CT70 V7.0 09/10
4
Operation Overview
The CT70 AC Circuit Load Tester can test outlets or circuits under load for proper wiring,
reverse polarity, and the presence of a ground. The CT70 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 testing utility is performed separately per
UL-1436, disrupting the flow of electricity if a functioning GFCI is present.
Note: 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.
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 (CT70-AC) with this equipment
Interpreting Measurement Results
Important note:
The CT70 is a microprocessor controlled device that prioritizes its tasks.
Taking a reading and analyzing the results are its top priorities. This is why, at times, the
keypad may not respond immediately. 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.
In addition to the main Wiring Configuration icon, shown on the meter display, the
measurement modes are accessed using the four (4) menu items shown on the left side of
the display. The menu items are:
1. Voltage (V)
2. Voltage drop (Vd)
3. ASCC (Available short circuit current)
4. Impedance (Z)
Use the
▼
button to scroll the menu list.
The wiring configuration screen shows correct wiring, reverse polarity wiring, and ‘no
ground’ conditions. The three circles on the wiring configuration icon indicate the wiring
status. The circles are coded, changing appearance (clear, solid, and flashing) to indicate
the measurement results. A table is provided below for interpreting the circle code.
Blue Display
Red Display
Red Display
Blank Display
