How are the various quantities measured?
6,000- and 60,000-count digital multimeters
31
How are the various quantities measured? (continued)
3. Frequency
measurement
1. Press:
.
2. Connect the black lead to the “COM” terminal and the red lead to “
V
”.
3. Place the test probes on the terminals of the circuit to be measured.
*
Connect the instrument as for a resistance measurement.
4. Read the measurement value indicated on the display unit. The second
display unit indicates the period of the signal, 1/F.
5. Press
several times to obtain (
MTX 3291
only):
•
positive duty cycle (DC+)
•
negative duty cycle (DC-)
•
positive pulse duration
(Pw+)
•
negative pulse duration
(Pw-)
*
It is possible to activate the filter in A
AC+DC
, A
AC
. The cutoff
frequency of the filter is
≤
300Hz.
4. Resistance
measurement
1. Press the
button of the switch.
2. Connect the black lead to the “COM” terminal and the red lead to “
V
”.
3. Place the test probes on the terminals of the component.
*
Resistance measurements must be made with power off. However,
while the presence of a voltage will prevent or throw off the
measurement, it will not damage the instrument.
4. Read the measurement value indicated on the display unit.
5. “O.L” is displayed, if the circuit is open.
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