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1.4 Battery Installation
Refer to section 4.1 (Battery Replacement) for the battery
installation instructions for the MM68.
Likewise, if test lead accessories such as crocodile clips are also
used, the measurement category will be the lowest measurement
category in that combination.
Warning
Always test this unit on an appropriate proving device or known
voltage source before and after using it to determine if a
hazardous voltage exists in a circuit to be tested.
Warning
When using test leads, always keep your fingers behind the finger
guard on the test lead probe.
Warning
Measuring a voltage that exceeds the specified limits of the unit
may damage the unit and expose the operator to a shock hazard.
Always check the unit's specified limits before use.
Caution
Avoid severe mechanical shock or vibration and extreme
temperature.
2. PRODUCT SPECIFIC SAFETY INFORMATION
Measurement Category II (CAT II) is applicable to test and
measuring equipment connected directly to utilization points
(socket outlets and similar points) of the low-voltage MAINS
installation.
Measurement Category III (CAT III) is applicable to test and
measuring equipment connected to the distribution part of the
building's low-voltage MAINS installation.
Measurement Category IV (CAT IV) is applicable to test and
measuring equipment connected at the source of the building's
low-voltage MAINS installation.
2.1 Precautions
This product has been designed with your safety in mind, but
please pay attention to the following warnings and cautions before
use.
Warning
Before use check the unit for cracks or any other damage. Make
sure the unit is free from dust, grease and moisture. Also check
any associated leads and accessories for damage. Do not use if
damaged.
Warning
Do not use if the battery/fuse cover is not fitted.
Warning
When this unit is used in combination with test leads, the
measurement category of the combination is the lower
measurement category of either this unit or the test leads used.
2
3
3. OPERATION
3.1 General
If the multimeter does not measure capacitance or current on the
A/mA ranges, the internal fuse (F1) may have blown (see section
μ
4.2 Fuse Replacement).
If the multimeter does not measure current on the 10A the internal
fuse (F2) may have blown (see section 4.2 Fuse Replacement).
If the magnitude of a parameter to be measured is unknown, but
known to be within the maximum safe limits of the multimeter, then
manually set the range to maximum. For example, if measuring DC
voltage and the voltage magnitude is unknown, set the range to
1000V, then if required select autoranging for a satisfactory reading.
If a test lead is connected to the wrong input socket when a
voltage range is selected then a warning buzzer will sound.
If the multimeter displays OL or -OL then the measurement limits
of the range have been exceeded.
3.2 Low Battery Indication
If the
symbol is displayed then the battery needs replacing
(see section 4.1 Battery Replacement).
3.3 Description of Terminals
μA mA
10A
COM
4
5
Input terminal for AC & DC current
measurements to 220 mA and capacitance
measurements.
Input terminal for AC & DC current
measurements to 10A
Common terminal for all measurements
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