How are the various quantities measured?
28
6,000- and 60,000-count digital multimeters
How are the various quantities measured?
*
The connections illustrated in this chapter were made with an MTX 3290
multimeter (6,000 points). They would be the same with an MTX 3291 (60,000 pts).
1. Voltage
measurement
:
AC voltage measurement, or measurement of an AC voltage
superposed on a DC voltage, or DC voltage measurement at high
impedance.
:
This position is provided to allow measurements in electrical
installations. The input impedance <1M
Ω
serves to avoid
measuring "phantom" voltages due to couplings between the lines.
In all cases, “
O.L
” is displayed above 1050V (
MTX 3291
) or 620V (
MTX 3290
)
and a beep sounds when the measurement exceeds 1000V (
MTX 3291
) or
600V (
MTX 3290
).
1. Press:
or
.
2. Select AC+DC, AC or DC coupling of the signal by pressing
(the default coupling is AC+DC).
Depending on what you select, the screen displays DC, AC or AC+DC.
3. Connect the black lead to the “
COM
”
terminal and the red lead to “
V
”.
*
If the connection is not correct, an audible beep and a visible signal
(LEADS) are activated.
4. Place the test probes on the terminals of the circuit to be measured:
5. Read the measurement value indicated on the display unit.
6. As default, the 2
nd
display unit indicates the frequency, except in DC.
*
It is possible to activate the filter in V
LowZ
, V
AC+DC
, V
AC
. The cutoff
frequency of the filter is
≤
300Hz.
When a voltage having a frequency above 150Hz is measured, it is
heavily attenuated, and so a large error may be observed. It is
necessary in this case to deactivate the filter to have the full passband.
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