Monroe-electronics Electrostatic Voltmeter - Isoprobe® - model 279L Bedienungsanleitung

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

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

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

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

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

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

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

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

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

Page 17Figure A-I-1

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

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

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

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

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

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

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

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

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

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