Benning MM 1 - Direct Current Ranges; Resistance Ranges; Measuring with BENNING MM 1; Measurement Preparation

08/ 2008 BENNING MM 1 11

7.3 Direct current ranges
Range Resolution Accuracy Burden voltage
Overload
protection
320 µA 0,1 µA
± (1,0 % of reading
+ 2 digits) or 3200 µA
< 3 mV/ µA 600 V DC/ AC
3200 µA 1 µA
± (1,0 % of reading
+ 2 digits) or 3200 µA
< 3 mV/ µA 600 V DC/ AC
7.4 Resistance ranges
Overload protection for resistance measurements: 600 V
rms
.
Range Resolution Accuracy Max. open circuit voltage
320 Ω 0,1 Ω ± (1,0 % of reading + 4 digits) 1,3 V
3,2 Ω 1 Ω ± (0,8 % of reading + 2 digits) 1,3 V
32 kΩ 10 Ω ± (0,8 % of reading + 2 digits) 1,3 V
320 kΩ 100 Ω ± (0,8 % of reading + 2 digits) 1,3 V
3,2 MΩ 1 kΩ ± (0,8 % of reading + 2 digits) 1,3 V
32 MΩ 10 kΩ ± (0,8 % of reading + 5 digits) 1,3 V
7.5 Diode Testing
The accuracy indicated below is valid in the range of 0.4 V to 0.9 V.
Overload protection for diode testing: 600 V
rms
/ 600 V DC.
Range Resolution Accuracy
Maximum
current
Max. open circuit
voltage
1 mV ± (1,5 % of reading + 5 digits) 1,5 mA 3,3 V
7.6 Continuity Testing
The built-in buzzer sounds if the resistance R falls below 20 Ω.
8. Measuring with BENNING MM 1
8.1 Measurement preparation
The BENNING MM 1 must be used and stored only at the indicated storage and
working temperatures, avoid exposure to continuous sunlight.
- Check the rated voltage and current indications on the test leads. The
safety test leads provided with the BENNING MM 1 correspond specifically
to the rated voltage and current of the BENNING MM 1.
- Inspect the test leads for damaged insulation. If the insulation is damaged,
the test leads should be discarded immediately.
- Check test lead continuity. If the conductor in the test lead is damaged, the
leads should be discarded immediately.
- Remove test leads from circuit to be measured before turning the rotary
switch  to select another function.
- If the BENNING MM 1 is used near strong noise generating sources, the
display may become unstable and measurement errors may arise.
8.2 Voltage measurement

To avoid electrical shock, observe the maximum rated voltage
to earth ground !
The maximum rated voltage that should be applied between any of the following
terminals of the BENNING MM 1 and earth ground is 600 V.
- COM terminal 
- Input terminal for V, , and µA, 
8.2.1 Voltage measurement
- Select the appropriate voltage type with the rotary switch  of the
BENNING MM 1.
- Select manual range by pressing "RANGE" button if required.
- 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,  and µA,  of
the BENNING MM 1.
- Connect the safety test leads to the circuit measurement points and read
the measured value on the digital display  of the BENNING MM 1.
see Figure 2: Direct voltage measurement