VOLTCRAFT VC-335 Operating Instructions Manual page 41

3. Press the release lever (11) to open the clamp. Clamp the individual conductor to be
measured and reclose the clamp. Position the conductor in the middle of the two arrow
markings on the clamp.
4. The LCD shows the measured current. Beeps sound if the measuring range (200 A) is
exceeded.
5. After measurement, disconnect the digital clamp multimeter from the test object and turn
off the product.
Measurement of direct currents (A
• Turn on the product using the rotary switch and select measuring function A
shows < DC > and < A >.
• In the direct current measuring range, a low current may be
shown in the display due to the high sensitivity and the ambient
magnetic field (i.e. the Earth's magnetic field, etc.) even if
the clamp is closed. Manually zero the display prior to each
measurement or when changing a power cable.
• Perform a zero adjustment without the conductor and with the
clamp closed. To do so, briefly push the ZERO key (9). A beep
sounds and the LCD shows < ZERO > (D) to confirm the zero
adjustment. Each time you push the ZERO key, the display is
zeroed. Push and hold the ZERO key for approx. 2 seconds to
deactivate this function. The display no longer shows the < ZERO > symbol. The device is
now in normal measurement mode without zero adjustment.
• Heed the correct polarity of the clamp for direct current measurement. The polarity symbols
/ are visible on the front and back of the clamp. When the connection is correct, the
cable leads from the current source (+) through the front of the clamp to the load (fig. 3).
• Press the release lever (11) to open the clamp. Clamp the individual conductor to be
measured and reclose the clamp. Position the conductor in the middle of the two triangular
position symbols on the clamp.
• The LCD shows the measurement.
When in direct current measurement a minus sign "-" precedes the measurement, the
current is traveling in the opposite direction (or the clamp is inverted).
)
. The display
Consumer
CAT II
600V
CAT III
300V
200A
NCV
VC-335
A
A
ºFºC
HzV
OFF
V ºC
Hz
Power
source
Fig. 3
41