2
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.
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 rear casing is not fi tted.
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.
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.
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Warning
When using test leads, always keep your fi ngers behind the fi nger
guard on the test lead probe.
Warning
Measuring a voltage that exceeds the specifi ed limits of the unit may
damage the unit and expose the operator to a shock hazard. Always
check the unit’s specifi ed limits before use.
Caution
Avoid severe mechanical shock or vibration and extreme
temperature.
Caution
Remove the batteries when not in use for an extended period, to
avoid corrosion from leaking batteries.
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4
3. OPERATION
3.1 General
If the multimeter does not measure current on the μA/mA ranges, the
internal fuse (F1) may have blown (see section 4.2 Fuse Replacement).
If the multimeter does not measure current on the 20A range 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 the multimeter displays 1 with all other digits remaining blank 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
20A
Input terminal for AC & DC current measurements to 20A
μA mA
Input terminal for AC & DC current measurements to 200mA
COM
Common terminal for all measurements.
Input terminal for AC & DC voltage, resistance, continuity,
V
:
Hz
diode, frequency, duty cycle and logic measurements.
3.4
Description of Press Buttons
POWER
Switches on/off the MM84
DATA HOLD
Activates/deactivates the data hold function
}
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5
3.5 Description of LCD Symbols
Diode testing function is selected
H
Auto hold is selected
LOGIC
Logic function is selected
%
Duty cycle function is selected
mV, V,
Units of measurement being displayed
μA, mA,
:
, k
:
,
M
:
, kHz
Indicates battery is low
AC
Indicates AC measurement range selected
DC
Indicates DC measurement range selected
3.6 Incorrect Connection Warning
If a test lead is connected to the μA mA or 20A input sockets when a
voltage range is selected then a warning buzzer will sound.
3.7 Auto Power Off
The MM84 will auto power off after approximately 45 minutes of
inactivity.
3.8 Data Hold
To hold a displayed value press the
DATA HOLD
button. The LCD will
display
H
.
To exit display hold press the
DATA HOLD
button again.
3.9 AC & DC Voltage Measurement
Connect the black test lead to the COM terminal and the red test lead
to the
%HzV
:
terminal.
Set the rotary switch to either
V
~
or V
and the required range.
Taking all necessary safety precautions connect the test leads to the
circuit being measured and read the measured voltage from the display.
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