MEASURING CAPACITANCE
To avoid possible damage to the meter or other
equipment, turn off the power source and discharge all
high-voltage capacitors.
(1) Disconnect the capacitor from power.
(2) Short the capacitor’s terminals to discharge it.
(3) Disconnect any resistors between the terminals of the
capacitor.
(4) Turn the rotary function switch to the
position.
Until the test leads are plugged in, the primary
readout will show
0.000 nF
.
(5) Plug the black test lead into the front-panel
COM
jack
and the red test lead into the
jack.
(6) Connect the test leads to the terminals of the
capacitor.
(7) Read the measured capacitance on the display.
MEASURING FREQUENCY
AND DUTY CYCLE
As described earlier, the DMM550 automatically
measures the frequency of measured AC currents and
voltages and displays them on the secondary readout.
However, the range of frequencies that can be measured
and displayed in this way is limited to 10Hz to 1kHz.
Using the
Hz%
position of the rotary function switch
expands the range of measurable frequencies to 10Hz to
40MHz, while providing better measurement resolution
(via multiple ranges) and greater measurement accuracy.
To measure frequency
in this way:
(1) Turn the rotary function switch to the
Hz%
position.
(2) Plug the black test lead into the front-panel
COM
jack
and the red test lead into the
jack.
(3) Touch or clip the test leads to the voltage source or
between loads.
(4) Read the measured frequency on the primary readout
and the duty cycle (as a percentage) on the secondary
readout.
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