GB2427281A - Reference resistances for calibrating resistance meters - Google Patents

Reference resistances for calibrating resistance meters Download PDF

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Publication number
GB2427281A
GB2427281A GB0512350A GB0512350A GB2427281A GB 2427281 A GB2427281 A GB 2427281A GB 0512350 A GB0512350 A GB 0512350A GB 0512350 A GB0512350 A GB 0512350A GB 2427281 A GB2427281 A GB 2427281A
Authority
GB
United Kingdom
Prior art keywords
ohms
resistor
resistors
socket
electrical tester
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.)
Withdrawn
Application number
GB0512350A
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GB0512350D0 (en
Inventor
Ian Foster
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.)
Individual
Original Assignee
Individual
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
Application filed by Individual filed Critical Individual
Priority to GB0512350A priority Critical patent/GB2427281A/en
Publication of GB0512350D0 publication Critical patent/GB0512350D0/en
Publication of GB2427281A publication Critical patent/GB2427281A/en
Withdrawn legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
    • G01R35/005—Calibrating; Standards or reference devices, e.g. voltage or resistance standards, "golden" references
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
    • G01R35/005—Calibrating; Standards or reference devices, e.g. voltage or resistance standards, "golden" references
    • G01R35/007—Standards or reference devices, e.g. voltage or resistance standards, "golden references"

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Measurement Of Resistance Or Impedance (AREA)

Abstract

The invention comprises a set of standard reference resistances for calibrating ohmmeters/resistance meters (or multimeters having resistance function). The invention relates to an electrical tester 1 comprising a housing 2 supporting a plurality of resistors each of a predetermined value. Preferably nine resistors are provided having a value of 50M ohms, 20M ohms, 10M ohms, 2M ohms, 0.5M ohms, 10 ohms, 2 ohms, 1 ohms, and 0.5 ohms. Contacts 3 and 10,11,12,13, 14,15,16,17,18 are provided to connect a pair of probes 4A,4B of a resistance measuring meter 5 across each resistor whereby the resistance value measured by the meter can be compared to the actual value of each resistor.

Description

Title: Electrical Meter Tester The present invention relates to an
electrical tester, especially for resistance measuring devices used by electricians.
Many electricians use measuring devices such as meters to measure resistance, e.g. to check insulation of wires and check for short circuits in circuits and the like. Such meters usually have two electrically-conductive contact probes which are connected across a circuit whose resistance needs to be measured. It is often a requirement that such meters are calibrated regularly (e.g. annually) by checking that the resistance value reading by the meter is in fact correct. To do this the meter needs to be given to a test station which is expensive and the meter is not usable for a few days.
The invention seeks to provide an electrical tester for such measuring devices.
According to the present invention there is provided an electrical tester comprising a housing supporting a plurality of resistors each of a predetermined value, and contacts to connect a pair of probes of a resistance measuring meter across each resistor whereby the resistance value measured by the meter can be compared to the actual value of each resistor.
Preferably the tester comprises nine resistors. Preferably the nine resistors have a value of 50M ohms, 20M ohms, IOM ohms, 2M ohms, 0.5M ohms, 10 ohms, 2 ohms, I ohms, and 0.5 ohms.
Preferably each resistor is connected across a socket unique to a resistor and a common socket.
Preferably each resistor can carry a voltage of I000V DC.
Preferably the resistors are mounted on a circuit board, and the circuit board is soldered to terminals on the sockets.
Each resistor may be formed of two or more "sub-resistors" wired in series and/or parallel.
An embodiment of the invention will now be described with reference to the accompanying drawings in which: Figure 1 shows a perspective view of an electrical tester, and Figure 2 shows a circuit used in the tester.
Referring to Figure 1 there is shown a tester 1.
Tester 1 has a rectangular box housing 2 which may be formed of plastics.
Mounted on a front face of housing 2 are ten sockets. Socket 3 is a common socket adapted to receive one probe 4A of a resistance measuring meter 5. Sockets 10,1 1,12,13, 14,15,16,17,18 are adapted to receive a second probe 4B of meter 5.
As shown in Figure 2, between socket 3 and socket 10 is a 0.5 ohm resistor. Between socket 3 and socket 11 is a 1 ohm resistor. Between socket 3 and socket 11 is a 1 ohm resistor. Between socket 3 and socket 12 is a 2 ohm resistor. Between socket 3 and socket 13 is a 10 ohm resistor.
Between socket 3 and socket 14 is a.5M ohm resistor. Between socket 3 and socket 15 is a 2M ohm resistor. Between socket 3 and socket 16 is a I OM ohm resistor. Between socket 3 and socket 17 is a 20M ohm resistor. Between socket 3 and socket 18 is a 50M ohm resistor. Each resistor can carry a voltage of I 000V DC.
In practice each resistor may be made up by wiring in parallel andlor series a number of "sub- resistors" in order to create a resistor of the required value which can carry the voltage. For example as shown the 50M ohm resistor is made up of five I OM ohm resistors in series.
In use the probes 4A,4B of meter 5 can be placed across each resistor whereby the resistance value measured by the meter can be compared to the actual value of each resistor. If the value varies by more than a predetermined amount (e.g. +1- 5%), the meter can be taken to a specialist for calibration.
In fabricating the tester, the resistors are mounted on a circuit board, and the circuit board can be soldered to end terminals on the sockets 3 and 10 to 18 inside the housing 2.
The invention may take a form different to that specifically described above.
Further modifications will be apparent to those skilled in the art without departing from the scope of the present invention.

Claims (8)

1. An electrical tester comprising a housing supporting a plurality of resistors each of a predetermined value, and contacts to connect a pair of probes of a resistance measuring meter across each resistor whereby the resistance value measured by the meter can be compared to the actual value of each resistor.
2. An electrical tester according to claim I, wherein the tester comprises nine resistors.
3. An electrical tester according to claim 2, wherein the nine resistors have a value of 50M ohms, 20M ohms, 1OM ohms, 2M ohms, 0.5M ohms, 10 ohms, 2 ohms, I ohms, and 0.5 ohms.
4. An electrical tester according to any preceding claim, wherein each resistor is connected across a socket unique to a resistor and a common socket.
5. An electrical tester according to any preceding claim, wherein each resistor can carry a voltage of I000V DC.
6. An electrical tester according to claim 4, wherein the resistors are mounted on a circuit board, and the circuit board is soldered to terminals on the sockets.
7. An electrical tester according to any preceding claim, wherein each resistor may be formed of two or more "sub-resistors" wired in series andlor parallel.
8. An electrical tester substantially as hereinbefore described with reference to and as shown in the accompanying drawings.
GB0512350A 2005-06-17 2005-06-17 Reference resistances for calibrating resistance meters Withdrawn GB2427281A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB0512350A GB2427281A (en) 2005-06-17 2005-06-17 Reference resistances for calibrating resistance meters

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB0512350A GB2427281A (en) 2005-06-17 2005-06-17 Reference resistances for calibrating resistance meters

Publications (2)

Publication Number Publication Date
GB0512350D0 GB0512350D0 (en) 2005-07-27
GB2427281A true GB2427281A (en) 2006-12-20

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
GB0512350A Withdrawn GB2427281A (en) 2005-06-17 2005-06-17 Reference resistances for calibrating resistance meters

Country Status (1)

Country Link
GB (1) GB2427281A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104714202A (en) * 2013-12-13 2015-06-17 旺矽科技股份有限公司 Correction sheet

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2200466A (en) * 1987-01-29 1988-08-03 Fluke Mfg Co John Calibrating an electrical calibrator
SU1601588A1 (en) * 1988-11-28 1990-10-23 Кишиневский Научно-Исследовательский Институт Электроприборостроения Resistive divider of constant voltage
GB2301501A (en) * 1994-03-02 1996-12-04 Ind Res Ltd A resistance network

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2200466A (en) * 1987-01-29 1988-08-03 Fluke Mfg Co John Calibrating an electrical calibrator
SU1601588A1 (en) * 1988-11-28 1990-10-23 Кишиневский Научно-Исследовательский Институт Электроприборостроения Resistive divider of constant voltage
GB2301501A (en) * 1994-03-02 1996-12-04 Ind Res Ltd A resistance network

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
GlobalSpec, About Resistance Standards and Decades downloaded from: http://test-equipment.globalspec.com/LearnMore/Test_Measurement_Equipment/Calibration_Instruments_Standards_Reference_Sources/Resistance_Standards_Decades, 23rd August 2006. *
IET Labs, High Accuracy Standard Resistance and Standard Resistance Reference or Working Standards, downloaded from: http://www.ietlabs.com/pdf/Datasheets/SRL.pdf and http://www.ietlabs.com/pdf/Datasheets/SRX,SRA,SRC.pdf, 23rd August 2006. *
Introducing the SmartResistor an Automated Resistance Standard, downloaded from: http://www.smartresistor.com/, 23rd August 2006. *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104714202A (en) * 2013-12-13 2015-06-17 旺矽科技股份有限公司 Correction sheet

Also Published As

Publication number Publication date
GB0512350D0 (en) 2005-07-27

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WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)