User manual

42 GMC-I Messtechnik GmbH
V/Hz, , Temperature, and A/Hz Measurements
5.7.1 Direct and Pulsating Current Measurement, Direct Connection, A
DC and A (DC+AC)
➭ First disconnect supply power from the measuring circuit or
the power consumer, and discharge any capacitors.
➭ In accordance with the current to be measured, set the rotary
switch to A or A
.
➭ Select the type of current appropriate for the measured quan-
tity by briefly pressing the multifunction key FUNC | ENTER. Each
time the key is pressed, the instrument is switched back and
forth between A DC and A (DC + AC)
TRMS
, which is indicated
by means of an acoustic signal. The current type is indicated at
the LCD by means of the DC or the (DC+AC)
TRMS
symbol.
➭ Safely connect the measuring instrument (without contact re-
sistance) in series to the power consumer as shown.
➭ Switch supply power to the measuring circuit back on.
➭ Read the display. Make a note of the measured value if the in-
strument is not being operated in the memory mode or the
transmission mode.
➭ Disconnect supply power from the measuring circuit or the
power consumer once again, and discharge any capacitors.
➭ Remove the test probes from the measuring point and return
the measuring circuit to its normal condition.
➭ Direct frequency measurement, A (DC + AC)
TRMS
(see follow-
ing section).
COM mA A
~
R
x
~
R
x
1
3
2
I > 10 A
!
A
A
300 A / 3 mA
30 mA / 300 mA
3 A / 10 A (10 A max. 5 min)
8 . 8 . 8 . 8 . 8
!
I > 16 A
Current
Measuring Ranges:
Current measurement
may only be performed
with installed batteries!
*
Additional temperature display
(internal temperature at jacks)
in the 3 A and 10 A ranges
(16 A max. 30 s)
002.500
A
DC
002.50
A
DC
AC
TRMS
A
A
FUNC
ENTER
24.6° C
*
24.6° C
*
015 . 000
Hz
Hz