Continuity tEStER LED/ BEEP type Ct5
Continuity TESTER
Type CT5
User’s manual
CT5 continuity tester, is specially designed for technicians and installers. It emits a double beep and light
signal proportional to the electrical resistance.
Its main advantage over the use of multimetre is that its measuring range reaches mega ohms (MΩ),
which is particularly useful in many applications, such as :
• Diode polarity.
• Capacitors testing.
• Checking, derivation and stamping of cables and electric motors.
• Inductances and transformers.
• Water level and humidity detection.
It has a back clip for easy transport and handling.
Application field
• Coils
• Electrical panels
• Automobile
• Electronics
• Appliances
• Home
• Industry
CT5 emits an acoustic and luminous signal (led) proportional to the
magnitude of the measure :
- If the resistance value is very big, it produces a low sound and a
slow flash.
- If the resistance value is small, the computer emits a sharp beep
and continuous and rapid flashes, getting to stay on.
- The LED can stays on, if the resistance value is very small.
1. LED measurement light
3. Speaker
5. Probes
6. Battery case
CT5 is manufactured and tested according to voltmeter standards. To keep it in use and
work in security, read and respect the following instructions.
In order to avoid electrical shock, the valid safety and VDE regulations regarding excessive contact voltages must receive utmost attention when working with voltage exceeding
120V (60V) DC or 50V (25V) AC. The values in brackets are valid for limited ranges (as for
example medicine and agriculture).
Prior to measurement ensure that the electrical cord and the test instrument are in perfect
condition. And that the batteries are charged.
When using this instrument, only the handles of the probes may be touched, do not touch
the probe tips.
This instrument may only be used within the ranges specified and within low voltage
systems up to 30 V. If the tension is higher, CT5 is protected by replaceable fuse.
CT5 can not be use to measure voltage (neither AC nor DC). If accidentally probes are
connected to powered ligne, the fuse blows, and you have to replace it to keep testing.
If the operator’s safety cannot be guaranteed, the instrument must be removed from service
and protected against use.
Safety can no longer be insured if the instrument :
- shows obvious damage
- does not carry out the desired measurements
- has been subjected to mechanical stress during transport
- has been stored for too long under unfavorable conditions
- has worn batteries
Technical data
<10 MΩ (10Hz to 10kHz)
Current between probes
10 mA
9V, 6F22 (not included)
Resistance range
Instruction for use
To test the continuity of coils, conductors, contacts... connect the two probes to the item to be
measured :
- In the absence of electrical contact between the probes, the device emits no signal.
- In case of electrical contact, it emits a sharp beep.
- A very low sound indicates poor contact due to current leakage or malfunction caused by humidity.
Diodes Test
Apply the probes to each bit of the diode :
- CT5 emits a sound in only one way : the diode is correct
- CT5 emits a sound in both way or no sound : the diode is defective
Capacitor test.
Apply the probe on each capacitor’s terminal
If the capacitor is in load, CT5 emits an increasingly low sound.
On big size condensator, there is no sound, because the voltage is not high enough to load the
Humidity test
For wells and boreholes, attach one point to earth and the other to a long cable suspended in the well.
When the wire end reaches the surface of the water, the tester beeps. The wetter is the surface,
the sharper is the sound (walls, floor, wood, grain, etc.)
Motor test
To check the condition of an electric motor, perform a measurement between each phase and the
motor’s housing or ground. If the CT5 transmits an acoustic signal one of the phases has a short to
In triphase motors it is possible to perform a measurement between the terminals of each phase. CT5
emets a sound signal based on the number of turns of the coil of each phase. Signals must be
identical. A different sound indicates a short in the measured coil.
If there is continuity between one of the phases and the motor housing, there is a short between this
phase and the motor housing.
Transfomers test
Connect the CT5 tester to the terminals of an inductor (or coil), it emits an acoustic signal sharper
than usually issued by connecting the two probes together. Similarly, placing the probes
to the terminals of a transformer, CT5 can emit a signal sharper than usual.
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