Section 4
TM9211B-A-00
6 November 2013
4-10
4.7
Optional Calibration Procedure (Drift Verification)
4.7.1
Calibration of 300 A (0.333 333 m ) Range
(a) Record the last calibration date and previous values for each range on Table 5. The last
calibration date is used to determine if the unit has met 1 year specifications.
(b)
Allow the 9211B to stabilize at Calibration environment for a 24 hour period. Ensure that the
room is properly ventilated to dissipate heat up to 30 W of power for the calibration process.
(c)
Setup DCC Bridge and Range Extender and other standards used for appropriate measurement
(refer to Standards Manuals used).
(d)
Connect leads capable of handling 300 A to the 9211B Input Common (Right side) and the 300 A
Terminals to the range extender output high and low.
(e)
Connect the Bridge Rx terminals to the UUT Common and Potential Terminals on the left side (4
to 2 wire connection).
(f)
Set the two range plugs to the 300 A terminals.
(g)
Output the first current (starting with lowest current first) for the 300 A and after proper bridge
measurement cycle (refer to user manuals for bridge), record the measured value under column
(h)
Calculate Actual Deviation and compare to Maximum Deviation. Unit should be within
maximum deviation values. If not, unit will require repair.
(i)
Repeat for all currents listed for each 300 A test point. Always start with lowest current (minimum
heat dissapation) and work to highest current.
4.7.2
Calibration of 100 A (1 m ) Range
(a)
Common and Potential Cables should remain connected as before. Disconnect the 300 A Red
Cable and connect a cable capable of handling 100 A to the
Input Common (Right side)
and 100 A Terminals and to the range extender output high and low.
(b)
Move the two Range Plugs to 100 A. Allow the UUT to stablize 10 minutes prior to starting the
measurements
(c)
Output the first current (starting with lowest current) for the 100 A and after proper bridge
measurement cycle (refer to user manuals for bridge), record the measured value under column
(d)
Calculate Actual Deviation and compare to Maximum Deviation. Unit should be within
maximum deviation values. If not, unit will require repair.
Summary of Contents for 9211B Series
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