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‹

  Auto or manual ranging

‹

 Auto power off

2.3 Accessories

The MM94 comes with the following accessories:

‹

  TL16 test leads

‹

  TT1P Type K thermocouple 

‹

  9V PP3 battery (Installed)  

‹

 Instructions

3. OPERATION

3.1 General

If the magnitude of a parameter to be measured is uncertain, but 
known to be within the maximum safe limits of the electrical tester, 
manually set the range to maximum. E.g. If measuring AC voltage 
and the voltage magnitude is unknown, set the range to 750 V, 
then if required select the correct range for a satisfactory reading.

If the insulation clamp meter displays 

OL

 or 

-OL

 then the 

measurement limits of the range have been exceeded.

3.2 Low Battery Indication

The battery capacity is shown by one of the following symbols on

the LCD:     

If the   symbol is displayed, the battery needs replacing as 
measurement accuracy can no longer be guaranteed (See section 
4.1 Battery Replacement). This will be followed by a 

bAtt

 display 

and the multimeter will power down after 5 seconds.

6

3.3 Description of Terminals

20A

Input terminal for AC & DC current measurements to 20A

μA mA

 

 

Input terminal for AC & DC current measurements to 400 mA

COM

Common terminal

nsHz% 

:

 

Input terminal for AC and DC voltage, resistance, 
conductance, continuity, diode test , frequency and duty cycle

K-TYPE

Input terminals for temperature probes

3.4 Description of Press Buttons

RANGE

Selects manual ranging

REL 

 

Selects relative function

MIN/MAX

Selects min/max function

HOLD

Selects display hold function

PEAK ± 

cal>2s

Selects peak hold measurement

 

Turns on/off the backlight

SHIFT

Selects secondary functions

HFR

Selects -3db point of high frequency rejection filter 

6000

Sets display to 6000 counts

3.5. Description of LCD Symbols 
 

7

HFR1

High frequency reject > 1 kHz selected

HFR 2

High frequency reject > 100 kHz selected

RANGE

Manual ranging is selected

MAX

Maximum indication is displayed

MIN

Minimum indication is displayed

HOLD

Display hold is activated

P+

Indicates peak + measurement

P-

Indicates peak - measurement

REL 

Relative function selected

Indicates >30V at input terminals

AC

Indicates AC measurement

DC

Indicates DC measurement

AC 

DC

Indicates AC + DC measurement

APO

Auto power off is activated

 

Indicates battery level

Diode testing function is selected

Continuity function is selected

mV, V, 

μA, mA, A, 

nF, μF, mF, 

:

, k

:

, M

:

nS,

Hz, kHz, MHz, 

%, 

°C, °F

Units of measurement being displayed

8

3.6 Auto Power Off

If the multimeter is inactive for a period of 30 minutes it will 
automatically power off.

If any button is pressed after the clamp meter has automatically 
powered off, the clamp meter will turn back on.

To disable the auto power off function hold the 

MIN/MAX

 button at 

the same time as turning the rotary switch from 

OFF

 to any position.

The 

APO

 symbol will no longer be displayed on the LCD.

3.7 Backlight

To switch on the backlight press the 

 button. Press again to turn 

the backlight off.

The backlight will automatically power off after approx. 3 minutes.

3.8 Auto/Manual Ranging

To select manual ranging, press the 

RANGE

 button. The 

RANGE

 

symbol will be displayed on the LCD.

To manually select a range when in manual mode press the 

RANGE

 

button until the required range is selected.

To exit manual ranging, hold down the 

RANGE

 button for >2 

seconds. The 

RANGE

 symbol will no longer be displayed.

3.9 Relative Function

The relative function is used to remove an offset or residual value 
from a measurement.

To remove and store an offset to memory, press the 

REL 

 

button. 

The LCD will display the 

REL 

 

symbol and the offset will be 

removed from all consequent readings until the relative mode is 
deactivated.

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Summary of Contents for MM94

Page 1: ...Measurements 15 3 24 Continuity Testing 15 3 25 Diode Testing 16 4 Maintenance 16 4 1 Battery Replacement 16 4 2 Fuse Replacement 17 4 3 Test Lead Replacement 17 4 4 Calibration 17 4 5 Cleaning 18 4 6 Repair Service 18 4 7 Storage Conditions 18 5 Warranty 19 Measurement Categories 20 Specifications 1 1 SAFETY INFORMATION Always read before proceeding REMEMBER SAFETY IS NO ACCIDENT These instructio...

Page 2: ...th CAT III and CAT II installations up to 1000V to earth and within the operating temperature and humidity range specified The CAT III 1000V marking does not mean the clamp meter can be used to 1000V AC rms but that it will be safe to the user if inadvertently connected across a voltage up to 1000V AC rms to earth If the removable probe tip caps are not fitted to the probes of the test leads their...

Page 3: ... of LCD Symbols 7 HFR1 High frequency reject 1 kHz selected HFR 2 High frequency reject 100 kHz selected RANGE Manual ranging is selected MAX Maximum indication is displayed MIN Minimum indication is displayed HOLD Display hold is activated P Indicates peak measurement P Indicates peak measurement REL Relative function selected Indicates 30V at input terminals AC Indicates AC measurement DC Indica...

Page 4: ...ions connect the test leads to the circuit being measured and read the measured ac voltage from the display 11 3 15 DC Voltage Measurements Connect the black test lead to the COM terminal and the red test lead to the terminal Set the rotary switch to the or position as required Taking all necessary safety precautions connect the test leads to the circuit being measured and read the measured dc vol...

Page 5: ... if d600 15 3 25 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 terminal Set the rotary switch to the position Press the SHIFT button twice The LCD will display the symbol Taking all necessary safety precautions connect the test leads to the diode being tested If the diode ...

Page 6: ...ered neglected contaminated or damaged by accident or abnormal conditions of operation handling or storage Martindale authorised resellers shall extend this warranty on new and unused products to end user customers only but have no authority to extend a greater or different warranty on behalf of Martindale Martindale s warranty obligation is limited at Martindale s option to refund of the purchase...

Page 7: ...range Crest factor 3 at full scale 6 at half scale Peak hold accuracy on AC current ranges 45Hz to 500 Hz 3 5 rdg 500 dts Peak hold response time 1ms Input protection 0 5 A 1000 V fast blow ceramic fuse on 600μA to 400mA ranges 20A 600V fast blow ceramic fuse on 20 A range Note 1 Apply currents 10 A for 30 seconds maximum then allow a 10 minute cooling period Specification MM94 TRMS Digital Multim...

Page 8: ...0 R H Altitude up to 2000m Pollution degree 2 indoor use SAFETY Conforms to BS EN 61010 1 BS EN 61010 2 033 CAT IV 600V CAT III 1000V Class II double insulation EMC Conforms to BS EN 61326 1 Specification MM94 TRMS Digital Multimeter SPECIFICATION FOR TL16 TEST LEADS Maximum voltage 1000V AC DC Maximum current 10A continuous Connector 4mm banana plug with fixed shroud Environmental Temperature Ope...

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