VOLTCRAFT VC 820-1 Notice D'emploi page 30

Caution!
Never exceed the max. input values!
For voltages lower than 300mVrms (measured at 1 kHz) up to 1MHz a frequency
measurement cannot be performed, and for voltages lower than 600mVrms from
above 1 MHz up to < 10MHz a frequency measurement cannot be performed.
Notes!
The following subfunctions can be set:
Holding the measuring value „HOLD H" and switch-over from „Hz" (frequency
measurement) up to „%" (pulse pause ratio measurement).
Measuring direct and alternating currents
Proceed as follows to measure AC/DC currents:
a) Connect the measuring lines to the measuring instrument turned off; ensure the
correct polarity. Depending on the current range you select for your measurement
(µA, mA, A), the measuring lines are to be connected differently to the measuring
instrument. The red measuring line is to be connected to the „µA/mA" socket for
measurements in the range of between 0 and 4000µA or between 0 and 400mA
and for measurements in the range from 0.4A to 20A it is to be plugged into the
„20A" socket. The black measuring line is to be connected to „COM" (= ground or
„-"). Make sure they are plugged in properly.
b) Depending on the current values you want to measure, move the rotary switch to
„µA", „mA" or „A" and turn on the measuring instrument. After a very brief initialisa-
tion phase (all segments), the direct current measurement is turned on now. To be
able to measure alternating currents, press the blue second-function switch top
right of the rotary switch once. Then, the symbol of the alternating quantities „AC" (=
alternating current) is displayed left to the value measured. Moreover, the automatic
range selection, indicated by „AUTO", is active. That means that the lowest possible
range of measurement is set with a resolution of 0.1µA.
c) Connect the measuring lines in series to the object to be measured (see following
figure).
~
power
source
Caution!
If for DC measurements a minus „-" appears in front of the value measured, the
measured current is negative (or the measuring lines have been mixed up).
Never exceed the maximum input values of the input used, because this could
destroy the fuse.
The following subfunctions can be set:
Holding the measuring value „HOLD H", reference measurement „REL" and
manual range selection „RANGE".
30
fuse
A
ammeter
consumer
load, switch