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CT44051
Инструкция по эксплуатации Страница: 6

Crown CT44051 [6/35] English 9

English

2. Long press to turn on the illuminaon funcon and the backlight at the same me. Short

press the key again to turn oﬀ the illuminaon funcon. It turns oﬀ automacally with no

operaon for 30S.

Auto power off

Aer about 15 minutes aer power on, if there is no operang instrument, it will give audible

voice prompts, will automacally cut oﬀ the power, enter the hibernaon mode, in the automac

shutdown mode, any key can be restarted.

ACV and DCV measuremen

Do not measure any voltage greater than 600V to prevent electric shock or damage to the

instrument.

Do not apply more than 600V voltage between the common and earth to prevent electric

shock or damage to the instrument.

ACV or DCV measuring:

1. Turn the switch to or .

2. Connect the black test pen to the COM jack and the red pen to the V jack.

3. Measure the voltage value of the circuit under test with the other two ends of the test pens.

4. The reading will be shown on the LED

display as well as the polarity of the end connected with

the red lead.

Notes:

*The meter shows readings in range DCV 200mV and 2V even there is no input voltage or test

pens connecon. Then short circuit and “COM” to make the meter shows zero.

*Please change to a higher range if the “OL” is shown .

Resistance measurement

To avoid damage to the meter or device under test, all power to the circuit under test

should be cut off before measuring resistance, and

all high- voltage capacitors should

be fully discharged.

Resistor measuring:

1. Rotate the rotary switch to the proper posion.

2. Connect the black test pen and the red test pen to the “COM” input socket and input

socket 3.Uses the test pen to test the resistance value of the circuit.

4. The resistance value shows on the display window .

Notes:

*The resistance value measured on the circuit is usually diﬀerent from the resistance rang.

*To measure the low resistance accurately, please short-circuit the two test pens to read out the

short-circuit resistance of the test leads, and subtract it by the readings to get accurate resistance

value.

*At 20megohms range, the reading will stabilize aer a few seconds, which is normal for high

resistance mea

surements.

*When the meter is not in circuit, the display will show “OL”, indicang that the measurement

value is out of the measurement range.

Diode measurement

To avoid damage to the meter or device under test, all power to the circuit under test

should be cut off before measuring diode, and all high- voltage capacitors should be fully

discharged.

Test a diode outside the circuit.：

1. Turn the rotary switch to posion.

2. Connect the black test pen and the red

test pen to the “COM” input socket and “ V/Ω” input

socket

3. Connect the black test pen and red test pen to the negave and posive electrodes of the

diode under test.

4. The meter will display the forward bias value of the diode under test. If the polarity is reversed,

then it shows ‘OL’ .

The normal diode in the circuit sll produces a forward voltage drop of 0.5V to 0.8V, but the

reverse bias reading will depend on the variety of the resistance value of the

other channels

between the two test pens.

Buzzer test

To avoid damage to the meter or device under test, all power to the circuit under test

should be cut off before measuring on- off of the circuit and all high- voltage capacitors

should be fully discharged.

For on-off state of the circuit:

1. Turn the rotary switch to posion.

2. Connect the black test pen and the red test pen to the “COM” input socket and input

socket

3. Measure the resistance of the circuit under test at the other end of the test pens. If the

resistance of the circuit under test is not greater than about 30 ohms, the indicator light will turn

on and the buzzer will sound connuously.

Crown CT44051 [6/35] English 9

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