Section 4
TM9230A-C1-002 November, 2021
2 November, 2021
4-6
4.7
Calibration Procedure
Record information as required into Table 3 (Calibration Data Worksheet)
(a)
Allow 9230A to stabilize for at least 24 hours at calibration temperature (including air or flowing
oil baths).
(b)
Connect leads capable of handling the maximum required current from the 9230A Current
Terminals to the range extender output current terminals.
(c)
Connect the Bridge Rs terminals to the appropriate standard terminals, (4 wire connection).
(d)
Connect the Bridge Rx potential terminals to the Potential Terminals of the shunt to be
measured.
(e)
Setup DCC Bridge and Range Extender and other standards used for appropriate measurement
(refer to manuals for equipment being used). Determine if calibration is to be preformed with
natural convection or if the 92310 forced air unit is required.
(f)
Starting with the lowest Test Point Current (Point 1 of datasheet), apply current and run
recommended number of samples per Bridge Manual recommended measurement samples.
(g)
Record results for test (value) point 1 on Calibration Data Worksheet.
(h)
Repeat steps b through f for test point 2 and test point 3.
(i)
Remove all test leads and make sure standards are powered down.
(j)
Calculate drift and determine if within specification per Worksheet.
Note: Measurement Tips.
Consider the following when setting up the measurement
Verify that the max current applied in the measurement will not exceed the specs for the UUT or the STD.
In no case should you exceed 130 watt level of applied power.
Verify the reversal rate is appropriate for the measurement and the uncertainty desired.
Ensure that you know whether the measurement you are reading on the bridge is either a ratio or actual
ohms value.
If using a PC, verify that the number of samples and logging delay are appropriate.
If using a PC set the environmental parameters in BridgeWorks .
Verify guard and ground connections (see 6622A Manual).
If using a scanner, ensure that the proper channels for Rx and Rs are selected.
Summary of Contents for 9230A Series
Page 2: ......
