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All test equipment must be energized a sufficient time so they operate at
their full specification. Refer to the applicable user documentation.
1. Set the calibrator to 0 volts dc in standby mode.
2. Open the guard to ground link on the calibrator.
3. Push V on the Product to set the input to volts.
4. Push K on the Product to set the output terminals.
5. Push B on the Product to set the range to 2 A.
6. Set the DMM to the 2 volt range.
7. Configure the DMM to 2wV, Resolution to 6 digits, Filter off, and Fast off.
8. Set DMM guard to local.
9. Set the DMM to front input.
10. Do a Zero Range on the DMM. This does a zero adjustment of the DCV, 2 V range.
Calibration Verification – Standalone Mode
Verification is done with LCOMP OFF. The Fluke 5720A supplies the input to the
Product. The Product output current is changed to a voltage by the A40B shunt. The
8508A shows the shunt output voltage which is changed to output current with the 8508A
Math function.
Conversion of A40B/8508A measurements to current
In the procedure below, the Fluke A40B shunts make a voltage from the current that
flows through them. Use the formula that follows to calculate the equivalent current
value.
For example, to calculate the equivalent current value for a DMM measurement of
0.47995 volts across a shunt with a calibration resistance of 0.040005 Ω:
Product Input Protection: Measures to Keep Nuisance Input Overload Trips to a
Minimum
Because of the relatively high power of the Product, the input has protection against
over-voltage and over-current inputs. An input larger than the input limit level for more
than three milliseconds causes the Product to go to Standby. This verification procedure
uses a Fluke 5720A as the input signal source.
For some conditions, changes to the 5720A can cause the output to briefly go above the
maximum input level for the set range. If this occurs, you can use two procedures to keep
input overloads to a minimum. When the input is a voltage, set the Product to standby
(STBY - output OFF) before you change the input signal. When the input signal is a
current, turn off the 5720A output before you change function or level.
Note
Equivalent current value =
Equivalent current value =
8508A measurement (V)
Calibrated shunt value (
0.479950
= 11.99725 A
0.040005
Calibration
Introduction
Ω)
5
5-5
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