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MM94 

HIGH PEFORMANCE 

TRMS MULTIMETER

I

NSTRUCTION

M

ANUAL

 

 

 

ALWAYS READ THESE INSTRUCTIONS BEFORE PROCEEDING

Thank you for buying one of our products. For safety and a full 

understanding of its benefits please read this manual before use. 

Technical support is available from 01923 441717 and  

[email protected]

CONTENTS

1  

Safety Information   

1

1.1 

Meaning of Symbols and Markings 

1

1.2 Precautions 

2

2 Introduction 

5

2.1 Inspection 

5

2.2 Description 

5

2.3  

Accessories 

 

3 Operation 

6

3.1 General 

6

3.2 

Low Battery Indication 

6

3.3 

Description of Terminals 

7

3.4 

Description of Press Buttons 

7

3.5 

Description of LCD Symbols 

7

3.6 Auto 

Power 

Off 

9

3.7 Backlight 

9

3.8 Auto/Manual 

Ranging 

9

3.9 Relative 

Function 

9

3.10 Min/Max 

10

3.11 Display 

Hold 

10

3.12 High 

Frequency 

Rejection 

11

3.13 

Use of the TL16 Test Leads 

11

3.14 AC 

Voltage 

Measurements 

11

3.15 

DC Voltage Measurements 

12

3.16 AC+DC 

Voltage 

Measurements 

12

3.17 Current 

Measurements 

12

3.18 Peak 

Hold 

Measurement 

13

3.19 Resistance 

Measurements 

13

3.20 Conductance 

Measurements 

13

3.21 Capacitance 

Measurements 

14

3.22 

Frequency and Duty Cycle Measurements 

14

3.23 Temperature 

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 instructions contain both information and warnings that are 

necessary for the safe operation and maintenance of this product. It 

is recommended that you read the instructions carefully and ensure 

that the contents are fully understood. Failure to understand and 

to comply with the warnings and instructions can result in serious 

injury, damage or even death.

Particular attention should be paid to the Warnings, Precautions and 

Technical Specifications.

Please keep these instructions for future reference. Updated 

instructions and product information are available at: www.

martindale-electric.co.uk

1.1 Meaning of Symbols and Markings 

 

Caution - risk of danger & refer to instructions

 

Caution - risk of electric shock

 

 Equipment protected by double or reinforced 

insulation  

(Class II)

CAT II  

 (Measurement Category II) 

is applicable to test and 

measuring equipment connected directly to utilization 

points (socket outlets and similar points) of the low-

voltage MAINS installation.

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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