V3.0 5/09
2
025
%
Hz
V
°C
TJK
E
SHIFT
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Introduction
Congratulations on your purchase of the Extech 422123 Precision Multifunction Calibrator.
This device can source mA, mV, V, Temperature (°C/°F) and Frequency. This device also
offers STEP and AUTO RAMP features. Careful use of this meter will provide years of
reliable service.
Meter Description
1. 5-digit LCD display
2. Numeric and Function Keypad
3. Thermocouple input jack
4. Power ON/OFF key
5. SHIFT button (activates 2
nd
functions on keypad)
6. Function Switch
NOTE: The battery compartment, tilt stand, and
AC Adapter/External Battery Pack input jack
are located on the rear of the meter.
Keypad Function Commands
1. Select output range for current
mode
2. Select output range for voltage
mode
3. Automatic Ramp Function
(current and voltage only).
4. Select output in % (current and
voltage only).
Also the “–“ key for negative
values.
Also the decimal point.
5. Select temperature units and
thermocouple type.
6. Step function up and down
(current and voltage only).
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