Zotek ZT-C4 [2/2] 5 7 8 6
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Zotek ZT-C4 [2/2] 5 7 8 6

Zotek ZT-C4 [2/2] 5 7 8 6
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E. General Maintenance
Beyond replacing batteries and fuses, do not attempt to repair or service the
product unless you are qualified to do so and have the relevant calibration,
performance test, and service instructions.
(1) Do not operate the product around hot, wet, flammable, explosive or magnetic
environments.
(2) Clean the product with damp cloth and mild detergent; do not use abrasives or
solvents.
(3) Remove the input signals before you clean the product.
(4) Remove the batteries if you will not use the product for a long time to prevent
possible battery leak.
(5) When “ ” is shown on the display, batteries shall be replaced as below:
1. Loosen the screw and remove the battery cover;
2. Replace the used batteries with new batteries of the same type;
3. Place the battery cover back and fasten the screw.
(6) Replace fuses as above steps. Use only fuses of the same type as the original
ones.
(3) Measure AC/DC Current
1. Connect the black test lead to the COM Terminal and connect the red test lead
to the Terminal or the 10A Terminal (choose based on the value of
current) ;
2. Turn the rotary switch to the Current-A Mode or the Current-mA Mode;
3. Press SELECT to toggle between AC/DC;
4. Break the circuit path to be measured. Then connect the test leads across the
break and apply power;
5. Read the measured current on the display.
*Caution:
a. Do not measure current that exceeds the MAX Value as indicated in the
Specifications;
b. Use the 10A Terminal and the Current-A Mode when you are measuring an
unknown current. Then switch to the Terminal and the Current-mA
Mode if necessary.
(4) Measure Resistance
1. Connect the black test lead to the COM Terminal and connect the red test lead to
the Terminal;
2. Turn the rotary switch to the Resistance Mode, and the display will show “OL”;
3. Touch the probes to the desired test points of the circuit to measure the resistance;
4. Read the measured resistance on the display.
*Caution:
a. Disconnect circuit power and discharge all capacitors before you test resistance.
b. Do not input voltage at the Resistance Mode.
(5) Measure Continuity
1. Connect the black test lead to the COM Terminal and connect the red test lead to
the Terminal;
2. Turn the rotary switch to the Resistance Mode, press SELECT once to toggle to the
Continuity/Diode Mode;
3. Touch the probes to the desired test points of the circuit;
4. The built-in beeper will beep when the resistance is lower than 50Ω, which
indicates a short circuit.
*Caution:
a. Do not input voltage at the Continuity Mode.
(6) Measure Diode
1. Connect the black test lead to the COM Terminal and connect the red test lead to
the VΩHz Terminal;
2. Turn the rotary switch to the Resistance Mode, press SELECT once to toggle to the
Continuity/Diode Mode;
3. Connect the red probe to the anode side and the black probe to the cathode side
of the diode being tested;
4. Read the forward bias voltage value on the display;
5. If the polarity of the test leads is reversed with diode polarity or the diode is
broken, the display reading shows “OL”.
*Caution:
a. Do not input voltage at the Diode Mode.
b. Disconnect circuit power and discharge all capacitors before you test diode.
(7) Measure Frequency
1. Connect the black test lead to the COM Terminal and connect the red test lead to
the VΩHz Terminal;
2. Turn the rotary switch to the Frequency Mode;
3. Touch the probes to the desired test points of the circuit;
4. Read the measured frequency/duty cycle value on the display.
*Caution:
a. The Frequency Mode only applies to measure high frequency with low voltage.
(8) Measure Temperature
1. Connect the black thermocouple probe to the COM Terminal and connect the
red thermocouple probe to the Terminal;
2. Turn the rotary switch to the Temperature Mode, and the display will show the
room temperature, to toggle between ℃/℉, press SELECT button;
3. Touch the probes to the desired test points;
4. Read the measured temperature on the display.
*Caution:
a. Do not input voltage at the Temperature Mode.
(9) Test NCV
1. Turn the rotary switch to the NCV Mode;
2. Hold the product and move it around, the built-in beeper will beep when the inner
sensor detects AC voltage nearby. The stronger the voltage is, the quicker the
beeper beeps.
NCV Secondary function
Put the red probe into the VΩHz terminal, then use the black probe to touh the live
line and Null line of the Main supply. You can judge the L-line or N-line by the beeps,
If you can hear the strong beeps,this is the L-line, or it's a N-line.
(10) Auto Power Off
1. The product automatically powers off after 15 minutes of inactivity;
2. The built-in beeper beeps 5 times 1 minute before power off;
3. To restart the product, press SELECT button;
4. To disable the Auto Power Off function, hold down the SELECT button when
turning on the product, you will hear three beeps if you have successfully disabled
the function.
Warning：
1. Do NOT exceed the “maximum value” indicated in the Specification;
2. Do NOT input voltage at the Current Mode, the Resistance Mode, the Diode
Mode, the Continuity Mode, or the Temperature Mode;
3. Do NOT use the product when the batteries or the battery cover is not placed
properly;
4. Turn off the product and remove the test leads from the test points before
changing batteries or fuses.
F. Troubleshooting
If your product do not function as normal, the following steps may help you. If the
problem still cannot be solved, please contact your dealer.
Problem Possible Reason
Display Malfunction
Low battery; replace batteries
Symbol
Replace batteries
No current input
Replace fuse
LIMITED WARRANTY
AND LIMITATION OF LIABILITY
Customers enjoy one-year warranty from the date of purchase. This warranty
does not cover fuses, disposable batteries, or damage from accident, neglect,
misuse, alternation, contamination, or abnormal conditions of operation or
handling.
All rights reserved. Specifications are subject to change without notice.

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