Guildline 6624CT-3000, Руководство по эксплуатации

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Section 4
OM6624CT-3000-5-00
11 May, 2016
4-1
4. VERIFICATION AND CALIBRATION
4.1. RATIO ACCURACY VERIFICATION
This procedure covers the ratio accuracy verification of the 6624CT-3000 High Current
DC Transformer.
4.1.1. Purpose
The purpose of this procedure is to assure that the 6624CT-3000 High Current DC
Transformer meets the manufacturer’s specifications. It is recommended that these
procedures be performed after any corrective maintenance activity, or if the operator
perceives a problem with respect to ratio accuracy.
It is recommended that all of these procedures be performed on an annual basis to verify
performance of the 6624CT-3000 for its recertification. The absolute value accuracy of
the high current shunt and the burden resistors to be used in this verification are of prime
importance since the verification is based on the known ratio of these shunt resistors.
4.2. TEST EQUIPMENT REQUIRED
Test equipment of equivalent performance may be substituted from the list provided.
Description Model
DC Resistance Standard Guildline 9230A-10-1
DC Current Shunt Standard Guildline 9230A-300-0.001
100 A DC Current Source Guildline CS1000
Current Source Controller Guildline 66259
Temperature Controlled Oil/Air Bath Guildline 5600, 5010 or 5032
High Accuracy 8.5 Digit DC Voltmeter Agilent 3458A
DCC Bridge Guildline 6622A
High Current Range Extender Guildline 6623A-150
Note: The 6624CT-3000 High Current DC Transformer is calibrated at the factory using a
temperature controlled oil bath controlled to within ± 0.02 C with the ratio of the DC
Current Shunt Standard to that of the DC Resistance Standard known to within 2 parts in
10
6
.
If the ratio of the DC Current Shunt Standard to that of the DC Resistance Standard is not
known in the test environment to within 2 parts in 10
6
additional uncertainties must be
factored into the calibration process.