HTC CM-2070FT Посібник - Сторінка 4

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disturbance and might cause the wrong results.

4.6 DIODE AND CONTINUITY TEST

4.6.1 Set the rotary switch to "

Ω" range. The

original state is diode measurement mode. (Refer to

picture 6)

4.6.2 Forward measurement: Connect red test lead to

the positive polarity and the black test lead to the

cathode polarity of the diode. LCD will display the

approx. value of forward voltage drop.

4.6.3 Backward measurement: connect red test lead to the cathode

polarity and the black test lead to positive polarity of the diode. LCD

will display "OL".

4.6.4 The complete diode testing includes forward and backward

measurement. If the result doesn't meet the descriptions above, it means

the diode is broken.

4.6.5 Press SELECT (yellow) key to select the continuity measurement

mode.

4.6.6 Insert the black test lead into "COM" terminal, and the red one

into "V/Ω" terminal.

4.6.7 Connect test leads to two points of tested circuit, if the resistance

is less than (50±10) Ω, the buzzer sounds.

Note: DO NOT input any voltage value at this range!

7 RESISTANCE MEASUREMENT

4.7.1 Turn the function swift to "

Ω" range. Press "SELECT"

to turn to "Ω" measurement mode.

4.7.2 Insert the black lest lead into "COM" terminal and the red one

into "V/Ω" terminal.

4.7.3 Connect the test leads to the measured resistance to get the

measurement value. (Refer to picture 6)

Note:

1. Before measuring in line resistor, make sure that the power is off and

all capacitors have discharged completely.

2. Do not apply any voltage at resistance range.

3. When input terminal is in open circuit, LCD will display "OL".

4. When the test leads are shorted, there would be about 1Ω stray

resistance.

4.8 CAPACITANCE MEASUREMENT

4.8.1 Turn the function swift to "

Ω" range. Press "SELECT"

to turn to "

" measurement mode.

4.8.2 Insert the black lest lead in "COM" terminal and the red one in

"V/Ω" terminal.

4.8.3 If the LCD doesn't display "0", press "REL" to clear the reading;

4.8.4 Connect the capacitor to "COM" and "V/Ω" terminal. (Note: the

red test leads is for positive pole +). LCD displays capacitance value.

Note:

1. Don't input voltage or current to the "V/Ω/" terminal when

measuring the capacitance or the capacitor still in the "Cx" terminal.

(picture 6)

2. In order to assure the accuracy, please press "REL" to clear the

reading before testing.

3. There is only the auto range mode under the capacitance range.

4. The capacitor must be completely discharged before testing.

5. The reading of 200uF range will take more than 15 seconds to be

stable.

4.9 FREQUENCY MEASUREMENT

4.9.1 Turn the function swift to Hz range. Insert the black lest lead in

"COM" terminal and the red one in "V/Ω" terminal.

4.9.2 Connect the test leads to the measured circuit

and get the measurement value. (Refer to picture 7)

Note:

1. In noisy environment, it's better to use shield

cable to measure a low signal.

2. When measuring high voltage circuit, do not touch the high voltage

circuit;

3. Don't input voltage higher than 250V TRMS or it may damage the

meter.

4.10 TEMPERATURE TEST

4.1.11 Set the rotary switch to "℃/℉" range.

4.1.12 Insert the black plug of the thermocouple

sensor into "COM" and red one into "V/Ω" jack,

and put the working terminal (temperature

measuring end) of thermocouple on the surface or

inside the object to be tested. Then you can read

temperature from the screen, and the data is in

Centigrade. (Refer to picture 8)

Note:

1. The meter should be far away high temperature. Use the

thermocouple probe within the specified temperature range.

2. Don't change the temperature probe randomly, or the accuracy will

not be guaranteed.

3. Don't input voltage at temperature range.

4.11 AUTO POWER OFF

4.11.1 The meter will auto power off if there is not any operation in 15

minutes and come into dormant mode. The beeper will sound five times

within 1 minute before power-off.

To restart the meter, please press any function key or turn to the

function swift.

4.11.2 Press "SELECT" key and turn on the meter or press "SELECT"

when the meter is in dormant mode to wake up the meter and the

"AUTO POWER OFF" function will be cancelled

5. MAINTENANCE

The meter is a precise instrument. Random changes to the circuit should

be avoided.

Note:

1. When the LCD displays "

", please exchange the battery in time.

2. Before replacing battery or fuse, please remove the test leads from

the measuring point and turn off the power.

3. Keep the meter away from water, dust and shock.

4. DO NOT use the meter under high temperature, high humidity,

combustible, explosive and strong magnetic environments.

5. Clean the case of the meter regularly with cleaner. DO NOT use

corrosive solvents.

6. TROUBLE SHOOTING

If the meter does not work properly, please check the meter as

following steps:

(If the problems still cannot be solved, please refer to repairing center

or contact the local dealers.)

Fault

No reading on LCD

signal appears

No current or temperature input

Big error Value

Solution

Turn on the power

Replace battery

Release the HOLD key

Replace battery

Replace fuse

Replace battery