Monarch 120 Universal Remote User Manual


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MODEL 120 TRUE RMS MULTIMETER
4
Manual range indication Maximum indication
Relative indication Revolutions per minute
Auto range indication Minimum indication
Data hold indication Peak max/min indication
Low battery indication Diode indication
RS-232 indication Continuity with beeper
AC source Temperature indication
DC source Capacitance indication
Negative polarity indication Voltage/current indication
Auto power off indication Frequency indication
Digital value indication Resistance indication
Analog bar indication
4.0 Control Functions:
4.1 Function Selector Rotary Switch
The rotary switch turns power on to the instrument and selects the function to be
measured. The primary functions available are printed in red and white on the instrument
scale. Alternate functions, accessed in conjunction with the blue Second Function
Button, are printed in blue.
4.2 Range Button
The instrument powers on in the Auto Range mode, as indicated by the
‘AUTO’
indicator
in the display. To select a Manual Range, press the
RANGE
button which will lock the
meter in its’ present range and bring on the
MANU’
indicator in the display. Each
subsequent press of the
RANGE
button circulates the instrument to the next higher range
or wraps from the highest back to the lowest range. To exit the Manual Range mode and
return to Auto Range, press and hold the
RANGE
button for one second.
4.3 MAX/MIN Button
The Maximum and Minimum values are the highest and lowest values displayed during
the time the instrument is in the MAX/MIN mode. To display Maximum and Minimum
values, first ensure the value will not exceed the measurement range selected. Press the
MAX/MIN
button once to display the Maximum value, as indicated by the ‘
MAX’
indicator in
the display. Press it again to display the ‘
MIN’
value and indicator. Press it once more to
display the current value. In this selection, the
‘MAX/MIN’
indicator will flash. To exit the
MAX/MIN mode, press and hold the
MAX/MIN
button for one second.
4.4 Data Hold Function
To hold the current measured value, press the
HOLD
button. Press the
HOLD
button again
to release the held data and return to continuous reading.
4.5 Peak Hold Function
This instrument is equipped with a 1ms Peak capture capability in the ACA, ACV, DCA
and DCV ranges. The Peak values are the highest and lowest transient values captured
by the instrument, regardless of whether or not they might be displayed in the normal
measuring mode. To display Peak values, first ensure the value will not exceed the
measurement range selected. The instrument must then conduct an internal self-
calibration, which calculates and stores the offset voltage in preparation for capturing a
high speed Peak value.
To invoke the calibration operation, press and hold the
PEAK
button for approximately 2
seconds until
‘CAL’
appears in the display. The instrument is now calibrated to properly
capture Peak values.
Press the
PEAK
button again to display the Maximum Peak, as indicated by the ‘P
MAX’
indicator in the display. Press it once more to display the ‘P
MIN’
value and indicator.
Press and hold the
PEAK
button for 2 seconds to exit the Peak mode.
Note: The instrument must be calibrated in accordance with the above procedure
whenever the function range is changed.
MODEL 120 TRUE RMS MULTIMETER
7
5.4 Resistance Measurements
WARNING
Before making any in-circuit measurements, remove power from the circuit
being tested and discharge all capacitors in the circuit.
1. Connect the red test lead to the
‘
:
’
jack and the black test
lead to the
‘COM’
jack.
2. Set the Function Selector switch to the
:
function.
3. Ensure there is no power applied to the circuit, and then
connect the test leads in parallel with the circuit being
tested and read the measured resistance on the instrument
display.
5.5 Continuity Measurements
WARNING
Before making any in-circuit measurements, remove power from the circuit being tested and discharge all
capacitors in the circuit.
1. Connect the red test lead to the
‘
:
’
jack and the black test lead to the
‘COM’
jack.
2. Set the Function Selector switch to the
:
function.
3. Press the blue Second Function button once to select the
function.
4. Ensure there is no power applied to the circuit, and then connect the test leads in
parallel with the circuit being tested.
5. When the impedance between the test leads is less than 40:a continuous beeper
will activate.
Open Circuit Short Circuit
5.6 Diode Tests
WARNING
Before making any in-circuit measurements, remove power from the circuit
being tested and discharge all capacitors in the circuit.
1. Connect the red test lead to the ‘ ’ jack and the black
test lead to the ‘
COM
’ jack.
2. Set the Function Selector switch to the
:
ҏҏҏҏҏfunction.
3. Press the blue Second Function button twice to select the
function.
4. Ensure there is no power applied to the circuit, and then
connect the red test lead to the anode side and the black
test lead to the cathode side of the diode being tested.
5. Read the Forward Voltage (V
f
) on the instrument display.
Note: If the polarity of the test leads is reversed, the display will read ‘OL’. This can be
used to determine the anode and cathode terminals of a diode.
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