A 2N5116 2N5116 RN55D1003F EVM CEGA01B14 RN60D49R9F RN55D7682F RN55D1003F RN55D3163F RN55D1001F PARTS LIST FOR ASSEMBLY 8503000 0 2 REV 02 Description Resistor RN55D 39 2 K 196 Resistor RN55D 39 2 K 196 Resistor RN55D 100 K 196 Resistor RN55D 1 50 M 196 Potentiometer 20 K 1096 Resistor RN55D 2 00 K 196 Resistor RN55D 39
8. D 1 00 M 1 Potentiometer 20 K 1096 Resistor RN55D 39 2 K 196 Resistor RN55D 12 7 K 196 Resistor RN55D 100 K 196 Resistor RN55D 100 K 196 Resistor RN55D 909 196 Resistor RN55D 806 K 196 Potentiometer 5 K 1096 Resistor RN55D 15 0 K 196 Resistor RN55D 100 K 196 R22 R25 Resistor assembly 0 196 BS1 7 BEZEL SCREW PROBE PROBE MAN 1 Resistor carbon 10 M 596 Resistor RN55D 68 1 K 196 Resistor RN55D 1 00 K 196 Resistor RN55D 12 4 K 196 Resistor carbon 100 K 596 Switch assembly Amplifier OP 20 Amplifier MAX422 Amplifier OP 77 alternate OP 20 Logic CMOS 4049UB Logic CMOS 4027B Logic CMOS 4017B Logic CMOS 4051B Logic CMOS 4532B Logic CMOS 40106B Logic CMOS 4017B Logic CMOS 4017B Crystal 240 00 kHz Printed circuit board Instrument case grey w handle Front Panel aluminum Back panel aluminum Battery cover w clip Buttons switch assembly grey 7ea Bezel LCD 4 40 pan head self tapping 16ea Probe X1 2 meter Probe X1 2 meter Manual operating Model 3000 Manufacturer Dale Dale Dale Dale Dale Dale Panasonic Dale Dale Dale Dale Dale Dale Panasonic Dale Dale Caddock Mouser Dale Dale Dale Mouser ECG PMI Maxim PMI RCA RCA RCA RCA RCA RCA RCA RCA NEL GLK Instruments Pactec GLK Instruments GLK Instruments GLK Instruments ECG PCI Probe Master Probe Master GLK Instruments Mfr P
9. Dae gf we ute PROTECTED BY U S PATENT Tile LAST USCO REFERENCE OCSIGNATORS NO 4896846 Hae COUUBEENEN OG Bi C19 Oii J18 Mi Q7 R38 ST Uii vi PARTS LIST FOR ASSEMBLY 8503000 0 0 REV 0 Description Battery 9 V alkaline Capacitor 0 1 mfd 50 V Capacitor 0 1 mfd 50 V Capacitor 10 mfd 25 V Capacitor 0 22 mfd 50 V Capacitor 1 0 mfd 50 V Capacitor 0 22 mfd 50 V Capacitor 1 0 mfd 50 V Capacitor 1 0 mfd 50 V Capacitor 1000 pF 50 V Capacitor 0 1 mfd 50 V Capacitor 0 1 mfd 50 V Capacitor 0 1 mfd 50 V Capacitor 10 mfd 25 V Capacitor 10 mfd 25 V Capacitor 0 1 mfd 50 V Capacitor 75 pF 50 V Capacitor 22 pF 50 V Capacitor 10 mfd 25 V Capacitor 0 1 mfd 50 V Diode 1N4934 100 PIV 1A Diode 1N4753A 36 V 1 W Diode 1N4148 Diode 1N4138 Diode 1N4138 Diode 1N4138 Voltage ref LM336 2 5 V Volt ref LM385 1 2 V Volt ref LM385 1 2 V Diode 1N4138 Diode 1N4138 Jack 2 1 mm DC power Plug 9 V battery BNC bulkhead mount crimp BNC bulkhead mount crimp Pins strip 15 terminal Sockets strip 15 terminal Jack Bananna Red Jack Bananna Black Jack Bananna Red Jack Bananna Black Meter LCD 0 200 mV Transistor FET 2N4416A Transistor 2N2222A Transistor FET 2N5116 Transistor FET 2N5116 Transistor 2N2222A Transistor 2N2907A Transistor FET 2N4416A Resistor RN55D 1 50 K 196 Resistor RN55D 10 0 K 1 select Potentiometer 5 K 1096 Manuf
10. NTS CHANGE C16 TO 22 F ANO R27 TO 121K itle u LAST USCO RCFERCNCE OCSIGNATORS PROTECTED BY U S PATENT MODEL J999 DIGITAL CAPACITANCE METER NO 4896846 Description Battery 9 V alkaline Capacitor 0 1 mfd 50 V Capacitor 0 1 mfd 50 V Capacitor 10 mfd 25 V Capacitor 0 22 mfd 50 V Capacitor 1 0 mfd 50 V Capacitor 0 22 mfd 50 V Capacitor 1 0 mfd 50 V Capacitor 1 0 mfd 50 V Capacitor 1000 pF 50 V Capacitor 1000 pF 50 V Capacitor 0 1 mfd 50 V Capacitor 0 1 mfd 50 V Capacitor 10 mfd 25 V Capacitor 68 mfd 10 V Capacitor 0 1 mfd 50 V Capacitor 75 pF 50 V Capacitor 22 pF 50 V alternate Capacitor 75 pF 50 V Capacitor 68 mfd 10 V Capacitor 0 1 mfd 50 V Capacitor 0 1 mfd 50 V Capacitor 10 mfd 25 V Diode 1N4934 100 PIV 1A Diode 1N4753A 36 V 1 W Volt ref LM385 1 2 V Volt ref LM385 1 2 V Volt ref LM385 1 2 V Diode 1N4148 Diode 1N4148 Jack 2 1 mm DC power Plug 9 V battery BNC bulkhead mount crimp BNC bulkhead mount crimp Pins strip 15 terminal Sockets strip 15 terminal Jack Bananna Red Jack Bananna Black Jack Bananna Red Jack Bananna Black Meter LCD 0 200 mV Transistor FET 2N4416A Transistor 2N2222A Transistor FET 2N5116 Transistor FET 2N5116 Resistor RN55D 100 K 196 Potentiometer 10 K 1096 Resistor RN55D 49 9 196 Resistor RN55D 76 8 K 196 Resistor RN55D 100 K 196 Resistor RN55 316 K 196 Resistor RN5
11. acturer Duracell Panasonic Panasonic Panasonic Panasonic Panasonic Panasonic Panasonic Panasonic Kemet Panasonic Panasonic Panasonic Panasonic Panasonic Panasonic Kemet Kemet Panasonic Panasonic Diodes Inc Motorola Diodes Inc Diodes Inc Diodes Inc Diodes Inc National National National Diodes Inc Diodes Inc Shogyo Mouser Amphenol Amphenol Samtec Samtec Mouser Mouser Mouser Mouser PCI National SGS National National SGS SGS National Dale Dale Panasonic Resistor RN55D 10 0 K 196 select Dale Resistor RN55D 182 K 196 Dale Mfr Part Number MN1604 ECQ V1H104JZ ECQ V1H104JZ ECS F1EE106K ECQ V1H224JZ ECQ V1H105JZ ECQ V1H224JZ ECQ V1H105JZ ECQ V1H105JZ C320C102J2G5CA ECQ V1H104JZ ECQ V1H104JZ ECQ V1H104JZ ECS F1EE106K ECS F1EE106K ECQ V1H104JZ CC05CG750J C312C220J2G5CA ECS F1EE106K ECQ V1H104JZ 1N4934 1N4753A 1N4148 1N4148 1N4148 1N4148 LM336Z 2 5 LM385Z 1 2 LM385Z 1 2 1N4148 1N4148 SJ 200 2 5MM 12BC106 31 318 31 318 TSW 115 09 G S RA SSW 115 01 G S 530 108 0902 1 530 108 0903 1 530 108 0902 1 530 108 0903 1 PCIM 176J 2N4416A 2N2222A 2N5116 2N5116 2N2222A 2N2907A 2N4416A RN55D1501F RN55D1002F EVM CEGA01B53 RN55D1002F RN55D1823F PARTS LIST FOR ASSEMBLY 8503000 0 0 REV 0 Description Resistor RN55D 365 K 196 Resistor RN55D 365 K 196 Resistor RN55D 1 00 K 196 Resistor RN55D 39 2 K 196 Resistor RN55D 39 2 K 196 Resistor RN55
12. art Number RN55D3653F RN55D3653F RN55D1001F RN55D3922F RN55D3922F RN55D1004F EVM C7GA01B24 RN55D3922F RN55D1272F RN55D1003F RN55D1003F RN55D9090F RN55D8063F EVM CEGA01B53 RN55D1502F RN55D1003F 1776 C53 29SJ250 10M RN55D6812F RN55D1001F RN55D1242F 29SJ250 100K 7XMTA101D9154UGR2UEE P OP 20GP MAX422CPA OP 77FP OP 20GP CD4049UBE CD4027BE CD4017BE CD4051BE CD4532B CD40106BE CD4017BE CD4017BE NE33PD 240 000 8403000 0 0 CH 200 001 grey 2503000 1 0 2503000 2 0 2503000 3 0 MB 10 2903 1X or equivalent 2903 1X or equivalent 52 37 RANGE SELECT EXTERNAL J1 POWER o1 1N4934 I ca os DOOK R19 LH365 1 2 cs o 1 18 25v ADJ Rer out as sa oa LH385 1 2 R16 OFFSET cio i90 ADJ i LM365 1 2 va MAx422 c12 o o 6 9 1 10 25V or cu INei46 4T 10V V NOTES 1 ALL RESISTORS ARC IN OHMS 4532 ALL CAPACITORS ARC IN MICROFARADS MER CONNECTIONS COVERS SERIAL NUMBERS UNLESS OTHERWISE INDICATED INFORMATION 91 IB SHOWN IN THE POVER ON CONOITION EC Meal ae a OM 109094 AND UP 52 37 ARC INICRLOCKED 57 IS SHOWN SELECTEO 52 5B ARC SMOWN OESELECTEO u2 u3 ASSEMBLY 8523999 2 2 REV 2 At ils provided ent te ald In repair USt ANO USF ARE NOT USCO ua U12 tien ef the MODEL 3000 DIGITAL CAPICATANCE PINS 11 ANO 13 ON U9 ARE GROUNOCO s Pyerited an et ts be us ul ur an orm Hthevt the FOR ALTERNATE CRYSTAL Yi DELETE C17 ua ure uii net GLK Inatruments SEE INEINUNE
13. d range switch is pushed 2 The range switch is a push to select interlocking assembly with only 300 gram force required to actuate any switch 3 The power switch is a push ON and push OFF type with also only 300 gram force required for actuation 4 5 Connection to the Model 3000 is via the BNC s on the front panel Normally the probes supplied with the instrument will be connected to these terminals However custom built shielded probes connectors or other special test fixtures can be con nected to these terminals without effecting the accuracy of the instrument The terminal T marked or HIGH is the positive input terminal and should be connected to the posi tive terminal of polarized capacitors Likewise the negative terminal or LOW input should be connected to the negative terminal of polarized capacitors The HIGH termi nal should always be connected to the outer foil plate or larger electrode of the ca pacitor under measurement and the LOW terminal to its other electrode to minimize noise pickup In the case of 3 terminal capacitors such as those used as standards for calibration the shield of the capacitor i e its third electrode should be connected to the ground shield of the probes An alternative is to connect a 3 terminal capacitor to the instrument using coaxial cables Although the Model 3000 has excellent common mode rejection in electrically noisy environments the capacitor under measurement may req
14. e a normal life inherently shorter than one year Examples of this are batteries components or products exposed to nuclear radiation or used in the measurement of detection of explosions GLK Instruments shall not be liable for consequential damages under any circumstances THE FOREGOING WARRANTY AND REMEDY ARE IN LIEU OF ALL OTHER REMEDIES AND ALL OTHER WARRANTIES WRITTEN OR ORAL STATUTORY EXPRESS OR IMPLIED INCLUDING ANY WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE Il PRODUCT USE RESTRICTIONS GLK Instruments does not recommend the use of any of its products or the incorporation of any of its products by second parties in their products in a life support applications where failure or malfunction of the product can be reasonably expected to cause failure of the life support device or to significantly af fect its safety or effectiveness b any nuclear facility applications which including nuclear reactors and devices designed or used in connection with the handling processing packaging preparation utilization fabricating alloying storing or disposal of fissionable material or waste products c consumer applica tions where failure or malfunction of the product can be reasonably expected to cause injury and d ap plications where failure or malfunction of the product can reasonably be expected to place the health and safety of the general public in jeopardy GLK Instruments will not knowingly sell its products f
15. e large signal gate capaci tance of power MOSFETs the capacitance between the traces on a printed circuit board or even the static capacitance of microstrip or stripline microwave circuits Us ing ultraminiature shielded probes very accurate wafer level large signal measure ments of MOS capacitors are easily obtained Miniature shielded probes are normally supplied with the instrument however the Model 3000 due to its unique circuitry can accommodate a large variety of custom built shielded probes special shielded connectors or test fixtures An offset adjust ment potentiometer is provided on the rear of the instrument to compensate for fixed capacitances up to 1 5 pF between the unshielded electrodes of custom test fixtures The Model 3000 maintains its accuracy and resolution with or without probes The Model 3000 provides auxiliary analog outputs of the meter reading and of the ref erence voltage for ratiometric measurements These outputs can be connected to digi tal voltmeters plotters data loggers computer data acquisition systems etc The Model 3000 is powered by a 9 V alkaline battery which will last approximately 200 hours An auxiliary DC power jack is provided for powering the instrument from the op tional battery eliminator PN 4001200 U S Patent No 4806846 VI INITIAL PREPARATION The Model 3000 PN 2903000 112 is supplied ready for use with a battery two probes and probe accessories The 9 V batt
16. ement parts can be obtained from GLK Instruments When ordering replacement parts refer to the parts list for that instrument and specify the circuit number Ckt No description and manufac tures part number For instruments with serial numbers up to 10003 use parts list for assembly 8503000 0 0 Rev 0 For instruments with serial numbers 10004 and up use parts list for assembly 8503000 0 2 Rev 2 glk0193 10 2 57 RANGE SELECT EXTERNAL Ji POKER c3 10 2 v 37 R27 39 12 4 AUX REF out J6 X H gt s2 a ES E ec as 200 onr OFFSET ALT OP20 ADJ 2 as Ln385 1 2 a 2N2222A uz 2 MhX422 ge 19 25V ena 2N29e7AR 1e725v ananena Pr war S lt Zy ooo DONDA DUN a o o NOTES 1 ALL RESISTORS ARE IN DMMS COVERS SERIAL NUMBERS ALL CAPACITORS ARE IN MICROFARADS UNLESS OTHERWISE INDICATCO UEM CONNECTIONS UP TO 12003 1 IS SHOWN IN THE POWER ON CONOITION 2 37 ARE INTCRLOCKED 57 IS SHOWN SCLECTEO au ASSEMBLY 85030900 0 2O REV 2 5 ARE SHOWN DESELECTEO T ecuvment is provided aniy te aid a libration ef the MODEL 3000 DIGITAL CAPICATANCE USC USO USE AND UPF ARE NOT U METER This dece 16 cepyurited and is not te be SEO PINS 3 9 11 AND 13 ON U9 ARE GROUNOLO duplicated er repr In any form withevt the express written permission of GLK Instruments ALTERNATE IF LM335 5 8 I3 USCO REMOVE RB REMOVE JUMPERS AT D4 AND DS ANO INSERT u6 UT GLK INSTRUMENTS ees
17. ery however is not installed To install the battery open the battery compartment cover on the rear of the instrument and con nect the 9 V battery to the polarized snap lead If the instrument is to be stored for an extended period remove the battery to prevent leakage damage khkkkkkkkkkkkkkkkkkkkkkkkkkkkkkk ALWAYS DISCONNECT THE BATTERY ELIMINATOR AND ANY TEST FIXTURES OR PROBES FROM THE INSTRUMENT WHEN REPLACING THE BATTERY kkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkk The instrument is now ready for use however it is recommended to perform the follow ing initial checkout to become more familiar with the instrument before use Select the 2 000 pF range by depressing the respective front panel switch Turn on the instrument by pressing the ON switch The LCD display should appear and settle to a stable reading of 0 001 within a few seconds The instrument was adjusted at the fac tory to read 0 001 pF If the display is not within 0 001 pF then adjust the OFFSET potentiometer on the rear of the instrument Now unpack the two probes are fully and connect each probe to the front panel BNC connectors Hold probes about 6 inches apart and observe the display The display should read 0 001 pF provided the probes are held stationary Hold the probes tips approximately 1 8 inch apart You should ob serve a reading of approximately 0 030 pF or 30 femto farads Place the probes at least 6 inches apart again and check the ze
18. ging to compo nent replacement or to operation at elevated temperatures 7 The 9 V battery is housed in a compartment on the rear of the instrument The Model 3000 will operate for approximately 200 hours on a 9 V alkaline battery 8 8 The auxiliary DC power jack provides the capability of operating the instrument con tinuously from an external power source such as the optional battery eliminator PN 4001200 The internal 9 V battery is disconnected when the battery eliminator is connected 9 The analog output provides a 0 200 mV dc signal proportional to the capacitor un der measurement and also to the instrument s internal reference voltage The source resistance is 1000 ohms 10 The instrument s internal 5 000 V dc reference voltage is available at the reference output jacks Its source resistance is 1000 ohms The reference output voltage is used to provide external ratiometric capability to remove errors in the analog output signal due to changes in the reference voltage from temperature and long term drift The ref erence output is connected to the external reference input on digital voltmeters data loggers etc which provide for this option Alternatively errors from variations in the reference voltage can be removed from the analog output signal by calculating the ratio of analog output to reference output and multiplying by the appropriate scale factor from separate measurements of each voltage Using the external outputs
19. or use in such applications unless GLK Instruments receives in writing satisfactory assurances that a the risks of injury or damage have been minimized b the customer assumes all such risks and c the liability of GLK Instruments is adequately protected under the circumstances Ill RETURN MATERIAL AUTHORIZATION In the unlikely event that any of the products of GLK Instruments need repair contact GLK Instruments for a return material authorization RMA number IV SPECIFICATIONS 25 C unless specified otherwise Electrical Capacitance range Resolution Display Accuracy with or without probes Measurement frequencies Offset adjustment Signal output voltage Source resistance Reference output voltage Source resistance Battery Auxiliary power Environmental Operating Temperature Storage Temperature Operating relative humidity Mechanical Package Dimensions Weight Accessories Supplied 2 000 pF to 200 0 nF 0 001 pF to 0 1 nF 3 1 2 digit LCD 0 1 of rdg 2 digits 24 kHz 2 pF 20 pF 200 pF 2 nF 2 4 kHz 20 nF 240 Hz 200 nF 1 5 pF 0 200 mV dc 1000 ohms 1 5 000 V dc 1000 ohms 1 9 V alkaline NEDA 1604A 7 28 V dc 50 mA supply with 2 1 mm DC power jack 0 C to 50 C 20 C to 70 C 80 noncondensing Bench top portable instrument case with handle 8 50 x 9 52 x2 44 inches 2 Ibs Two miniature shielded probes and probe accessories
20. ro on the other ranges by depressing each range switch while observing the display Next measure the 100 pF chip capacitor sup plied with the instrument First select the 200 0 pF range second touch each of the metalized ends of the chip capacitor with the probes and third read the display kkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkikikk CAUTION ALWAYS DISCHARGE HIGH VOLTAGE CAPACITORS BEFORE MEASURING TO AVOID DAMAGE TO INSTRUMENT kkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkik You should now be familiar with the general use of the Model 3000 Digital Capacitance Meter For a more detailed discussion of the operation of the Model 3000 refer to the following section Vil OPERATING INSTRUCTIONS A detailed description of the operation of each function of the instrument is given in this section The basic functions of the Model 3000 are listed below Front Panel 1 Display 3 1 2 digit LCD 2 Range switch 2 000 pF to 200 0 nF push to select 3 Power switch push ON push OFF 4 Cx HIGH input BNC positive connection 5 Cx LOW input BNC negative connection Rear panel 6 OFFSET potentiometer 7 9V battery compartment 8 Auxiliary DC power jack 9 Analog output jacks O 200 mV dc 10 Reference voltage output jacks 5 000 V dc 1 The display is a self contained 3 1 2 digit LCD digital voltmeter with polarity and decimal point indication The decimal point is automatically selected when the desire
21. uire shielding to obtain a sta ble reading To maintain accuracy and low noise readings connect the shielding to both probe shields All capacitors but specifically high voltage high capacitance capacitors must be dis charged first before measurement to avoid damage to the instrument The Model 3000 uses a combination of CMOS and JFET devices to drive and sense the capacitor under measurement consequently voltage transients can damage these devices which will cause the instrument to malfunction kkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkik DISCHARGE ALL CAPACITORS BEFORE MEASUREMENT TO PREVENT DAMAGE TO THE INSTRUMENT AND TO PREVENT PERSONAL INJURY kkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkk The drive level which is presented to the capacitor under measurement from the HIGH connection is 5 0 V peak with respect to the shield and is current limited to 5 mA Thus a wide range of capacitors with breakdown voltages as low as 5 V can be mea sured with the Model 3000 without damage to the capacitor under measurement 6 The OFFSET potentiometer located on the rear of the instrument is used primarily to compensate for the capacitance between the unshielded terminals of test fixtures used to measure axial and radial leaded capacitors The OFFSET potentiometer can subtract up to 1 5 pF of test fixture capacitance The OFFSET potentiometer is used also to zero the instrument which may be required due to component a
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