Mastech MS2140A, Manual, Page: 11 / 15

17 18
4.4 Maximum/Minimum recording
1) Press “MAX/MIN” button once to display the
maximum measurement and press “MAX/MIN”
button again to display the minimum, press
“MAX/MIN” button a third time to return to
normal mode.
2) In Max/Min mode, measurement is saved
automatically.
3) Max/Min values are displayed on the secondary
display while the current measured value is
displayed on the main display.
Note:
1) The Meter is set to manual mode when using
Max/Min measurement.
1) When rotary switch is on Resistance, Diode,
capacitance, and continuity mode, press
“FUNC”
button to switch between those four.
2) When rotary switch is on Voltage and Current mode,
press
“FUNC” button to switch between AC and DC.
4.5 Function switching
1) Press
“ZERO/REL” button to enter relative
measurement mode. When in this mode, the current
reading will be stored and shown on the secondary
display while the main display with show the
difference of current reading and stored reading.
REL (Output) = (current reading) – (reading when
button pressed).
2)
“REL” can only perform under manual mode.
4.6 ZERO/REL
4.7 INRUSH
When in AC Current measurement mode, press the
“INRUSH” button to enter surge current measurement
mode. Press button again to return to normal mode.
4.8 Auto Power Off
1) When not in use, the meter will automatically turn
off after 20 minutes.
2) After Auto Off, press any button to bring power
back on.
3) To disable Auto Off, hold
“ZERO/REL” when turning
on the Meter.
4) When auto power off is on, symbol appears on,
symbol appears on screen. screen.When disabled,
symbol does not appear.
4.9 Measuring Preperation
1) Turn on the meter by turning the rotary switch.
If battery voltage is low ( 3.6V), “ ” appears;
replace the battery.
2) “ ”indicates input voltage or current should not
exceed the indicated value; this is to protect the
meter from damage.
3) Turn the rotary switch to the proper position.
4) When connecting to the circuit, connect
COM input
first before connecting to power. Remove the power
lead first when disconnecting from the circuit.