Current Measurement - Conrad 4660 M Mode D'emploi

To measure DC or AC voltage proceed as follows:
1. Connect the red test-lead with the V/Ω socket (12) and the black test-
lead with the COM-socket (11).
2. Set the rotary function switch to the desired position (range). You
have 5 ranges for dc voltage ( DCV) or AC voltage (ACV) measurement
each. During AC voltage measurement the right sub-display will show
the dB-value of the AC voltage, the middle sub-display the frequency
and the main display the present measuring value.
3. Connect the test-lead tips with the object to be measured (load, cir-
cuit etc).
4. The respective polarity of the value is displayed together with the cur-
rent measuring value in the main display.
Each of the five voltage ranges presents an input impedance of 10 mΩ
(in parellel with < 20 pF). AC-voltage input is AC-coupled.
As soon as " − " is set before the value during DC voltage measurement,
the voltage is negative (or the test leads are confused).
~
voltage source
Hint
Due to the sensitive nature of the input terminal your meter might dis-
play any small values (not connected with the object). This residual
value will not affect the actual measurements. It will vanish as soon as
you start measurement. But Auto-Power-Off is not active when the
"phantom-measurements" are displayed.
During DC voltage measurement the three sub-displays below the main
display are active. In the left sub-display the measuring value appears
1 second later, in the middle sub-display the measuring value appears
2 seconds later and in the right sub-display the measuring value appears
3 seconds later.
20
object
V
Fig.2 AC voltage/DC voltage, (page 141)

5.2 Current Measurement

Follow these steps to measure DC or AC current:
1. Connect the black test-lead with the COM-socket (11) and the red
test-lead with the mA-socket (10), if you want to measure current to
200 mA max. and with the 20-A-Socket (9), if you want to measure
current over 200 mA to 20 A max.
2. Set the rotary function switch to current measurement (2m or 200 m
or 20 DCA/ 2m or 200 m or 20 ACA).
3. Connect the test-leads in series with the circuit or load. (See following
drawing).
~
current source
Attention!
Never measure currents in circuits in which voltages over 250 VDC/
VACrms could exist, this is life dangerous! Never measure currents
exceeding 20 A.
Only measure in circuits which are fused with 16 A or in which powers
exceeding 4000 VA could not exist. Current measurements of 20 A may
not last longer than 30 seconds and may only be executed in intervals
of 15 minutes.
During AC current measurement the middle sub-display will show the
frequency of the AC voltage (in the range of 40 Hz to 400 Hz) and the
main display shows the present measurement.
During DC current measurement the three sub-displays below the main-
display are active. In the left sub-display the present reading is taken
1 second later, the middle display the reading is taken 2 seconds later
and in the right display the reading appears 3 seconds later.
multimeter
A
object
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