Product information
Details
M74 is designed to perform Global Earth Resistance measurements, trip out time test on AC RCD type, Insulation and Continuity of earth conductors according to VDE and IEC common standards on typical urban electrical installations.
M74 to quickly perform an automatic sequence of the above tests directly to the plugs of electrical plants with OK or NOT OK response results.
M74 meter also include others features as phase sequence, leakage current, transducer and a powerful DMM function for TRMS measures of voltage and current ideal for troubleshooting operations both in civil and industrial environments. Voltage and current peak measure on 1ms it's also ok for inrush current evaluation of electrical motor devices.
M74 have a large LCD display for easy readings, a modern and ergonomic external case, a innovative electronic function selector for easy to use and a protection rubber holder to prevent accidental damaged.
Features:
DMM Function
- DC voltage
- DC/ AC TRMS Voltage
- Automatic detection of AC/DC signals
- AC TRMS Current with optional clamp
- AC TRMS Leakage current with optional clamp (HT96U）
- Resistance
- Continuity test with buzzer
- Frequency with test leads
- Frequency with optional clamp
- Phase sequence with 1 or 2 wires method
- Phase coincidence with 1 or 2 wires method
- MIN/MAX/AVG functions
- PEAK function with response time 1ms
- HOLD function
- Auto Power OFF
Safety Test
- Trip-out time of RCDs type AC Standard
- Continuity test of protective conductors with 200mA
- Insulation Resistance with 250, 500VDC
- Tripping time on RCDs type AC General with 30，30x5，100，300mA
- Global Earth Resistance without RCD tripping
- Global Earth Resistance with 0.1Ohm resolution
- AUTOTEST function: automatic test of Global Earth Resistance + RDC test + Insulation test
Features:
|
Features |
M74 |
|
Continuity test of protective conductors with 200mA |
√ |
|
Insulation Resistance with 250, 500VDC |
√ |
|
Tripping time on RCDs type AC General with 30，30x5，100，300mA |
√ |
|
Global Earth Resistance without RCD tripping |
√ |
|
AUTOTEST: (Global Earth Resistance, RCD tripping time + Insulation)through a single outlet of the installation |
√ |
|
Contact Voltage |
√ |
|
Phase coincidence with 1 or 2 wires method |
√ |
|
AC TRMS Leakage current with optional clamp (HT96U） |
√ |
|
DC/ AC TRMS Voltage measurement |
√ |
|
AC TRMS Current measurement |
√ |
|
Resistance and Continuity test with buzzer |
√ |
|
HOLD MIN/MAX/AVG functions |
√ |
|
Voltage and current peak values with response time of 1ms |
√ |
|
Large visible and innovation electronic selector |
√ |
Technical Specifications:
VERIFY TESTS SECTION
Continuity test on protective and equalizing conductors
|
Range（Ω） |
Resolution（Ω） |
Accuracy |
Overload protection |
|
0.01 ~ 19.99 |
0.01 |
±（5.0% rdg + 3dgt） |
605Vrms max |
|
20.0 ~ 99.90 |
0.1 |
Test Current: >200mA DC for R≤4Ω（included calibration）
Resolution on current measurement:：1mA
Open-circuit voltage: 4V≤Vo≤24V
Insulation Resistance
|
Range（MΩ） |
Resolution（MΩ） |
Accuracy |
Overload protection |
|
0.00 ~ 19.99 |
0.01 |
±（5.0% rdg + 2dgt） |
605Vrms max |
|
20.0 ~ 199.9 |
0.1 |
||
|
200 ~ 999 |
1 |
±（10.0% rdg + 2dgt） |
Test Voltage: 500V DC
Test Voltage accuracy: -0％~10％rdg
Short circuit current: <3.0mA
Nominal test current: 1mA@1kΩ x Vnom；1mA@500kΩ
RCD Tipping time
|
Range（ms） |
Resolution（ms） |
Accuracy |
Overload protection |
|
2 ~ 400 |
1 |
±（2.0% rdg + 2dgt） |
605Vrms max |
Nominal test current: 30mA，30x5mA，100mA，300mA
RCD type: AC, Standard
Phase-Earth voltage: 110V－265V
Frequency 50Hz±0.5Hz / 60Hz±0.5Hz
Limit contact voltage: 50V
Global Earth Resistance without RDC’s tripping
|
test current |
Range（Ω） |
Resolution（Ω） |
Accuracy |
Overload protection |
|
15mA |
1 ~ 1999 |
1 |
±（5.0% rdg + 2dgt） |
605Vrms max |
|
100mA |
0.1 ~ 199.9 |
0.1 |
±（5.0% rdg + 3dgt） |
Phase-Earth voltage: 110V－265V
Frequency: 50Hz±0.5Hz / 60Hz±0.5Hz
Limit contact voltage: 50V
MULTIMETER SECTION
DC VOLTAGE(Autorange)
|
Range |
Resolution |
Accuracy |
Input impedance |
Overload protection |
|
1.0mV ~ 999.9mV |
0.1mV |
±（0.5% rdg + 2dgt） |
1MΩ |
605Vrms max |
|
1.000V ~ 9.999V |
1mV |
|||
|
10.00V ~ 99.99V |
10mV |
|||
|
100.0V ~ 605.0V |
100mV |
AC VOLTAGE TRMS（Autorange）
|
Range |
Resolution |
Accuracy （30－70Hz） |
Accuracy （70－400Hz） |
Input impedance |
Crest factor |
|
1.0mV ~ 999.9mV |
0.1mV |
±（1.0% rdg + 2dgt） |
±（2.0% rdg + 2dgt） |
1MΩ |
3 |
|
1.000V ~ 9.999V |
1mV |
1.5 |
|||
|
10.00V ~ 99.99V |
10mV |
||||
|
100.0V ~ 605.0V |
100mV |
AC/DC VOLTAGE:MAX/MIN/AVG/PEAK
|
Function |
Range |
Resolution |
Accuracy |
Response time |
|
MAX,MIN,AVG |
1.0mV ~ 999.9mV |
0.1mV |
±（5.0% rdg + 10dgt） |
500ms |
|
1.000V ~ 9.999V |
1mV |
|||
|
10.00V ~ 99.99V |
10mV |
|||
|
100.0V ~ 605.0V |
100mV |
|||
|
PEAK |
1.0mV ~ 999.9mV |
0.1mV |
1ms |
|
|
1.000V ~ 9.999V |
1mV |
|||
|
10.00V ~ 99.99V |
10mV |
|||
|
100.0V ~ 605.0V |
100mV |
DC/AC CURRENT TRMS(with external clamp)
|
Range |
Resolution |
DC Accuracy |
Accuracy （30－70Hz） |
Accuracy （70－400Hz） |
Crest factor |
Overload protection |
|
1.0mV~999.9mV |
0.1mV |
±（0.5% rdg + 2dgt） |
±（1.0% rdg + 2dgt） |
±（2.0% rdg + 2dgt） |
3 |
605Vmax |
|
1.000V ~ 1.200V |
1mV |
1.5 |
Note: accuracy indicated don’t consider clamp accuracy. Please refer also to transducers clamp user’s manual.
AC/DC CURRENT:MAX/MIN/AVG/PEAK(with external clamp)
|
Function |
Range |
Resolution |
Accuracy |
Response time |
Overload protection |
|
MAX,MIN,AVG |
1.0mV~ 999.9mV |
0.1mV |
±（5.0% rdg + 10dgt） |
500ms |
605Vrms max |
|
1.000V ~ 1.200V |
1mV |
||||
|
PEAK |
10mV ~ 999.9mV |
0.1mV |
1ms |
||
|
1.000V ~ 3.000V |
1mV |
RESISTANCE AND CONTINUITY TEST
|
Range |
Resolution |
Accuracy |
Continuity test |
Overload protection |
|
0.00Ω ~ 39.99Ω |
0.01Ω |
±（1.0% rdg + 5dgt） |
R≤40Ω |
605Vrms max for 1 minute |
|
40.0Ω ~ 399.9Ω |
0.1Ω |
|||
|
400Ω ~ 3999Ω |
1Ω |
|||
|
4.00kΩ ~ 39.99kΩ |
10Ω |
FREQUENCY(with test leads)
|
Range |
Resolution |
Accuracy |
Input voltage |
Overload protection |
|
30.0 ~ 199.9Hz |
0.1Hz |
±（0.5% rdg + 2dgt） |
1.0mV－605V |
605Vrms max |
|
200 ~ 400Hz |
1Hz |
FREQUENCY(with external clamp)
|
Range |
Resolution |
Accuracy |
Input voltage |
Overload protection |
|
30.0 ~ 199.9Hz |
0.1Hz |
±（0.5% rdg + 2dgt） |
1.0mV ~ 1.000V |
605Vrms max |
|
200 ~ 400Hz |
1Hz |
PHASE SEQUENCE/CONFORMITY(1 wire measurement)
|
Type of measure |
Voltage range（V） |
Frequency range |
System type |
|
SEQUENCY |
90 ~ 315 （Phase－Earth） |
45 ~ 65 Hz |
Up to 315（Phase－Earth）; Up to 550V（Phase－Phase） |
|
CONFORMITY |
PHASE SEQUENCE/CONFORMITY(2 wire measurement)
|
Type of measure |
Voltage range（V） |
Frequency range |
System type |
|
SEQUENCY |
110 ~ 315 （Phase－Neutral） |
45 ~ 65 Hz |
Up to 315（Phase－Earth） Up to 550V（Phase－Phase） |
|
CONFORMITY |
Max crest factor :1.5
NOTE: the two-wire measurement can be performed also phase to phase in plants without neutral, even with one phase to earth, but always with phase to phase voltage up to 550V
General Specifications:
DISPLAY:
Features: Dual numeric,9999 points
Display update: 2 times/sec
Visible area: 73 x 73mm
POWER SUPPLY:
Batteries: 4batteries 1.5V type LR6－AA－AM3－MN 1500
ELECTRICAL FEATURES:
Conversion: AC 16 Bit，TRMS
Sample frequency: 64 sample/period
MECHANICAL FEATURES:
Dimensions: 240(W) x 100(L) x 45(D)mm
Weight (included batteries) about 630g
WORKING ENVIRONMENTAL STANDATDS:
Reference temperature: (23°C ± 5°C)
Working temperature: 0°C ~ 40°C
Allowed relative humidity: < 70% RH
Storage temperature: -10°C ~ 60°C
Storage humidity: < 70% RH
TEST VERIFIES REFERENCE STANDARDS
Continuity test with 200mA: IEC61557－4
Insulation resistance: IEC61557－2
Earth resistance: IEC61557－5
RCD test: IEC61557－6
GENERAL REFERENCE STANDARDS
Safety of measuring instruments: EN61010－1＋A2（1997）
Product type standard: IEC61557－2，3，4，5，6
Insulation: class 2(double insulation)
Pollution degree: 2
Overvoltage category: CAT III 550V AC Phase－Ground
CAT III 550V AC Phase－Phase
Use: internal use; max altitude: 2000m
EMC: EN61326－1（1998）＋A1（1999）
This instrument complies with the European for CE marking
Standard Accessories:
- C2075: two safety banana + Shuko plug cable
- KIT0075: kit of 2 Test leads + 2 alligator clips·
- BORSA75: Carrying bag
- Calibration Certificate ISO9000
- Instruction manual
- Warranty card
Optional accessories:
- HT4003: 400A AC clamps
- HT96U: leakage current clamp 1-100-1000A/1V 54mm max diameter
- NOCANBA: adaptor for connection HT96U clamp
Standards:
- CE mark
- EN 61557-4 Continuity test
- EN 61557-2 Insulation Resistance
- EN 61557-5 Earth resistance
- EN 61557-6 RCD test
- EN 61326 EMC Standards
- EN 61010-1
- 16th edition
- EN61008
- EN61009
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