Gossen Metrawatt Metrahit 25S
| Status | in progress |
|---|---|
| Source code | gmc_mh_1x_2x |
| Counts | 31000 |
| IEC 61010-1 | CAT III 1000 V, CAT IV 600 V |
| Connectivity | Infrared (RS232) |
| Measurements | voltage, current, resistance, capacitance, temperature, diode, continuity |
| Features | autorange, data hold |
| Website | [1] |
The Gossen Metrawatt Metrahit 25S is a 4.5 digit, 31000 counts 1000V CAT III/600 V CAT IV handheld digital multimeter with IR (RS232) connectivity.
Hardware
- Power supply:
- Battery: 2x 1,5 V IEC R 6, IEC LR 6 or corresponding NiCd rechargeable batteries
- Fuse:
- Current 300 mA: FF (UR) 1,6 A/1000 V AC/DC (10 kA) 6,3 mm x 32 mm
- Current 3A/10A: FF (UR) 10 A/1000 V AC/DC (30 kA) 10 mm x 38 mm
Photos
Using the device with sigrok
The device is supported in Send Mode using a RS232 interface by the driver gmc-mh-1x-2x-rs232. Set the multimeter to use the communication adaptor RS232.
The multimeter is also supported in bidirectional mode using a BD232 or SI232-II interface by the driver gmc-mh-2x-bd232. Set the multimeter to use the communication adaptor BD232.
The device might be not detected by the driver if it is in a mode where it sends data rarely, either with a huge send interval or with a measurement function that delivers a very low data rate, e.g. temperature measurements with K type sensor. Then it should be set to a mode with higher data rate during the initialisation of the driver.
Measurement functions and ranges
| Measurement function | Range | Resolution | Accuracy | sigrok result | Remarks |
|---|---|---|---|---|---|
| V= | 300 mV | 10 μV | ±(0,02% + 0,010% + 5) | mq V, unit V, mqflags DC | |
| 3 V | 100 μV | ±(0,02% + 0,005% + 5) | " | ||
| 30 V | 1 mV | " | |||
| 300 V | 10 mV | " | |||
| 1000 V | 100 mV | " | |||
| V≈ | 300 mV | 100 µV | ±(0,5% + 30) (> 500 Digit)) | mq V, unit V, mqflags AC,RMS | |
| 3 V | 100 μV | ±(0,2% + 30) | " | ||
| 30 V | 1 mV | " | |||
| 300 V | 10 mV | " | |||
| 1000 V | 100 mV | " | |||
| V db≈ | -48 - 63 dB | 0,01 dB | ± 0,1 dB | mq V, unit V, mqflags AC,RMS | Actually the 5 AC ranges, see there for accuracy. |
| V db≈ rel | -48 - 63 dB | 0,01 dB | ± 0,1 dB | mq V, unit V, mqflags AC,RMS | Actually the 5 AC ranges, see there for accuracy. To activate, press yellow button in dB mode, then do second measurement. Cannot be distinguished from non-rel measurement remotely. |
| A= | 300.00 µA | 10 nA | 0,05% + 0,02% + 5 | mq Curr., unit A, mqflags DC | |
| 3.0000 mA | 100 nA | 0,05% + 0,01% + 5 | " | ||
| 30.000 mA | 1 mA | 0,05% + 0,01% + 5 | " | ||
| 300.00 mA | 10 µA | 0,1% + 0,01% + 5 | " | ||
| 3.0000 A | 100 µA | 0,2% + 0,05% + 5 | " | ||
| 10.000 A | 1 mA | 0,2% + 0,05% + 5 | " | ||
| A≃ | 300.00 µA | 10 nA | 0,5% + 30 | mq Curr., unit A, mqflags AC,DC,RMS | |
| 3.0000 mA | 100 nA | " | |||
| 30.000 mA | 1 µA | " | |||
| 300.00 mA | 10 µA | " | |||
| 3.0000 A | 100 µA | 0,7% + 30 | " | ||
| 10.000 A | 1 mA | 0,5% + 30 | " | ||
| Ω | 300.00 Ω | 1 mΩ | 0,05% + 0.01% + 5 | mq Res., unit Ω, mqflags - | |
| 3.0000 kΩ | 10 mΩ | " | |||
| 30.000 kΩ | 100 mΩ | " | |||
| 300.00 kΩ | 1 Ω | " | |||
| 3.0000 MΩ | 10 Ω | 0,1% + 0.02% + 5 | " | ||
| 30.000 MΩ | 100 Ω | 1% + 0.2% + 5 | " | ||
| Ohm/Cont. | 300 Ω | 100 mΩ | 1% + 3% | mq Res., unit Ω, mqflags - | |
| Diode/Cont. | 300 mV | 100 µV | 0.2% + 3 | mq V, unit V, mqflags DC,DIODE | |
| Diode | 3 V | 100 µV | 0.2% + 3 | mq V, unit V, mqflags DC,DIODE | |
| Cap. F | 3.000 nF | 1 pF | 1.0% + 0.2 | mq Cap., unit F, mqflags - | |
| 30.00 nF | 10 pF | " | |||
| 300.0 nF | 100 pF | " | |||
| 3.000 µF | 1 nF | " | |||
| 30.00 µF | 10 nF | " | |||
| 300.0 µF | 100 nF | ±(5.0% + 6) | " | ||
| 3.000 mF | 1 µF | " | |||
| 30.00 mF | 1 µF | " | |||
| Hz≈, ≃ | 300.00 Hz | 0.001 Hz | ±(0.05% + 1) | mq Freq., unit Hz, mqflags AC,DC | To activate in AC, press yellow button twice. |
| 3.0000 kHz | 0.01 Hz | " | |||
| 300.000 kHz | 1 Hz | " | |||
| °C | Pt100/Pt1000 –200.0 - +100.0 °C |
0.1 °C | ±(0,5 K + 3) | mq Temp., unit °C, mqflags - | |
| Pt100/Pt1000 +100.0 - 850.0 °C |
±(0,2% + 3) | mq Temp., unit °C, mqflags - | |||
| K NiCr-Ni -270-+1372,0 °C | ±(0,7% + 3) | " | |||
| J Fe-CuNi -210 - +1200.0 °C | ±(0,8% + 3) | " | Not tested yet due to lack of corresponding sensor. | ||
| °F | " | " | " | mq Temp., unit °F, mqflags - | Details and ranges like °C.
|
| Event count | mq V, unit V, mqflags AC,RMS,REL | Counts events >= 2500 digits that last >=2s with a break >=2s. To activate, switch to voltage ACDC, press yellow button twice. Press up to 4 times to cycle parameters, press long to stop. See manual. Not useful remotely because the current measurement value is sent, not the counter. | |||
| Stop Watch | 100 ns | (Time data) | Max. 100 Min. To activate, select a 3V-1000V≃ range manually, press yellow button, press AUTO for start/stop, DATA for reset. Using the stop watch delivers only voltage data and sometimes seems to bring the device into a mode where it even sends invalid data packets. | ||
| Data Hold | mqflags += HOLD | Disabled while IR interface is active on Matthias' test device. | |||
| MIN | mqflags += MIN | Influences only display, via IR flag is set, but actual current value is delivered. | |||
| MAX | mqflags += MAX | Influences only display, via IR flag is set, but actual current value is delivered. |
The Accuracy row was simplified, see manual for exact specs. If the value contains three values, the middle value is % or range.
The column "sigrok result" contains in short form what the driver generates for the resp. data type.