12
8. AC/DC voltage and frequency measurements
Note: Measured voltage must not exceed 600 V phase to earth or Phase to Phase
Frequency measurement is not available on MIT400, MIT405 and MIT480 models.
Procedure for measurement of voltage and frequency
(Refer to Figure 5)
Note on TRMS measurement:
IN TRMS mode the MIT400 will measure both AC and DC components of the supply voltage (AC+DC).
In DC mode only the DC component is measured.
1.
Rotate selector switch to the ‘V’ position.
2.
Connect test leads to the circuit under test.
3.
‘TRMS’ is the default mode on power-up. Press the [TRMS] button to select DC or return to
TRMS if required.
4.
The measured voltage will be displayed on the main digital scale in units of V or mV, as
appropriate In TRMS mode, the measured frequency (Hz) will be simultaneously displayed on
the MIT410, MIT420, MIT430, MIT 481, and MIT 40X instruments (as shown on Screen A). See
Figure 5 Screen B for dc mode display.
5.
For MIT420, 430, 481 and 485, the measured result may be stored if required by pressing the
‘STORE’ button. Refer to section 14 for further information.
DC indicated
Screen B:
Screen A (a.c.)
Analogue a.c. voltage
displayed
Step 4:
Voltage and frequency
display d.c. and voltage
display in d.c. mode
Step 5:
Result store button
Step 3:
TRMS/DC
Step 2:
Connect test lead to
circuit under test
Measured frequency
TRMS indication
Measured a.c. voltage
(V or mV)
Test button
Step 1:
Selector switch
Figure 5 Voltage and frequency measurement
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