Extech CT20 Manual

Extech Måling CT20

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User's Guide

Continuity Tester Pro

Model CT20

Introduction

Congratulations on your purchase of the Extech CT20 Continuity Tester Pro.

The CT20 allows a single user to quickly identify and label two wires even

when the wire ends are located in different rooms. This tester is shipped fully

tested and with proper use will provide years of reliable service.

Safety

CAUTION: DO NOT CONNECT TO A LIVE CIRCUIT

Safety Precautions

1. Improper use of this tester can cause damage, shock, injury or death.

Read and understand this user’s guide before use.

2. Ensure that the battery door is properly closed and secured before use.

3. Inspect the condition of the test leads and the tester itself for any damage

before use.

4. Remove the battery from the tester if it is to be stored for a long period.

Description

1. Local Continuity Tester (main pulsing unit)

2. Local Continuity Indicator (flashing

red LED)

3. Power On/Off (mini-slide switch)

4. Power “On” Indicator (steady green

LED)

5. Local Continuity Beeper (with air

holes on rear of case)

6. Remote Probe Continuity Indicator

(red/green bi-color LED)

7. Remote Probe Holder (side

mounted plastic piece)

8. Red and Black Remote Probe

Leads w/alligator clips

9. Red and Black Tester Leads w/alligator

10. 9 Volt Battery Compartment (removable cover on rear)

Specifications

Power supply 9 Volt Battery

Beeper 85dB beeper

Battery life Approx. 12 months with normal use.

Continuity confirmation Equal to or less than 2.0 K Ohms

Continuity drive current: Pulsed (2.0 Hz) 20 - 50mA at 10 Ohms and 2.0mA -

8.0mA at 1000 Ohms.

Wire Verification Distance 10,000 Ft, 3,000 m (26 Gage min.)

Fuse 250V 0.5A fast blow

Operating Temperature 10

F to 113

F (-12 to 45

Storage Temperature -4 to 176

F (-20 to 80

Operating Humidity 10 to 90% RH (non-condensing)

Dimensions 3.6 x 2.2 x 1.14” (90 x 57 x 29mm)

Weight 9.2oz (260g)

Operation

CAUTION: DO NOT CONNECT TO LIVE WIRES.

Use only on non-energized circuits

Remote Continuity

Remote continuity is a different mode of usage for the Tester and requires the

Remote Probe. This mode is primarily used for: A. remote verification of continuity

for cable/wires, or

B. individual cable/wires for identification and labeling. Properly used, the Tester

with Remote Probe will eliminate numerous trips when testing cable TV, electrical

cables, and speaker/telephone wiring in multi-room/multi-floor installations.

1. Turn power on. The green

power LED will glow. If green

LED fails to light replace 9V

battery.

2. Attach red and black alligator

clips of Tester to one end of

cable/wires under test.

3. Proceed to the other end of the

cable/wires and connect them

to Remote Probe test leads.

4. If continuity exists, the LED on

the probe will flash either green

or red depending on the Probe

leads orientation. Note: At this point, Tester hanging

on cable/wires at origination end, will beep and flash

red while remote probe (with user) at destination end

is verifying continuity.

5. When Tester (red lead) is connected through wire

under test to Remote Probe (red lead) and Tester

(black lead) is connected through wire under test to

Remote Probe (black lead), then Probe LED flashes

green indicating correct connection orientation. If

Probe LED flashes red, this indicates Probe Leads are

not correctly connected. Reverse probe leads to

produce green light.

6. Once correct orientation has been achieved

(flashing green LED), then wires under test can be

labeled consistent with the colors on tester and

probe leads.

Advanced Remote Continuity and Wire Identification

The Remote Continuity mode can be used to check continuity and to identify two,

three or more cables/wires simultaneously by applying simple logic and a testing

strategy. To facilitate cable/wire identification, the leads of the tester and probe use

matching color

Local Continuity

Using just the tester (without probe) you

can easily test any in-wall wiring from

point to point locations in the same

room. Other handy uses are to quickly

test light bulbs, fuses, switches, relay

contacts, diodes, low ohm power

resistors, circuit breakers, etc. for

electrical continuity.

1. Turn power switch on. The green

power LED will glow. If green LED

does not light, replace 9V battery.

2. To check same room wiring runs, attach both red and black alligator clips of

Tester to both wires on one end of multi-wire cable under test and let Tester

hang from wires.

3. Go to other end of same cable and momentarily connect wires in cable

together. The Tester will beep and red LED will flash indicating continuity.

4. When continuity is found, label both ends of cable with the same number or

name.

5. To test other devices (listed above) connect Tester leads to device terminals in

any* lead orientation (red or black). If device makes internal electrical

connection then Tester will beep and its red LED will flash indicating continuity.

*Exception: When testing a diode, the red Tester lead is positive and will show

continuity when connected to the anode (positive (+) side) with black Tester lead

to cathode (negative (-) side).

Battery replacement

1. Loosen Phillips head screw of battery compartment and remove

cover (rear).

2. Replace 9 volt battery and compartment cover, then tighten

screw.

Disposal

Follow the valid legal stipulations in respect of the disposal

of the device at the end of its lifecycle

CT20 V4.0 11/06

Produkt Specifikationer

Mærke:	Extech
Kategori:	Måling
Model:	CT20

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