10
EN
digital multimeter BE49
Measuring resistance
Warning of electrical voltage
Before carrying out resistance, continuity or diode
measurements, switch off the current of the electric
circuit and discharge all capacitors.
1. Set the rotary switch to the resistance measuring range
(
Ω//CAP
), then use the
MODE
button to select the
resistance measurement (
MΩ
indication).
2. Insert the plug of the red measuring tip into the
V/Ω
measuring socket and the plug of the black measuring
tip into the
COM
measuring socket.
3. Connect the measuring tips to the measuring object. The
measuring device may take some time to display a stable
value. This is due to the measuring principle and not a
malfunction.
ð
The measured value will be indicated on the display.
4. Turn the rotary switch to the position that is closest to the
indicated value but does not fall below it.
ð
The measured value will be indicated on the display.
Note:
In case of very low resistance values (400 Ω range) the internal
resistors of the measuring tips and sockets might lead to a
falsified display. The resistance value displayed in case of short-
circuited measuring tips will be put down in writing and later
subtract from the measured value for the subsequent
measurements.
Diode testing
This function permits the testing of semi-conductor paths for
continuity and locking function.
Warning of electrical voltage
Before carrying out resistance, continuity or diode
measurements, switch off the current of the electric
circuit and discharge all capacitors.
1. Set the rotary switch to position
and use the
MODE
button to select the diode test (
indication).
2. Insert the plug of the red measuring tip into the
V/Ω
measuring socket and the plug of the black measuring
tip into the
COM
measuring socket.
3. Connect the measuring tips to the diode.
The following indications are available:
•
OL: wrong polarity – swap the connections of the
measuring tips on the diode
•
OL (even after measuring tips have been swapped): open
circuit
•
0.2 V to 0.7 V: the component is working properly (approx.
0.2 V for Ge diodes and approx. 0.5 V in case of Si diodes).
•
Value close to 0 mV: circuit is shorted
