Fluke 433 - Page 40

Fluke 433, 434, 435
Service Manual
3-16
13. Check the 6 kV range according to the table below.
Table 3-13. Accuracy Check of Voltage Channel N (Neutral)
Set Calibrator to Readout at Voltage Channels N
0 Hz, 0 V, OPR 0 ... 10 V
400 V, 50 Hz, OPR 390 ... 410 V
1000 V, 50 Hz, OPR 990 ... 1010 V, 49.99 ... 50.01 Hz
14. Set the Calibrator to STBY.
Optional Test. Bandwidth Check of Channel N (*):
Note: for Fluke 435 you must use the Fluke 5700A Calibrator. This instrument is able to
generate 219.99999 V as a maximum at 3 kHz. Therefor a 50 Hz reference voltage of 215
V must be adjusted.
15. Set the Calibrator to 400 V (5700A: 215 V), 50 Hz and OPR.
16. Now check the voltage channel N. Use the Calibrator’s field edit function (5500A:
FIELD EDIT key, 5700A: AMPL/FREQ key) to adjust the Calibrator to an Analyzer
readout of 400 V / 215 V.
17. Increase the frequency to 3 kHz.
Fluke 434: check for a readout of 378 V or more.
Fluke 435: check for a readout of 204 V or more.
18. Set the Calibrator to STBY.
Note: bandwidth will be slightly higher than in V/A/Hz mode because a low pass filter in
the analog input channel is off during Transients mode.
3.8 Channel Isolation (*)
This optional test verifies cross talk from voltage channels to current channels. Voltage
channels normally get high voltages while the current channels have a sensitivity of a
couple of volts. This way of testing verifies the most critical situation.
Proceed as follows:
1. Connect the Analyzer’s A/L1, B/L2, C/L3, and N voltage inputs with the HI output
of the Calibrator.
Connect the Analyzer’s GND input with the LO output of the Calibrator.
2. Set all current channels to 1 mV/A, 400 A, 1:1 (SETUP menu, arrow and ENTER
keys).
Put the Analyzer in 3-phase WYE, 50 Hz, 400V, and V/A/Hz mode.
3. Short-circuit the four current inputs with a termination piece of 50 Ω or lower. Refer
to Figure 3-5.
4. Set the Calibrator to 800 V, 50 Hz, and OPR.
5. Check that the readout on all current channels does not exceed 19 A (this includes the
5 A basic error of the current channels).
6. Set the Calibrator to STBY.