Extech PRC30 Operating Manual
USER GUIDE
Multifunction Process Calibrator
Model PRC30
Introduction
Thank you for selecting the Extech Model PRC30. This device is shipped fully tested and calibrated
and, with proper use, will provide years of reliable service. Please visit the Extech Instruments
website (www.extech.com) to check for the latest version of this User Guide. Extech Instruments is
an ISO-9001 certified company.
Safety
International Safety Symbols
This symbol, adjacent to another symbol or terminal, indicates the user must refer to the
manual for further information.
This symbol, adjacent to a terminal, indicates that, under normal use, hazardous voltages
may be present
Double insulation
Safety Notes
Do not exceed the maximum allowable input range.
Turn the unit OFF when the device is not in use.
Remove the batteries if the device is to be stored for longer than 60 days.
Never dispose of batteries in a fire. Batteries may explode or leak.
Never mix battery types. Always install new batteries of the same type.
Cautions
Improper use of this meter can cause damage, shock, injury or death. Read and understand
this user manual before operating the meter.
Always remove the test leads before replacing the battery.
Inspect the condition of the test leads and the meter itself for any damage before operating the
meter. Repair or replace any damage before use.
If the equipment is used in a manner not specified by the manufacturer, the protection provided
by the equipment may be impaired.
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Meter Description
1. AC adaptor input jack
2. Display
3. Power ON/OFF
4. Source output adjustment arrow buttons
5. Set button
6. Unit button (thermocouple type, °F or °C)
7. I/O button
8. MEM (memory STEP button)
9. Backlight/ZERO button
10. Input/Output jacks and Thermocouple mini-connector
Display Layout
1. SOURCE mode icon
2. ZERO function status icon
3. Thermocouple type
4. MEASURE mode icon
5. Loop Power icon
6. Auto Power OFF active icon
7. Battery status icon
8. Measure mode value
9. Measure mode units icon
10. Datalogger memory location
11. Source mode value
12. Source mode units icon
13. Cold Junction Compensation (CJC) circuit status (ON or OFF)
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Keypad Descriptions and Operation
POWER BUTTON and AUTO POWER OFF FEATURE
1. Use the POWER button to turn the unit ON or OFF. When the unit is powered up, a short
self-test will ensue after which the display will stabilize.
2. When the battery symbol flashes on the display, replace the battery as soon as possible.
Low battery power may cause inaccurate readings and erratic meter operation.
3. This instrument is equipped with Auto Power OFF which turns the meter off after 10 minutes
of inactivity. To override this feature; press and hold the POWER button until the display
icon “ATP” turns off.
UNIT BUTTON
Momentarily press the UNIT button to select °F or °C in the temperature function, to select mA or %
in the current function or to select mV/V in the voltage function (voltage is autoranging in the
MEASURE mode)
TYPE BUTTON
Press and Hold for 1 second the TYPE/UNIT button to change the thermocouple type (J, K, T, E, C,
R, S, N or mV) in the temperature function.
I/O BUTTON
Momentarily press the I/O button to select either SOURCE (output) or MEASURE (input).
MODE BUTTON
Press and Hold the MODE / I/O button for 1 second in the MEASURE mode to select the
measurement function (temperature, voltage, current, or current with loop power).
CJC ON/OFF
In the temperature function, simultaneously press the IO and MEM buttons to turn the CJC (cold
junction compensation) on or off. The CJC icon will indicate the status.
Note: CJC should normally be ON.
(Backlight) BUTTON
Momentarily press the Backlight button to turn the backlight on or off.
ZERO (
In the MEASURE mode, Press and Hold the ZERO (
) BUTTON
) button for 1 second to zero the meter.
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