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Summary of Contents for Prostat CVM-780
- Page 1 CONTACT VOLTMETER CVM-780 User Manual...
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Page 3: Table Of Contents
Warranty General Specifications Copyright © 2011 by Prostat® Corporation. All rights reserved. Printed in the United States of America. No part of this manual may be used or reproduced in any manner whatsoever without written permission. For information contact Prostat Corporation, 1072 Tower Lane, Bensenville, IL 60106 USA... -
Page 4: Introduction
The CVM-780 Contact Voltmeter™ combines the ease of use of a digital voltmeter with the high input im- pedance and low input capacitance of a true electrostatic voltmeter in a small, portable, battery operated package. - Page 5 The analog output jack provides an output of 0.1 millivolt for each 1.0 volt measured by the CVM-780. The output is independent of the meter indication to maximize response time. The output is compatible with the Prostat® PGA-710 or PGA-710B Autoanalysis System™.
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Page 6: Theory Of Operation
C. At the moment of contact a small transfer of electrons occurs from the conductor to the CVM-780 tip that completes the measurement. The probe tip voltage will be well within 1. - Page 7 NOTE: DO NOT OPEN the instrument or probe assembly. There are no customer serviceable parts or ad- justments inside the instrument package or probe assembly. The CVM-780 has been in test and use for over 2 years prior to manufacture for general ESD applications. Rev. D / January 2015...
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Page 8: Receiving & Instrument Setup
V. Receiving & Instrument Setup The CVM-780 meter assembly, probe and accessories set is shipped in foam lined shipping package and includes the following items: A. CVM-780 Meter Assembly with 4 each rechargeable Metal Hydride batteries (AA size) installed during initial assembly and test. - Page 9 CVM-780 Contact Voltmeter F. Accessories box containing 1. 2 Metal probe tips, approximately 0.9 and 0.4 inches 2. 2 Ceramic probe tips, approximately 0.9 and 0.4 inches 3. Tip installation and removal tool G. Q007B ESD Grounding Cube for connecting to equipment ground in North American facilities H.
- Page 10 Manual Zero Ground Plate Front Panel Side Panel J. Before using the CVM-780 fully charge the metal hydride batteries using supplied universal battery charger. 1. Plug charger into a standard AC outlet. Use appropriate adapter if necessary. 2. Plug charger’s DC output connector firmly...
- Page 11 CVM-780 Contact Voltmeter 3. Ceramic tips are used for making direct contact with ESD sensitive parts and assemblies during precision measurements NOTE: CERAMIC TIPS ARE FRAGILE. They are brittle, and should be handled carefully to avoid damage. Tips are not covered by warranty and are costly to replace.
- Page 12 Connect the free end of the ground wire to ground using the supplied grounding block or alligator clip NOTE: the CVM-780 must be connected to an approved ground for proper operation and accurate measurements CAUTION: Avoid tangling or catching the ground wire on foreign OR MOVING objects during use CAUTION: The operator is grounded during normal operations while holding the probe assembly.
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Page 13: Making Electrostatic Voltage Measurements
CVM-780 Contact Voltmeter VI. Making Electrostatic Voltage Measurements The CVM-780 is designed to measure electrostatic voltage on conductors without discharging the object in question. When using metal probe tips, a slight voltage differential during metal to metal contact will cause low level ESD and RFI generation. When using a ceramic probe tip small ESD events and low level RFI generation are avoided. -
Page 14: Performance Characteristics & Considerations
“ground” is the instrument’s zero reference for its measurement circuit. The CVM-780 probe is “active”. Its internal components assess tip voltage as it approaches a charged conductor. It communicates with the instrument package to increase, and provide similar tip voltage upon contact with the conductor being measured. - Page 15 50 V ≤ ±2 V 10 V ≤ ±1 V This procedure confirms the ability of the CVM-780 to measure DC voltage accurately, as would be ex- pected of any good quality DC voltmeter. Variables within the error range are usually attributed to manual zeroing of the instrument to ground.
- Page 16 Consequently, if well zeroed and prop- erly grounded they should each measure the same voltage on the capacitor after contact of the CVM-780. under test. Any error would be that of operator zero adjustment and ground anomalies. Thus a 2 volt or less difference between the two voltmeters would be considered acceptable.
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Page 17: Capacitance & Accuracy
CVM-780 Contact Voltmeter Understanding these variables and the process conditions heightens the value of the operator’s measure- ments. Metal Tips Metal tips are far more robust than ceramic materials and less prone to damage. These tips are provided for general audit and analysis measurements of equipment, chairs, carts, material handling items, tools, fixtures, etc. -
Page 18: Measuring Insulators
Repeat the measurement while measuring the approximate voltage of the CPM floating plate with the CVM-780. You will see a simi- lar shift in voltage as someone else’s hand approaches, and then leaves the vicinity of CPM’s surface. -
Page 19: Instrument Maintenance
CVM-780 Contact Voltmeter 1. If the PGA-710 or PGA-710B and CVM-780 zero setting are the same measurement recordings can be made 2. If they are not the same, stop the Preview and proceed as follows. H. Adjust the CVM-780 carefully to display 000 on its LED. -
Page 20: Warranty
Limit of Liability – in no event will Prostat or any seller be responsible or liable for special, incidental, or consequential losses or damages, under any legal theory including but not limited to contract, negligence, or strict liability. -
Page 21: General Specifications
Input Impedance: ≥10 ohm in parallel with <1pF Capacitance Monitor Output: Scale Factor: 10,000:1; 100uV/V (Compatible with Prostat® PGA-710 or PGA- 710B Autoanalysis System™) Recording Deviation: Typically < ±10 volts at ± 500 Volts When measuring DC voltage reference Measurement Tolerances: 500 V ≤±5 V... - Page 22 CVM-780 Contact Voltmeter NOTES Rev. D / January 2015...
- Page 23 CVM-780 Contact Voltmeter NOTES Rev. D / January 2015...
- Page 24 CVM-780 Contact Voltmeter NOTES Rev. D / January 2015...
- Page 25 CVM-780 Contact Voltmeter NOTES Rev. D / January 2015...
- Page 26 CVM-780 Contact Voltmeter NOTES Rev. D / January 2015...
- Page 28 Specifications are subject to change without notice. All Prostat trademarks and trade names are the property of Prostat Corporation. All other trademarks and trade names are the property of their respective companies. P R O F E S S I O N A L...
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