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GMC Instruments’ METRAHIT ULTRA M248A ± 310,000 Digits Precision TRMS Multimeter is designed for an array of temperature measuring and data logging applications. The METRAHIT ULTRA M248A is outfitted with features and functions formulated for maximum efficiency like the automatic/manual measuring range selection, RMS values with distorted waveform, overload protection, storage of min-max values and much more.
| Internal Clock | |
| Time format | DD.MM.YYYY hh:mm:ss,0 |
| Resolution | 0.1 sec. |
| Accuracy | ±1 minute per month |
| Temperature Influence | 50 ppm/K |
| Reference Conditions | |
| Ambient temperature | +23 °C ±2 K |
| Relative humidity | 40 to 75% (no condensation allowed) |
| Meas. quantity frequency | Range: 45 ... 65 Hz |
| Meas. quantity waveform | Sinusoidal |
| Battery voltage | range: 1.8 ... 3.2 V |
| Data Interface – Infrared | |
| Type | Optical via infrared light through the housing |
| Data transmission | Serial, bidirectional (not IrDa compatible) |
| Protocol | Device specific |
| Baud rate | 38,400 baud |
| Functions | – Select/query measuring functions and parameters – Query momentary measurement data – Read out stored measurement data |
| The USB X-TRA plug-in interface adapter (see accessories) is used for adaptation to the PC’s USB port. | |
| Internal Measured Value Storage | |
| Memory capacity | 16 MBit for approx. 300,000 measured values with indication of date and time |
| Power Supply | |
| Battery | 2 ea. 1.5 V mignon cell (2 ea. size AA) Alkaline manganese per IEC LR6 (2 ea. 1.2 V NiMH rechargeable battery also possible) |
| Service life | With alkaline manganese: approx. 200 hrs. |
| Battery indicator | Battery capacity display with battery symbol in 4 segments: Querying of momentary battery voltage via menu function. |
| Power OFF function | The multimeter is switched off automatically: – If battery voltage drops to below approx. 1.8 V – If none of the keys or the rotary switch are activated for an adjustable duration (10 to 59 min.) and the multimeter is not in the continuous operation mode |
| Power pack socket | If the NA X-TRA power pack has been plugged into the instrument, the installed batteries are disconnected automatically. Rechargeable batteries can only be recharged externally. |
| Display Transreflective LCD panel (65 mm x 36 mm) with display of up to 3 measured values, unit of measure, type of current and various special functions. | |
| Background illumination Background illumination is switched off approximately 1 minute after it has been activated. | |
| Digital | |
| Display / char. height | 7-segment characters Main display: 13 mm Auxiliary display: 7.5 mm |
| Number of places | 309,999 steps |
| Overflow display | “OL” is displayed for ≥ 310,000 digits |
| Polarity display | “–” (minus sign) is displayed if plus pole is connected to “⊥” |
| Measuring rate | 10 or 40 measurements per second with the Min-Max function except for the capacitance and frequency measuring functions |
| Refresh Rate | 2 times per second, every 500 ms |
| Acoustic Signals | |
| For voltage | Above 600 V in the 600 V range: intermittent (250 ms on, 250 ms off) |
| For current | – Above 10 A: intermittent signal – Above 16 A: continuous signal – For displayed temperature > 50 °C |
| Fuse | |
| Fuse link | FF (UR) 10 A/1000 V AC/DC, 10 x 38 mm, Switching capacity: 30 kA at 1000 V AC/DC, protects the current measurement input in the 300 μA through 10 A ranges |
| Electrical Safety per IEC 61010-1:2010/VDE 0411-1:2011 | |
| Protection class | II |
| Measuring category | CAT III CAT IV |
| Operating voltage | 600 V 300 V |
| Pollution degree | 2 |
| Test Voltage | 5.2 kV~ |
| Electromagnetic Compatibility (EMC) | |
| Interference emission | EN 610326-1:2006 class B |
| Interference immunity | EN 610326-1:2006 EN 610326-2-1:2006 |
| Ambient Conditions | |
| Accuracy range | 0 °C to +40 °C |
| Operating temperature range TA | –100 °C to +50 °C * |
| Storage temp. range | –25 °C to +70 °C (without batteries) |
| Relative humidity | 40 to 75%, no condensation allowed |
| Elevation | To 2000 m |
| Deployment | Indoors, except within specified ambient conditions |
| * Exception: current > 10 A to 16 A, operation at up to 40 °C | |
| Mechanical Design | |
| Housing | Impact resistant plastic (ABS) |
| Dimensions | 200 x 87 x 45 mm (without rubber holster) |
| Weight | Approx. 0.4 kg with batteries |
| Protection | Housing: IP 52 (pressure equalization by means of the housing) Sockets: IP 20 |
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