Monroe-electronics Electrostatic Voltmeter - Isoprobe® - model 279L Manuel d'utilisateur

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100 Housel Ave PO Box 535 Lyndonville NY 14098 1-800-821-6001 585-765-2254 fax: 585-765-9330 monroe-electronics.com
INSTRUCTION MANUAL
ISOPROBE
®
ELECTROSTATIC VOLTMETER
MODEL 279L
110309
P/N 0340177
Accessories Included:
Manual
Line Cord
Probe Cover Plug
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Page 1 - INSTRUCTION MANUAL

100 Housel Ave  PO Box 535 Lyndonville NY 14098 1-800-821-6001 585-765-2254  fax: 585-765-9330 monroe-electronics.comINSTRUCTION M

Page 2 - PRODUCT WARRANTY

Page 7SECTION 4OPERATIONCAUTION:Verify that instrument operating voltage matches local power line voltage. See Section 2 and Appendix II.PRECAUTIONAR

Page 3 - MODEL 279L

Page 8SECTION 5THEORYA. General: Principle of Operation (See Figure 5-1)The electrostatic electrode "looks" at the surface under measurement

Page 4 - SECTION 1

Page 9If, however there exist voltage sources in the vicinity of the sensitive electrode which are independent of the unknown to be

Page 5

Page 10SECTION 6ADJUSTMENTA. General:The following procedure sequence is such that it will aid in troubleshooting the unit. The circu

Page 6 - SECTION 2

Page 11E. Probe Oscillator Adjustment:Connect an oscilloscope probe to TP5 and adjust R53 for a 6 Vp-p sine wave.F. Demodulator Phase Adjustment:1. Mo

Page 7 - E. Probe purging:

Page 127. Check the response to negative steps in a similar manner.8. Switch to standby. J. Noise Check:1. Replace the oscilloscope with an rms voltm

Page 8 - SECTION 3

Page 13ID Description NOTEJP1 HV TESTJP3 VM OPTionJP4 Driver linkJP6 Standard output option selectorJP7 Standard output option selectorJP8 HV JUMPER S

Page 9 - J. Probe receptacle:

Page 14SECTION 7TROUBLESHOOTINGPRECAUTIONARY NOTEModel 279 is a non-contacting voltmeter. The potential of the probe will attempt to follow the poten

Page 10 - SECTION 4

Page 15C. Detailed Troubleshooting – Initial Setup:1. Follow instructions given in Section 6-C; Initial Setup and Adjustments leaving out

Page 11 - SECTION 5

279L-0401-RCA Page 16APPENDIX IMODEL 1034 PROBE MOUNTINGThe Monroe Electronics, Inc. Model 1034 Miniature Probe is intentionally constructed with no m

Page 12 - D. Gain:

PRODUCT WARRANTYMonroe Electronics, Inc., warrants to the Owners, this instrument to be free from defects in material and workmanship

Page 13 - SECTION 6

Page 17Figure A-I-1

Page 14 - I. Speed of Response:

279L-0401-RCA Page 18APPENDIX IIPOWER ENTRY MODULEThis instrument uses a Corcom, Inc. M Series Power Entry Module that combines a power inlet, switch

Page 15 - J. Noise Check:

279L-0401-RCA Page 19Fuse changing:Figure A-II-3aEuropean fusing arrangementFigure A-II-3bNorth American fusing arrangementFigure A-II-4Fuse block/cov

Page 16 - Table 6-2

279L-0401-RCA Page 20APPENDIX IIIHV BREAKDOWN CONSIDERATIONSAir is subject to dielectric breakdown when the probe-to-surface spacing is sma

Page 17 - SECTION 7

279L-0401-RCA Page 21APPENDIX IVACHIEVING SPACING INDEPENDENCEEliminating Zero Shift Over a Large Probe-to-Surface Spacing RangeThis instrument’s basi

Page 18

iiiMODEL 279LISOPROBE® ELECTROSTATIC VOLTMETERTABLE OF CONTENTSI. SPECIFICATIONS ...

Page 19 - APPENDIX I

Page 1SECTION 1SPECIFICATIONSA. Applications:Model 279L ISOPROBE®ELECTROSTATIC VOLTMETER takes advantage of Monroe’s years of experience in

Page 20 - Figure A-I-1

Page 2I. Drift:*<0.01V/hr after 1 hr stabilization (0.003V/hr typical). Not measurably affected by 10C temperature variation or changes between 1

Page 21 - APPENDIX II

Page 3SECTION 2INSTALLATIONCAUTION:Before plugging instrument in, make certain that it is matched to local power line voltage. The f

Page 22 - 279L-0401-RCA Page 19

Page 4E. Probe purging:Probe purging improves instrument performance especially with regard to zero stability, noise and sensitivity to

Page 23 - APPENDIX III

Page 5SECTION 3CONTROLS AND INDICATORSFRONT PANEL - Figure 3-1A. STBY/OPER Switch:This push-push switch controls the operating condition of the unit.

Page 24 - APPENDIX IV

Page 6REAR PANEL - Figure 3-2G. Power Entry Module:The Power Entry Module combines power inlet, switch and fusing system. Power supply voltage is usu

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