Conrad VC630 Notice D'emploi page 12

5.5 mA DC and mA AC current measurement
For the measurement of DC and AC currents up to 400 mA max., proceed
as follows:
a) Switch the measuring instrument on. The initial configuration is
always AC voltage measurement in "AUTO" (automatic range selec-
tion) mode. Now press the „mA•TEMP•A" once. The measuring
instrument switches to mA AC current measurement, recognisable
through the symbol "AC" adjacent to and to the left of the measured
value. For the measurement of DC currents up to 400 mA max. press
the "AC/DC" button once.
b) Connect the black test lead to the "COM" measuring instrument
socket and the red test lead to the "mA" socket (VC 630) or
„mA•TEMP• " socket (VC 650 and VC 670).
c) The bar graph beneath the measured value is active during measure-
ment, being similar to an analogue indicator with a faster reaction
time. The bar graph operates as a trend indicator.
d) Connect the test leads in series with the object to be measured (see
following illustration).
Fuse
Current
~
source
Attention!
When a "-" appears in front of the DC current measured value, the mea-
sured current is negative (or the test leads are reversed).
Do not measure any currents in circuits in which voltages greater than
250 VDC or VAC rms can occur, otherwise as a result life can be endan-
gered. Never measure currents over 400 mA. Measure currents equal to
or lower than 400 mA only in circuits themselves protected by a 400 mA
quick-blow fuse.
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Measuring
instrument
A
Load
Note!
1. The frequency of the AC current is also indicated during AC current
measurement in addition to the measured value and the bar graph in
the bottom right of the sub-display ("small" display). In this connec-
tion, note the following illustration.
AUTO
AC
0
2. The VC 670 measures the true rms of an AC input. This type of mea-
surement is always useful where non-sinusoidal, overloaded, mixed-
frequency or high frequency (switching power supply) signals are
concerned.
3. Selectable special functions
The following sub-functions, according to multimeter model, are sel-
ectable by means of the "ENTER MENU" button:
"Æ%" reference value measurements, "MIN/MAX" value capture,
"TIME", "REC" record measured value, "RCLL" measured value recall,
"LMT" comparison function (VC 670 only) and "PH" peak value mea-
surement (VC 650 and VC 670 only). These sub-functions are descri-
bed in more detail in section 5.12.
5.6 20 A DC and AC current measurement
For the measurement of DC or AC currents up to max. 20 A, proceed as
follows:
a) Switch the measuring instrument on. The initial configuration is
always AC voltage measurement in "AUTO" (automatic range selec-
mA
+10 +20
Hz
mA
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