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5. Operation

WARNING
1. When measuring voltage, be sure that the instrument is not

connected or switched to the resistance range. Always ensure
that the correct terminals are used for the type of measurement
to be made.

2. Use extra care when measuring voltage above 50V, especially

from sources where high voltage is present.

3. Avoid making connections to live circuits whenever possible.
4. When making current measurements, be sure that the circuit is

not live before opening it to connect the test leads.

5. Before making resistance measurements or diode test, ensure

that the circuit under test is discharged.

6. Always ensure that the correct function and range is selected. If

in doubt on which range to use, start with the highest and work
your way down.

7. Extreme care should be taken when using the instrument in

conjunction with a current transformer connected to the
terminals if an open circuit occurs.

8. Ensure that the test leads and probes are in good condition with

no damage to the insulation.

9. Take care not to exceed the overload limits as shown in the

specifications.

10. Before opening the case of the instrument to replace the

battery, disconnect the test leads from any external circuit, set
the selector switch to the OFF position.

5-1. Check the Batteries

If the battery is weak, a “      ” symbol will appear on the right of
the display. It means that the battery should be replaced.

5-2. Front Panel Description

1

2

3

5

4

6

7

8

+

1. Liquid Crystal Display
2. Relative Measurement Button
3. Function/Rotary Switch
4. TR h

FE

Test Socket

5. 10A Input Jack

6. Common Input Jack
7. mA Input Jack
8. DC/AC Button
9. Holster

9

-8-

-9-

Содержание M-1750

Страница 1: ...onics Inc 150 W Carpenter Avenue Wheeling IL 60090 847 541 3800 http www elenco com e mail elenco elenco com OPERATOR S INSTRUCTION MANUAL M 1750 3 3 4 COUNT DIGITAL MULTIMETER Copyright 2003 ElencoTM Electronics Inc ...

Страница 2: ...re and Maintenance 12 6 1 Caring for Your Multimeter 13 6 2 Maintenance 13 WARNING PLEASE READ THIS INSTRUCTION MANUAL CAREFULLY Misuse and or abuse of this instruction cannot be prevented by any printed word and may cause injury and or equipment damage Please follow all these instructions and measurement procedures faithfully and adhere to all standard industrial safety rules and practices The mu...

Страница 3: ...aged or if you suspect that the meter is not operating properly Turn off the power to the circuit under test before cutting unsoldering or breaking the circuit Small amounts of current can be dangerous Use caution when working above 60VDC or 30VAC rms Such voltages pose a shock hazard When using the test lead keep your fingers behind the guards on the test lead Disconnect the live test lead before...

Страница 4: ...nt at which the voltage with respect to earth ground exceeds in this case 500 volts This symbol adjacent to one or more terminals identifies them as being associated with ranges that may in normal use be subjected to particularly hazardous voltages For maximum safety the instrument and its test leads should not be handled when these terminals are energized This marking indicates that equipment is ...

Страница 5: ... terminals 2 Remove the screws from the bottom case and lift the case Remove the spent batteries and replace them with batteries of the same type Fuse Replacement Remove the screws from the bottom case and lift the case Replace the fuse with the same type and rating 5 x 20mm 0 5A 250V fast blow fuse or 5 x 20mm 10 250V fast blow fuse as the replacements 3 Features 9 Functions 23 Measuring Ranges S...

Страница 6: ...ad to the COM socket and the red test lead to the VWHz socket 2 Set the selector switch to the Hz or Duty position 3 Connect the probes across the source or load under measurement 6 hFE Test 1 Set the selector switch to the desired hFE position PNP or NPN type transistor 2 Never apply an external voltage to the hFE sockets Damage to the meter may result 3 Plug the transistor directly into the hFE ...

Страница 7: ...ure that the circuit to be tested is dead Max input overload 250Vrms and 10sec 4 Capacitance Measurement 1 Before testing discharge the capacitor by shorting its leads together Use caution in handling the capacitors because they may have a charge on them of considerable power before discharging 2 Connect the black test lead to the COM socket and the red test lead to the VWHz socket 3 Set the selec...

Страница 8: ...art with the highest and work your way down 7 Extreme care should be taken when using the instrument in conjunction with a current transformer connected to the terminals if an open circuit occurs 8 Ensure that the test leads and probes are in good condition with no damage to the insulation 9 Take care not to exceed the overload limits as shown in the specifications 10 Before opening the case of th...

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