Meter Description; Operation - Extech Instruments 422123 User Manual

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
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.

Operation

Powering the meter
1. Select a means of powering the unit (9V battery, external pack, or optional AC
adapter). The AC Adapter is recommended for heavy usage. 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.
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.
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
following keys:
The '1' key for 4-20mA output
The '2' key for 0-20mA output
The '3' key for the 0-24mA output
5. Enter a mA output using the numeric keys (for example, press '5', then ENTER to
output 5mA). Note that the 5-digit LCD can only accept 5 digits.
6. If the circuit under calibration opens or if the load that the meter is driving is greater
than 1000Ω, the meter will display the OL (overload) alarm warning and a series of
alarm tones will sound.
nd
functions on keypad)
3
Model 422123 Ver. 1.1 April 2001