Rotary Switch And Pushbutton Overview - Urrea UD112 Manual De Usuario

CMRR (Common Mode Rejection Ratio)
Common mode voltage is voltage existing
on both the COM and Voltage input
terminals of a DMM, with respect to ground.
CMRR is a DMM's ability to reject common
mode voltage effect which can cause digit
rattle or offset in voltage measurements.
The Meter has a CMRR specification of >
60dB at DC to 60 Hz in AC voltage measuring
function and > 120 dB at DC, 50Hz and
60Hz in DC volts voltage measuring.
Load Voltage
Load voltage is a voltage drop across the
input terminals of a current-measuring
device, caused by internal shunt resistance.
Load voltage contributes to a measurement
error, and should be as low as practical.
Temperature Coefficient
Temperature Coefficient is a factor used
to calculate the change in indication or
output of an instrument with changes in
temperature. Uncompensated changes in
temperature contribute uncertainty by an
amount determined by the temperature
coefficient to instrument.
4. ROTARY SWITCH AND PUSH-
BUTTON OVERVIEW
Turning the Meter On
To turn the meter on, turn the rotary switch
from OFF to any switch setting.
Rotary Switch
Turn the meter on by selecting any
measurement function. The meter presents
a standard display for that function (range,
measurement units, on screen menu bars,
etc.). The display may also be influenced by
some of the choices made in on screen menu
selection.
Use the on screen menu selection buttons to
select any rotary switch alternate function.
You can also use other buttons to choose
modifiers for the selected function.
When you turn the rotary switch from one
function to another, a display for the new
function appears. Button choices made in
one function do not carry over into another
function.
Turns the meter off.
(Model UD179).
Volts AC rms and Volts DC.
(Model UD112).
Volts AC.
Model UD112).
Volts DC.
Access to resistance measuring, continuity
test and diode test.
Frequency measuring.
Duty- cycle is also displayed if it is toggled by
the Hz / Duty button.
Capacitance measuring.
Temp
(Model UD179 only).
Temperature measurement in Centigrade or
Fahrenheit degrees.
Changing the reading mode preset only at
the factory.
Micro-amps AC rms and micro-amps DC
measurements (Model UD179).
E N G L I S H
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