9
DC CURRENT MEASUREMENT
(72-3099 ONLY)
•
Push the switch to DC current gear. If the LCD display is not set to zero, press
REL
to clear.
•
After measuring the big current gear, the clamp head will be left with remanence
and the LCD will have base values.
•
Press the trigger to open the clamp head and take the conductor to be measured,
then slowly loosen the trigger until the clamp head is completely closed.
•
Ensure the conductor to be measured is clamped at the centre of the clamp head,
otherwise an error may occur.
•
The clamp ammeter can only measure one current conductor. Measuring two
or more current conductors concurrently may result in incorrect measurement
readings.
•
Directly read out the measured DC current value from the
display.
Note:
•
Current measurement must be operated within 0°~40°C.
If a positive reading is achieved after measuring DC
current, the current direction will go from up to down. Do
not loosen the trigger abruptly as the Hall component is
sometimes sensitive to magnetization, heat, mechanical
stress and also to impact, which may cause short-time
reading variation.
•
Ensure the conductor to be measured is clamped at the
centre of the clamp head. If it isn’t, an additional reading
error of ±1% may result.
AC VOLTAGE MEASUREMENT
•
Insert the red test pen into the “V” jack and the black test pen into the “COM” jack.
•
Push the function range switch to the AC voltage measurement gear and connect
the test pen in parallel with the power or load to be measured.
•
Read the true value of the AC voltage from the display.
•
Press and hold the
SELECT
key in AC voltage gear to
select VFC measurement and measure the frequency
converted voltage
(72-3099 only)
.
•
For 72-3099, pressing and holding the
SELECT
key
can select frequency measurements of AC voltage.
Note: the following conditions must be met when
reading frequency value:
input range ≥ range x 10%. (Testing range of
frequency gear at voltage gear is 40Hz-400Hz).
Note:
•
Do not input voltage higher than AC 750V. It may be
feasible to measure higher voltage, but damage will
be caused to the meter.
