Operation Overview; Measurement Modes - Extech Instruments CT80 User Manual

Operation Overview

The CT80 AC Circuit Load Tester can test outlets or circuits under load in a matter of seconds for
proper wiring, reverse polarity, and the presence of a ground. The CT80 uses a simple menu-driven
display to allow the user to quickly see line voltage, voltage drop under full load, ground-to-neutral
voltage, and line impedance. The GFCI and AFCI testing utility is performed separately per UL-
1436, disrupting the flow of electricity if a functioning GFCI or AFCI is present.
Notes:

To avoid the buildup of heat during load testing, allow at least 20 seconds to elapse between
tests. In addition to the safety benefits, this will allow the meter to maintain its stated
accuracy during repeated tests. The meter will switch off automatically if an over-
temperature condition exists; the meter will automatically switch on when the temperature
cools to an acceptable operational range.

The CT80 is a microprocessor controlled device that prioritizes its tasks; taking a reading
and analyzing the results are its top priorities. This is the reason that the keypad may not
respond immediately to a key-press. The internal computer places a higher priority on
completing a test than on recognizing a keystroke. To minimize this effect, press and hold a
key until the display menu changes.
Warning: To avoid damage to the instrument, do not use this device on the output of a UPS
system, a light dimmer, or a square wave generator.
Warning: Use only the supplied power/test cord with this equipment
Interpreting Measurement Results

Measurement Modes

There are the four (4) measurement modes available. These are:
1. Voltage (V)
2. Voltage drop (Vd)
3. ASCC (Available short circuit current)
4. Impedance (Z)
These measurement modes are shown on the upper left side of the display. Use the ▼ button to
scroll through the mode list. Measurement results are shown on the main Wiring Configuration icon
located on the upper right of meter display in conjunction with the two LED status indicators located
above the down arrow button. Interpreting the measurement results is covered in the following
sections.
Measurement Results Coding
The three circles on the wiring configuration icon in conjunction with the two rectangular LED status
indicators are coded to indicate the test result such as for correct wiring, reverse polarity wiring, and
'no ground' condition. The wiring configuration icon and the LEDs change appearance (clear, solid,
flashing) to indicate the measurement results. The test results coding and a legend for interpreting
the codes are provided below.
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CT80-EN V1.1 08/12