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emits a continous tone.
-
By means of the "RANGE" key, it is possible to change between the func-
tions continuity test and diode test.
see Figure 6:
8.6 Diode Testing
-
Turn the rotary switch of the BENNING MM 1 to select the appropriate
range identified by a buzzer and diode symbol
-
Press the "RANGE" key to change to diode test function.
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Connect the black safety test lead to the COM-terminal of the
BENNING MM 1.
-
Connect the red safety test lead to the input terminal for V, Ω, µA, of the
BENNING MM 1.
-
Connect the safety test leads across the diodes and read the measured
value on the digital display of the BENNING MM 1.
-
For a typicale silicone diode tested in the forward-based direction a voltage
flow between 0,500 V and 0,900 V is displayed. A display showing"000 V"
indicates a short circuit in the diode, whereas a display showing "1,5 V"
indicates an open circuit in the diode.
-
For a diode tested in the reverse-based direction the display reads "1,5 V".
If the diode is damaged, the display will show "000 V" or other values.
see Figure 7:
9.
Maintenance
Remove test leads and turn the power off before opening the
BENNING MM 1! Dangerous voltage!
Any work to be carried out on an opened BENNING MM 1 under voltage is
strictly reserved for qualified electrotechnical personnel who must take
special precautionary measures to avoid accidents.
This is how to ensure that the BENNING MM 1 is free from any voltage before
the instrument is opened:
-
first remove the safety test leads from measured object.
-
then remove both safety test leads from the BENNING MM 1.
-
turn the rotary switch to the "OFF" position.
9.1 Instrument safe-guarding
In certain circumstances, safety during the use of the BENNING MM 1 can no
longer be guaranteed; when for instance:
-
there is visible damage to the housing
-
measurement errors occur
-
the instrument has been subjected to prolonged storage under unfavorable
conditions and
-
the instrument has been subjected to severe transport stresses.
In such cases the BENNING MM 1 must be immediately switched off, removed
from the measurement points and secured against any future unintentional
operation.
9.2 Cleaning
Wipe the case of the BENNING MM 1 with a clean dry cloth (exception: spe-
cial cleaning cloths). Do not use any solvents and/or abrasives to clean the
BENNING MM 1.
9.3 Battery replacement
Remove test leads and turn the power off before opening the
BENNING MM 1! Dangerous voltage!
The BENNING MM 1 is powered by two 1.5 V batteries. Battery replacement
(see figure 8 below) becomes necessary when the low battery indicator
shows in the display .
This is how to change the battery:
-
Remove the safety test leads from the measured circuit.
-
Remove the safety test leads from the BENNING MM 1.
-
Turn the rotary switch to the "OFF" position.
-
Remove the protective rubber holster from the BENNING MM 1.
-
Place the BENNING MM 1 on its front side and remove the screw from the
case back.
-
Lift the end of the case back near the input terminals until it gently unsnaps
from the case front at the end nearest to the LCD display .
-
Remove the empty batteries from inside the battery holders.
05/ 2019
Continuity Testing with buzzer
Diode Testing
BENNING MM 1
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13
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