Test-products-international 275 Manual do Utilizador descarregar pdf (Página 22)

Measuring DC Microamps

CAUTION!

Do not attempt to make a current measurement with the test

leads connected in parallel with the circuit to be tested. Test

leads must be connected in series with the circuit. Do not

attempt to make a current measurement of circuits with more

than 600V present. Instrument damage and/or personal injury

may result. Make sure the temperature probe is NOT

plugged

in during this test.

Instrument set-up:

FUNC. BLACK RED MINIMUM MAXIMUM

TEST LEAD TEST LEAD READING READING

COM V/Ω /µA 0.01µA 400.0µA

Measurement Procedure:

1. Disconnect power to circuit to be measured.

2. Plug black test lead into the COM input jack.

3. Plug red test lead into the V/

ΩΩ

µµ

A input jack.

4. Set the rotary switch to the

µµ

A function.

5. Connect the test leads in series to the circuit to be

measured.

6. Reconnect power to circuit to be measured.

7. Read the current on the 275.

Optional Modes

(See Other Features Section)

• D-H: Freezes the reading on the LCD.

• MAX/MIN: Records minimum and maximum measure-

ments.

Measuring Frequency

WARNING!

Never attempt a frequency measurement with a voltage source

greater than 500V. Determine the voltage of any unknown fre-

quency source before connecting the instrument in frequency

mode. Make sure the temperature probe is NOT plugged in

during this test.

Instrument set-up:

FUNC. BLACK RED

TEST LEAD TEST LEAD

Hz COM V/Ω/µA

Measurement Procedure:

1. Disconnect power to the circuit to be measured.

2. Plug black test lead into the COM input jack.

3. Plug red test lead into V/Ω input jack.

4. Set the rotary switch to the Hz position.

5. Reconnect power to the circuit to be measured.

6. Read the frequency on the LCD.

Optional Modes

(See Other Features Section)

• D-H: Freezes the reading on the LCD.

• MAX/MIN: Records minimum and maximum measure-

ments

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