Fluke 434-II/435-II/437-II
Service Manual
5-8
5.6 Final Calibration
Before starting the final calibration you must have done the Warming Up (section 5.5)!
The final calibration is simple and straightforward and consists of the following
elements:
- Offset adjustment of voltage and current inputs (0 V input signal).
- Low voltage adjustment of voltage and current inputs (0.67 V rms, 50 Hz input signal).
- Low voltage adjustment of gain x10 of current inputs (0.2 V rms, 50 Hz input).
- Voltage gain adjustment of voltage inputs (120/230/480/600 V rms, 50 Hz input).
The final calibration requires input conditions that will be described in each step. You
must always start the Final Calibration at the first step, see Section 5.6.1. Starting at
another step will make the calibration invalid!
If you proceeded to calibration step N (for example step CL 0320), then return to a
previous step (for example step CL 0310) , and then calibrate this step, the complete final
calibration becomes invalid; then you must repeat the calibration starting at 5.6.1.
It is allowed to repeat a step that shows the status
:READY by pressing
F3
again.
5.6.1 Warming Up Final
Proceed as follows to do the Warming Up Final adjustment:
1. Press
F2
NEXT to select Calibration step CL 0201. Do NOT apply any input
signal (open inputs).
2. Press
F3
CALIBRATE.
3. Wait until the display shows
:READY.
4. Press
F2
NEXT and continue at section 5.6.2.
5.6.2 Offset adjustment
Proceed as follows to do the Offset adjustment of all inputs:
5. Connect the Analyzer to the Calibrator as shown in Figure 5-3.
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