GB1526059A - Electrometer - Google Patents

Electrometer

Info

Publication number
GB1526059A
GB1526059A GB4859675A GB4859675A GB1526059A GB 1526059 A GB1526059 A GB 1526059A GB 4859675 A GB4859675 A GB 4859675A GB 4859675 A GB4859675 A GB 4859675A GB 1526059 A GB1526059 A GB 1526059A
Authority
GB
United Kingdom
Prior art keywords
potential
meter
probe
switch
source follower
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB4859675A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Xerox Corp
Original Assignee
Xerox Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to US05/532,785 priority Critical patent/US3935531A/en
Priority to US05/532,797 priority patent/US3935532A/en
Application filed by Xerox Corp filed Critical Xerox Corp
Publication of GB1526059A publication Critical patent/GB1526059A/en
Expired legal-status Critical Current

Links

Classifications

    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R29/00Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
    • G01R29/12Measuring electrostatic fields or voltage-potential
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R29/00Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
    • G01R29/24Arrangements for measuring quantities of charge

Abstract

1526059 Measuring electrostatic potential XEROX CORP 26 Nov 1975 [16 Dec 1974 (2)] 48596/75 Heading G1U An electrostatic potential measuring system incorporates a probe 30, as described in Specification 1483366, which is referred to, and a switch 24 by which either the probe sensor 28 can be connected as shown via a terminal A to a source follower 42 and a meter 66 to display the probe potential, or in order to zeroize the circuit and correct for any drift the probe sensor 28 can be grounded via one of three terminals C which are bridged by the switch, and simultaneously the potential across the meter is fedback via an integrator A2,80 and a resistor 82 and connected, together with ground, to the input of the source follower, whereby the potential across a bias capacitor 78 between the input to the source follower and a floating battery 59 is changed to bring the potential across the meter to zero. The circuit also includes an amplifier A1 which compares a fraction of the battery voltage from a potential divider 84,86 with the voltage across a Zener 74, so that, if with the switch in position C, the battery voltage is too low, a large positive voltage is produced by the amplifier A1 causing the meter to give a positive reading rather than a zero reading as it should when the zeroizing loop is operative.
GB4859675A 1974-12-16 1975-11-26 Electrometer Expired GB1526059A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
US05/532,785 US3935531A (en) 1974-12-16 1974-12-16 Electrometer with low voltage indicator
US05/532,797 US3935532A (en) 1974-12-16 1974-12-16 Automatic zeroing electrometer

Publications (1)

Publication Number Publication Date
GB1526059A true GB1526059A (en) 1978-09-27

Family

ID=27063950

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4859675A Expired GB1526059A (en) 1974-12-16 1975-11-26 Electrometer

Country Status (2)

Country Link
GB (1) GB1526059A (en)
NL (1) NL7514349A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1996037786A1 (en) * 1995-05-26 1996-11-28 Tr-Tech Int. Oy A measuring system and a method for detecting static electricity and/or change thereof in a measuring object and use thereof

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1996037786A1 (en) * 1995-05-26 1996-11-28 Tr-Tech Int. Oy A measuring system and a method for detecting static electricity and/or change thereof in a measuring object and use thereof

Also Published As

Publication number Publication date
NL7514349A (en) 1976-02-27

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee