Extech CT40 Operating Manual
User's Guide
Cable Tester and Digital
Multimeter
Model CT40
Introduction
Congratulations on your purchase of the Extech CT40. This meter is shipped fully tested
and calibrated and, with proper use, will provide years of reliable service.
cable tester which uses a transmitter/receiver to allow for wire identification of an individual
core to the end of a multi-core cable .The meter’s digital multimeter functions provides for
easy measurement of AC/DC Voltage, AC/DC Current, Resistance, Continuity and Diode
check.
The CT40 is a
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
Safety Notes
Warnings
Double insulation
• Do not exceed the maximum allowable input range of any function.
• Set the function switch OFF when the meter is not in use.
• Remove the battery if meter is to be stored for longer than 60 days.
• Set function switch to the appropriate position before measuring.
• Do not measure current on a circuit whose voltage exceeds 600V.
• When changing ranges always disconnect the test leads from the circuit under test.
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.
• Use great care when making measurements if the voltages are greater than 25VAC
rms or 35VDC. These voltages are considered a shock hazard.
• Voltage checks on electrical outlets can be difficult and misleading because of the
uncertainty of connection to the recessed electrical contacts. Other means should be
used to ensure that the terminals are not "live".
• If the equipment is used in a manner not specified by the manufacturer, the protection
provided by the equipment may be impaired.
2
CT40 V1.3 09/09
Meter Description
1. Low Battery Indicator -Receiver
2. Receiver Alligator Test Leads
3. Operation Indicator -Receiver
4. On/Off Switch -Receiver
5. Hold Switch – Digital Multimeter Mode
6. DMM Input Jacks
7. Max Button – Digital Multimeter Mode
8. Mode Button – Digital Multimeter Mode
9. LCD Display – Multimeter Mode
10. Rotary Switch – Multimeter Mode
11. ID Test Button –Continuity Beep Test
12. V Check Button – Cable Voltage Check
13. LCD Display for Cable Identifier Function
14. Operation Indicator- Transmitter
15. Low Battery Indicator –Transmitter
16. On/Off Switch – Transmitter
17. Transmitter Alligator
Test Leads – CH1-16
LCD display descriptions
1. Cable ID Number Display
2. Low bat LED
3. OP operation LED
4. Autorange Indicator
5. Diode Test
6. Continuity
7. Display Hold
8. Max
9. Low Battery Indicator
10. Units
11. DMM Digit Display
12. AC/DC Indicators
2
1
13
12
11
10
9
8
7
1
14
3
4
5
6
LO BAT
15
16
17
2
OP
3
7
5
6
4
8
9
12
10
11
3
CT40 V1.3 09/09
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