Section 4
TM9230A-C1-002 November, 2021
2 November, 2021
4-3
Or (Alternative Standards)
(a)
Direct Current Comparator Resistance Bridge (Acceptable Models)
Guildline Instruments 6622A Series DCC Resistance Bridge
Guildline Instruments 6675 or 6675A Series DCC Resistance Bridge
Guildline Instruments Model 9975A
(b) Guildline 6623A Series of Range Extenders from 3A through to 3000A in 150A increments
6623-100A Range Extender
(c)
Laboratory Grade Primary Resistance Standard (Acceptable Models)
Guildline Instruments 6634A Temperature Stabilized Resistance Standard
Guildline Instruments 9334A-1 Standard, 1
Ω
reference resistance standard
(d)
9230A Shunt Lead Sets (Acceptable Models for various test current levels described in Table 3)
(e)
Optional (For Automation)
Guildline 6664B/C 4-Wire, 16 Channel Low Thermal Scanner (For Automation)
(Note – the 6664C Scanner is only model capable of 1000 Volts)
Guildline Bridgeworks- Resistance Software
Guildine 9540 Digital Thermometer
4.6
Routine Calibration
This routine calibration procedure describes the calibration currents required for the 9230A Shunt
Standards. The procedure is intended to be used as a reference for qualified metrology personnel
who have a primary level standards laboratory with equipment available to support an instrument
of this level of accuracy.
Qualified personnel means that the technician or metrologist performing the calibration has the
necessary level and understanding on Direct Current Comparator Resistance Measurements and
full understanding of the DCC Bridge operation’s and will take precautions to avoid introducing
errors from sources such as guard errors, thermal emfs, temperature and or EMI errors and others.
The procedure assumes operators will make adequate allowance for equipment stabilization and
measurement settling times.
For the best uncertainties with least influence on the measurements, it is recommended that the
procedure use automation technologies such as Bridgeworks Software, IEEE control and 6664B/C
Low Thermal Scanners.
Summary of Contents for 9230A Series
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