Extech 422123 Operating Manual

User's Manual

Precision Multifunction Calibrator
Model 422123

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

nd

5. SHIFT button (activates 2

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).

functions on keypad)

025

%

Hz

°C

TJK

V

E

3

4

5

6

5

6

1

SHIFT

2

1

2

3

4

2

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Operation

Powering the meter

1. Select a means of powering the unit (9V battery, external pack, or optional AC
adapter). The 9V battery compartment is located on the rear (bottom) of the meter
secured by one Phillips head screw. The AC adapter and the External Battery Pack
plug into the DC12V jack located on the back of the meter just above the tilt stand. The
Battery Pack holds six 1.5V 'AA' batteries. The optional AC Adapter is recommended
for heavy usage.

2. Press the red ON/OFF button to turn the meter ON.

3. Wait until the STANDBY display extinguishes before using the meter.

4. To turn the meter OFF, press the red ON/OFF button again.

Note: The 422123 calibrator will begin to output the desired
signal after the user presses ENTER or immediately after the
fifth digit has been entered.

DC Milliamp Outputs (4 to 20, 0 to 20, and 0 to 24mA)

1. Ensure that the meter's test leads are not shorted or connected to any devices.

2. Slide the function switch to the mA position and wait for the STANDY display to
extinguish.

3. Connect the meter's red (positive) and black (negative) test leads to the device or
circuit under calibration. Use banana-to-alligator leads if necessary.

4. Select the desired mA output range by pressing the SHIFT button and then one of the
current output keys:

4-20mA output
0-20mA output
0-24mA output

5. Enter a mA current output using the numeric keys (for example, press '5') then ENTER
to output 5mA or press 5.0000. Note that the 5-digit LCD can only accept 5 digits.

6. If the circuit under calibration is open or if the load that the meter is driving is greater
than 1000Ω, the meter will display the OL (overload) alarm warning and will emit a
series of beeps.

3

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