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The GMC Instruments METRAHIT IM TECH BT (M272S) is an all-in-one device with 30,000 digits reading: Milliohm- and Multimeter with Data Logger. The M272S is good for service and diagnostics for electric machines and systems, in electric machinery manufacturing and in aviation technology as well as for test and measurement in laboratories and test fields.
Refer to the Data Sheet for specification details
Internal Clock
| Time format | DD.MM.YYYY hh:mm:ss |
| Resolution | 0.1 s (measured values timestamp) |
| Accuracy | ±1 minute per month |
| Temperature influence | 50 ppm/K |
Reference Conditions
| Ambient temperature | +23 °C ±2 K |
| Relative humidity | 40% ... 75% |
| Meas. quantity frequency | 45 Hz ... 65 Hz |
| Meas. quantity waveform | Sinusoidal |
| Supply voltage | 4.0 V ±0.1 V |
Influencing Quantities and Influence Error
| Influencing Quantity | Sphere of Influence | Measured Quantity / Measuring Range 1 | Influence Error (...% rdg. + ... d) / 10 K |
Temperature |
0 °C ... +21 °C and +25 °C ... +40 °C | V | 0.2 + 5 |
| V | 0.4 + 5 | ||
| 300 Ω ... 3 MΩ | 0.5 + 5 | ||
| 30 MΩ | 1 + 5 | ||
| mA/A | 0.5 + 5 | ||
| mA/A | 0.8 + 5 | ||
| 30 nF ... 300 µF | 2 + 5 | ||
| Hz | 0.2 + 5 | ||
| °C/°F (Pt100/Pt1000) | 0.5 + 5 |
1 With zero balancing
Frequency Influence for VAC VAC+DC Voltage Ranges
| Deviation 1 | ||
| Frequency Range | 300 mV range ± (... % rdg. + ... d) | 3 V, 30 V, 300 V range 2 ± (... % rdg. + ... d) | 1000 V range 2 ± (... % rdg.) |
| 15 Hz ... 45 Hz | 2 + 30 | 2 + 30 | 2 + 30 |
| > 65 Hz ... 1 kHz | 0.5 + 30 | 0.5 + 30 | 1 + 30 |
| > 1 kHz ... 10 kHz | 2 + 30 | 1.5 + 30 | 10 + 30 |
| > 10 kHz ... 20 kHz | 3 + 30 | 1.5 + 30 | — |
| > 20 kHz ... 50 kHz | 3 + 30 | 5 + 30 | — |
| > 50 kHz ... 100 kHz | 10 + 30 | 10 + 30 | — |
1 For sinusoidal input signals > 10% to 100% of the range (mV range: as of 30% of range, at 1% to 10% of the range: f < 50 kHz, intrinsic error increased by 0.2% of the upper range limit.
2 Overload capacity of the voltage measurement input:
power limiting: frequency x voltage max. 6 x 106 V x Hz at > 100 V
Frequency Influence for IAC / IAC+DC Current Measuring Ranges
| Influence Error 1 | |
| Frequency Range | 300 mA to 300 mA ± (... % rdg. + ... digits) | 1 A range ± (... % rdg. + ... digits) |
| 15 Hz ... 45 Hz | 2 + 30 | 2 + 30 |
| > 65 Hz ... 1 kHz | 1 + 30 | 1 + 30 |
| > 1 kHz ... 2 kHz | 1 + 30 | 1 + 30 |
| > 2 kHz ... 5kHz | 1 + 30 | 3 + 30 |
| > 5 kHz ... 10 kHz | 5 + 30 | 5 + 30 |
1 For sinusoidal input signals > 10% to 100% of the range.
| Influencing Quantity | Sphere of Influence | Measured Quantity / Measuring Range | Influence Error 1 |
Crest Factor CF | 1 … 3 | V ∼, A ∼ | ± 1% rdg. |
| > 3 ... 5 | ± 3% rdg. |
1 Except for sinusoidal waveform
| Influencing Quantity | Sphere of Influence | Measured Quantity | Influence Error |
| Relative Atmospheric Humidity | 75% 3 days instrument off | V, A, Ω, F, Hz, °C | 1 x intrinsic uncertainty |
| Battery Voltage |
| ditto | included in intrinsic uncertainty |
| Influencing Quantity | Sphere of Influence | Measured Qty. / Measuring Range | Damping |
Common Mode Interference Voltage | Interference quantity max. 1000 V ∼ | V | > 90 dB |
Interference quantity max. 1000 V ∼ 50 Hz ... 60 Hz, sinusoidal | 3 V ∼ | > 90 dB | |
| 30, 300 V ∼ | > 150 dB | ||
| 1000 V ∼ | > 150 dB | ||
Series Mode Interference Voltage | Interference quantity: V ∼, respective nominal value of the measuring range, max. 1000 V ∼ , 50 Hz ... 60 Hz sinusoidal | V | > 50 dB |
| Interference quantity max. 1000 V – | V ∼ | > 50 dB |
Response Time (after manual range selection)
| Measured Quantity / Measuring Range | Digital Display Response Time | Measured Quantity Jump Function |
| V , V ∼ A , A ∼ | 1.5 s | from 0 to 80% of upper range limit value |
| 300 Ω ... 3 MΩ | 2 s |
from ∞ to 50% of upper range limit value |
| 30 MΩ, MΩ@UISO | Max. 5 s | |
| Continuity | < 50 ms | |
| °C (Pt 100) | Max. 3 s | |
| 1.5 s | |
| 30 nF ... 300 µF | Max. 5 s | from 0 to 50% of upper range limit value |
| >10 Hz | 1.5 s |
Display
TFT color graphic display (55 x 36 mm) with analog and digital display including unit of measure, type of current and various special functions
| Background Illumination Activated background illumination can be regulated by means of a light sensor. | |
Analog Bar Graph | |
| Scaling | Linear |
| Polarity display | With automatic switching |
| Sampling rate | 40 measurements per second and display refresh |
Digital Measured Value Display | |
| Resolution / character height | 320 x 480 dots, 12 mm |
Number of places | 31000 / 3100 4¾-place in the V, A, Hz and Ω, measuring functions depending on parameter setting |
| Overflow display | "OL" is displayed for ≥ 31,000 digits or ≥ 3100 digits |
| Polarity display | "–" (minus sign) is displayed if plus pole is connected to "⊥" |
| Sampling rate | 10 and 40 measurements per second with the Min-Max function except for the capacitance, frequency and duty cycle measuring functions |
| Refresh rate | 2 times per second, every 500 ms |
Electrical Safety
| Protection category | II per EN 6 010-1 |
| Measuring category | CAT III CAT IV |
| Nominal voltage | 1000 V 600 V |
| Pollution degree | 2 |
| Test voltage | 7.4 kV~ per EN 61 010-1 |
Fuses
Current measuring ranges & 4-Wire mΩ measuring ranges | F1: FF 1 A/1000 V AC/DC, 6.3 x 32 mm Fuse with breaking capacity of 30 kA at 1000 V AC/DC, protects the current measurement input in the 300 µA to 1 A ranges |
| 2-Wire mΩ measuring ranges | F2: FF 0.315 A / 1000 V 6.3 x 32 mm |
Power Supply
| Battery pack | 3.7 V, 4000 mAh, LiPo (approx. 25% self-discharging per year) |
| Operating time | approx. 20 hours (without MΩISO measurement / RLo / R 4-wire measurement) |
| Battery indicator | Battery capacity display via battery symbol:  , querying of momentary charge level via menu function |
| Power OFF function | The multimeter is switched off automatically: – when battery voltage drops to below approx. 3.6 V – if none of the keys or the rotary switch are activated for an adjustable duration of 10 to 59 min. and the multimeter is not in the continuous operating mode |
| Rechargeable battery packs can only be recharged externally. | |
Electromagnetic Compatibility (EMC)
Interference emission EN 61326-1:2013 class B
Interference immunity EN 61326-1:2013
Short-term measuralueed v deviation of up to 10% may occur during electromagnetic interference thus reducing the specified operating quality.
Ambient Conditions
| Accuracy range | 0 °C ... +40 °C |
| Operating temperature (storage temp. with batt.) | -10 °C ... +50 °C -20 °C ... +50 °C with rubber holster |
| Storage temperature | -25 °C ... +70 °C (without battery) |
| Relative humidity | 40 ... 75%, no condensation allowed |
| Elevation | to 2000 m |
| Place of use | Indoors, except within specified ambient conditions |
Data Interface
| Type | Bluetooth 4.2 |
| Frequency band Transmitting power | 2.402 ... 2.480 GHz, Max. 91 mW |
| Functions | – Query measuring functions and parameters – Query momentary measurement data |
Internal Measured Value Storage
Memory capacity 64 MBit for approx. 300,000 measured values with indication of date and time
Mechanical Design
| Housing | Impact resistant plastic (ABS) |
| Dimensions | 235 x 105 x 56 mm (without rubber holster) |
| Weight | approx. 0.7 kg with battery pack |
| Protection | Housing: IP 52 (pressure equalization via the housing) |
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