Calibration; Required Equipment; Calibration Adjustment - Fluke 1750 Calibration Manual

1750
Calibration Manual
Applie
d
Voltage
[Vrms]
800
850
900
950
1000

Calibration

Required Equipment

The required equipment and cables for calibrating the Recorder are listed in Tables 2 and
3.
To avoid electrical shock, personal injury, or fire:

Calibration Adjustment

The Recorder features closed-case calibration adjustment using known reference sources.
During calibration, the Recorder measures the applied reference source, calculates
correction factors, and stores the correction factors in nonvolatile memory.
Perform calibration adjustment if the Recorder fails any performance test in the
verification procedure.
Calibration should be performed under ambient temperature conditions
between 20 C and 30 C.
Calibration consists of four parts: I-Wave, I-Rogowski, V-Wave, and V-Impulse. Each
part calibrates one measurement system in the Recorder. For each part, the calibration
values are checked to be sure the Recorder is working correctly and calibration results are
valid. All of the calibration steps for each of the four measurement systems must be
completed before the calibration values can be written to the Recorder's nonvolatile
memory.
I-Wave, I-Rogowski, and V-Wave channels are calibrated using 55 Hz sine wave signals
to minimize 50 Hz or 60 Hz power line interference with the calibration measurements.
V-Impulse channels are calibrated using dc voltages, averaging calibration measurements
to suppress power line interference.
14
Table 8. Impulse Verification Inputs
Expected
Reading Channel
[Vpk]
1131 AN (A)
1202 BN (B)
1273 CN (C)
1344 NG (N)
1414 NG (G)
Do not perform the calibration procedures or calibration
verification tests described in this manual unless you are
qualified to do so.
Repairs or servicing should be performed only by qualified
personnel.
Measured Magnitude
|Vpk|
XWWarning
Note
Limits
[Vpk]
± 77
± 80
± 84
± 87
± 91