Metrix MX 430B Notice De Fonctionnement page 29

MX 430B
3.3 - OPERATION 3.3 - OPERATION
3.3 - OPERATION 3.3 - OPERATION 3.3 - OPERATION
3.3.1 Calibration 3.3.1 Calibration 3.3.1 Calibration
3.3.1 Calibration 3.3.1 Calibration
Must be done after long storage (> 1 year) or after any repair over the warranty
period.
Nota Nota
Nota : Undo 4 screws (2 inside the fuses + cell (s) compartment) at the Nota Nota
back of the instrument to get access to internal circuits. Check that
t h e p o i n t e r i s a t z e r o .
The accuracy of the standard sources must be ± ± ± ± ± 0.5 % at FSD The accuracy of the standard sources must be The accuracy of the standard sources must be
The accuracy of the standard sources must be The accuracy of the standard sources must be
- 50 mV DC range (25 µA DC) : with 50 mV DC at input. Adjust R33 to make
the pointer deflect to FSD
- 150 µA DC range : with 150 µA DC at input. Adjust R34 to make the pointer
deflect to FSD
- 50 mV DC/25 µ A DC range : with 25 µA DC at input. Adjust R34 if necessary
(if error would exceed 0.8 %)
- 5 V AC range : with 250 µA AC at input. Adjust R35 to make the pointer deflect
to FSD
- 1.5 mA AC range : with 1.5 mA AC 50 Hz at input. Adjust R36 to make the
pointer deflect to FSD
- Standard resistance at ohmmeter (linear 50 W range) input. Adjust R37 to
make the pointer deflect to FSD.
Check the expected accuracy on each other range of the multimeter.
0.5 % at FSD 0.5 % at FSD 0.5 % at FSD
0.5 % at FSD
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