MARTINDALE MM84 Bedienerhandbuch PDF herunterladen (Seite 3)

3.10 AC & DC Current Measurement

Connect the black test lead to the COM terminal and the red test lead

to the μA mA or 20A terminal depending on the magnitude of current

to be measured.

Set the rotary switch to either

and the required range.

Taking all necessary safety precautions connect the test leads in

series with the circuit being measured and read the measured current

from the display.

3.11 Resistance Measurement

Connect the black test lead to the COM terminal and the red test lead

to the

%HzV: terminal.

Set the rotary switch to : and the required range.

Taking all necessary safety precautions connect the test leads to the

circuit being measured and read the measured resistance from the

display.

3.12 Frequency Measurement

Connect the black test lead to the COM terminal and the red test lead

to the

%HzV: terminal.

Set the rotary switch to Hz and the required range.

Taking all necessary safety precautions connect the test leads to the

circuit being measured and read the measured frequency from the

display.

3.13 Duty Cycle Measurement

Connect the black test lead to the COM terminal and the red test lead

to the

%HzV: terminal.

Set the rotary switch to DUTY%.

Taking all necessary safety precautions connect the test leads to the

circuit being measured and read the measured % duty cycle from the

display.

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3.14 Continuity Testing

Connect the black test lead to the COM terminal and the red test

lead to the

%HzV: terminal.

Set the rotary switch to

Taking all necessary safety precautions connect the test leads to

the circuit being tested.

The buzzer will sound if the resistance is <150:.

3.15 Diode Testing

If the diode to be tested is in circuit be sure the circuit power is

switched off.

Connect the black test lead to the COM terminal and the red test

lead to the

%HzV: terminal.

Set the rotary switch to

Taking all necessary safety precautions connect the test leads to

the diode being tested.

If the diode is good a forward bias will give a display reading of

around 0.6V (silicon diode) and a reverse bias will give a display of

OL. If the diode is shorted or open circuit the display will indicate

approx 0V or OL respectively for both forward and reverse bias.

3.16 Logic Testing

Connect the black test lead to the COM terminal and the red test

lead to the

%HzV: terminal.

Set the rotary switch to

LOGIC. The LCD will display LOGIC.

Taking all necessary safety precautions connect the test leads to

the circuit being tested.

A logic 0 (Lo) will be indicated by a

on the display.

A logic 1 (Hi) will be indicated by a

on the display and the MM84

buzzer will sound.

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4. MAINTENANCE

4.1 Battery Replacement

To avoid shock or injury, disconnect the multimeter from any

external circuits or components and remove the test leads before

proceeding.

The battery is replaced by removing the rear casing of the MM84.

The rear casing is secured to the front by 3 screws and two internal

snaps at the LCD end.

Remove the rear casing by removing the three screws from the rear

casing. Gently lift the input terminal end of the rear casing until it

unsnaps from the casing top.

Fit a new 9V, NEDA 1604, JIS006P, IEC 6F22 battery observing

correct polarity.

NOTE: It is essential to transfer the protective insulating sleeve from

the old battery to the new battery.

Replace the rear casing by snapping it into position and re-install

the three screws.

4.2 Fuse Replacement

To avoid shock, injury or damage to the multimeter, disconnect

the multimeter from any external circuits or components and remove

the test leads before proceeding.

Replace only with the fuse speciﬁ ed.

The fuses are replaced by removing the rear casing of the MM84.

Follow the procedure of section 4.1 (Battery Replacement) to

remove the rear casing.

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Replace F1 only with the original type F500mA/600V, fast acting

ceramic fuse and replace F2 only with the original type F20A/600V

High Energy, fast acting ceramic fuse.

Replace the rear casing and screws.

4.3 Test Lead Replacement

If the test leads become damaged they should be replaced.

The replacement test leads must have the same (or better)

overvoltage category rating as the TL16 leads supplied.

4.4 Calibration

To maintain the integrity of measurements made using your

instrument, Martindale Electric recommends that it is returned

at least once a year to an approved Calibration Laboratory for

recalibration and certiﬁ cation.

Martindale Electric is pleased to offer you this service. Please

contact our Service Department for details.

Email: service@martindale-electric.co.uk

Tel: 01923 650660

4.5 Cleaning

The unit may be cleaned using a soft dry cloth. Do not use moisture,

abrasives, solvents, or detergents, which can be conductive.

4.6 Repair & Service

There are no user serviceable parts in this unit other than those that

may be described in section 4. Return to Martindale Electric if faulty.

Our service department will quote promptly to repair any fault that

occurs outside the guarantee period.

Before the unit is returned, please ensure that you have checked the

unit, fuses, test leads and battery.

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