Section 4
TM9230A-C1-002 November, 2021
2 November, 2021
4-2
Guildline offers Shunt Resistance Calibration Services, both accredited and non-accredited, from its
Smiths Falls Location. We can provide very good turn-around times with some of the lowest
uncertainties available today. 9230A Users may find the use of Guildline Calibration Services an
excellent convenience as well as a great alternative to maintaining their own calibration facilities to
support these standards.
4.4
Calibration Temperature Points
The 9230A Series of Resistance Standards are normally
calibrated at a temperature in the range of 23
°
C
±
2
°
C
with appropriate uncertainty consideration for the
temperature coefficient of the shunt. This allows the
shunt standard to be used in a calibration environment
of 23
°
C
±
2
°
C without having to calculate additional
uncertainties. The maximum temperature coefficient of
each shunt model is provided in the specifications.
Temperature coefficient measurements are usually
performed at a low power dissipation level of 1 Watt to
avoid power coefficient effects at higher levels
Where a specific temperature coefficient for a shunt
standard is required the Guildline Instruments model
5032 Temperature Controlled Air Bath (shown to the
right) is recommended to provide the best calibration
environment for such measurements. This Standard
Laboratory Grade Air Bath maintains the temperature
environment around the resistance standard to
±
0. 03
°
C of set point and also provides a highly desirable RF and EMI Shielded environment.
4.5
Equipment and Standards Required for Calibration
The following Resistance Standards and Test Equipment is required for calibration.
Complete 6625A Resistance Measurement System with 6623A High Current Range Extender capable
of meeting the highest test current requirement (See Below for Alternative Acceptable Equipment
Models)
5030 Series Laboratory Grade Temperature Air Bath for temperature coefficient measurements or
low power dissipations levels below a few watts.