Benning MM 1-1, MM 1-2, MM 1-3 User guide
BENNING
MODEL: MM1-1 / MM1-2 / MM1-3
Service Information
The Service Information provides the following information:
● Precautions and safety information
● Specifications
● Basic maintenance (cleaning, replacing the battery and fuses)
● Performance test procedures
● Calibration and calibration adjustment procedures
TABLE OF CONTENTS Page
Introduction 1
Precautions and Safety Information 1
Symbols 1
Safety 2
Specifications 3
General Specification 3
Voltage Specification 4
Current Specifications 4
Resistance, Diode, Frequency Specifications 5
Continuity, Capacitance, Temperature Specification 5
Physical and environment characteristics 7
Certification and compliance 7
Required Equipment 8
Basic Maintenance 9
Opening the Meter Case 9
Replacing the Battery 9
Testing Fuses 10
Replacing Fuses 10
Cleaning 10
Performance Tests 11
Testing the Display 11
Testing the Voltage Function 12
Testing the Resistance Function 13
Testing the Capacitance Function 13
Testing the Diode 14
Testing the amp (A) Function 14
Testing Current Function 14/15
Testing the Frequency 15
Testing the Temperature Function 16
Calibration 17/18
Calibrating DCV, ACV, DCA Functions 17/18
i
Introduction
Warning
To avoid shock or injury, do not perform the verification tests or calibration procedures
described in the manual unless you are qualified to do so.
The information provided in this document is for the use of qualified personnel only.
Caution
The MM1-1, MM1-2, MM1-3 serials contain parts that can be damaged by static discharge.
Follow the standard practices for handling static sensitive devices.
For additional information about BENNING GMBH & CO. KG. and its products, and
services, visit BENNING GMBH & CO. KG. web site at:
www.benning.de
Precautions and Safety Information
Use the Meter only as described in the Users Manual. If you do not do so, the protection provided by
the Meter may be impaired. Read the “Safety Information” page before servicing this product.
In this manual, a Warning identifies conditions and actions that pose hazard (s) to the user; a
Caution identifies conditions and actions that may damage the Meter or the test instruments.
The Symbols
The symbols used on the Meter and in this manual are explained in Table A.
Table A. The Symbols
Symbol Meaning
Alternating signal
Direct signal
Refer to the manual, Important information.
Take appropriate precautions. Hazardous
voltage may be present.
Battery
Earth ground
Fuse
Double insulated
Conforms to EU directives
1
SAFETY
Review the following safety precautions to avoid injury and prevent damage to this product or
any products connected to it. To avoid potential hazards, use the product only as specified.
CAUTION: These statements identify conditions or practices that could result in damage to
the equipment or other property.
WARNING: These statements identify conditions or practices that could result in personal
injury or loss of life.
Specific precautions
Use proper Fuse. To avoid fire hazard, use only the fuse type and rating specified for this
product.
Do not operate without covers. To avoid personal injury, do not apply any voltage or current to
the product without covers in place.
Electric overload. Never apply a voltage to a connector on the product that is outside the range
specified for that connector.
Avoid electric shock. To avoid injury or loss of life, do not connect or disconnect probes or test
leads while they are connected to a voltage source.
Do not operate in wet/damp conditions. To avoid electric shock, do not operate this product in
wet or damp conditions.
2
SPECIFICATIONS
All specifications are warranted unless noted typical and apply to the MM1-1, MM1-2, MM1-3.
Stated accuracies are at 23°C±5°C at less than 80% relative humidity and without the battery
indicator displayed.
General specifications
Characteristics Description
Display count 3 1/2
Numeric update rate 1.5 times / sec
Polarity display Automatic
Overrange display “OL” is displayed
Low voltage indicator is indicated
Automatic power-off time Automatic backslit off = 10 minutes
Power source 1.5V×2 IEC LR03 or AAA size
Maximum input voltage 600V CAT Ⅲ between V and COM
Maximum floating voltage
Maximum input current 10A between A and COM
Maximum open circuit Voltage (current inputs) 600V between A and COM
Overload protection A connector 10A (500V) fast blow fuse
V connector 1100Vp V, V, , , , , Hz, µA, °C, °F
Temperature Coefficient 0.15×(Spec. Accuracy) / °C, <18°C or >28°C
Battery Life 220 hours typical (alkaline)
600V CAT Ⅲ between any terminal and earth
ground
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Measurement Characteristics
Accuracy is ±(% reading + number of digits) at 23°C ± 5°C, less than 80% R.H.
(1) DC Volts
Range Resolution Accuracy
Over voltage
protection
200mV 100µV
2V 1mV
20V 10mV
±(0.5% reading + 2 digits) DC 1000V
200V 100mV
1000V 1V
Input Impedance：10M (over 1000M in 600mV range).
(2) AC Volts
Range Resolution Accuracy Over voltage protection
200mV 0.1mV Unspecified
2V 1mV
20V 10mV
750V rms
±(1.5% reading + 5 digits)
200V 100mV
750V 1V
Input Impedance：10M // less than 100pF.
Frequency Response：50Hz～500Hz
AC Conversion Type：AC conversions are ac-coupled true rms responding, calibrated to the rms value
sine wave input.
(3) DC Current
Range Resolution Accuracy Voltage Burden
2A 1mA
±(1.0% reading + 2 digits) 2V max
10A 10mA
Overload Protection: A input：10A (500V)
(4) AC Current
Range Resolution Accuracy Voltage Burden
2A 1mA
±(1.5% reading + 5 digits)*
1
2V max
10A 10mA
Frequency Response：50Hz～500Hz
Overload Protection: A input：10A (500V)
1
*
AC Conversion Type：Conversions type and additional specification are same as AC Voltage.
4
(5) Resistance
Range Resolution Accuracy
200 0.1
Over voltage
protection
2K 1
20K 10
200K 100
2M 1K ±(1.0% reading + 3 digits)
20M* 10K ±(1.5% reading + 3 digits)
Open circuit Voltage：-1.3V approx.
* There is a little rolling less then ±2%
(6) Diode Check and Continuity
Range Resolution Accuracy
10mV ±(1.5% reading + 5 digits)* 1.5mA 2V
* For 0.4V ~ 0.8V
Overload Protection：600V rms max.
Continuity：Built-in buzzer sounds when measured resistance is less than 270 and sound off when
measured resistance is more than >850
Between 270 to 850 the buzzer maybe sound or off either.
(7) Frequency
Range Resolution
±(0.7% reading + 3 digits)
Max. Test
Current
Sensitivity
Accuracy Overload
600V rms
Max. Open
Circuit Voltage
protection
2000Hz 1Hz
20KHz 10Hz
200KHz 100Hz
2MHz 1KHz 250mV rms
20MHz 10KHz 1V rms
* Less than 20Hz the sensitivity is 1.5V rms.
** Max. Sensitivity: <5 Vac rms
100mV rms *
Frequency:
0.01% ± 2
digit
600V rms
5
(8) Capacitance
Range Resolution Accuracy
2nF 1pF
20nF 10pF
200nF 100pF
2µF 1nF
20µF 10nF
200µF 100nF
2mF* 1µF
Overload Protection ：600V rms.
* <100 dgt of reading rolling.
(9) Temperature °C (for MM1-3 only)
Function Range Overload protection
-20°C ～ 0°C ±(2% reading + 4 digits)
Over voltage
Protection
±(1.9% reading + 8 digits) 600V rms
1°C ～ 100°C ±(1% reading + 3 digits)
101°C ～ 500°C ±(2% reading + 3 digits)
501°C ～ 800°C ±(3% reading + 2 digits)
(10) Temperature °F (for MM1-3 only)
Function Range
-4°F ～ 32°F ±(2% reading + 8 digits)
33°F ～ 212°F ±(1% reading + 6 digits)
213°F ～ 932°F ±(2% reading + 6 digits)
933°F ～ 1472°F ±(3% reading + 4 digits)
(11) Auto Power Off (APO)
If the meter idles for more than 10 minutes, the meter automatically turns the power off. When this
happens, the state (non-logic measurement) of the meter is saved, the meter can be turned back on
by pressing any switch or changing the rotary switch. If the meter is Re-Powered by pressing a
switch, the LCD display the saved state, press the Hold switch to disable the hold state. The meter
will alarm 15 seconds before automatically turning power off, any key press or rotary change will
reset Auto-Power-Off.
(12) Disable Auto Power Off
Overload protection
600V rms
600V rms
In order to disable auto power off function, power up the meter whilst pressing down any switch
other than the “Hold“ switch.
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