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52120A
Users Manual
Calibration Verification – Closed-Loop with 6100A or 6105A
This section contains instructions to do a verification of the Product in a closed-loop
configuration is with a voltage standard. The closed-loop specifications for the Product
are shown in Chapter 1. These specifications include the 1-year specifications for the
Fluke 6105A Electrical Power Standard.
Test Equipment
Table 5-8 is a list of test equipment necessary to do a verification of the Product in
closed-loop setup with a 6100B or 6105A Electrical Power Standard.
Electrical Power Standard
Power Meter
For frequencies above 850 Hz.
2 A, 20 A, 100 A Shunts
DMM
Phase Meter
[1]
The 6105A rear output must be adjusted so errors are no larger than specification for the
confidence checks below to be accurate.
The Power Meter is used as a check reference standard for power line frequencies but has
no better accuracy than the Product for phase angle accuracy and for some amplitude
measurements.
The measurement schemes below cannot be used to verify Product compliance with
specification. If the measured result is significantly larger than the specification of the
power meter, it is likely the Product is out of specification. The Product accuracy
confidence test below can be done to verify accuracy.
Power Line Frequency Confidence Check
The power line frequency confidence check is one measurement on each Product range.
If the power meter does not show phase angle directly, you can calculate the angle on
VA, Watt and PF values. See the Phase Angle Accuracy Confidence Check section in this
chapter. Make sure the voltage connection scheme to the power meter and the 6105A are
the same (two wire or four wire connection). To do a power line frequency confidence
check:
1. Set the 6105A voltage output to 120 V on the 180V range.
2. For each current range, set the 6105A range, rms, and phase angle in Table 5-9.
5-22
Table 5-8. Test Equipment for Closed-Loop Verification
Test Equipment
[1]
Power meter must have an accuracy ≤0.01 %, separate inputs for voltage greater than 1000 V and maximum current
of 120 A, displays voltage, current, phase angle, power factor (PF) or VA and watts.
Recommended Model
Fluke 6105A
As preferred
Fluke A40B
Fluke 8508A
Clarke-Hess 6000
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