Gossen Metrawatt Metrahit 27I

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Gossen Metrawatt 27I
Status planned
Counts 31000
IEC 61010-1 CAT II 600 V
Connectivity Infrared (RS232/USB)
Measurements voltage, resistance, temperature, diode, continuity
Features autorange, data hold, backlight, insulation measurement, data logging
Website [1]

Please note: This page is a work in progress and still partly incorrect.

The Gossen Metrawatt Metrahit 27I is a 3100/31000 counts 600 V CAT II handheld digital multimeter with bidirectional IR (RS232/USB) connectivity. It supports milliohm and insulation (megaohm) measurements and has data logging capabilities.

There are two versions of this device, an older one with yellow rotary switch and a newer one with red rotary switch. They also have different power supply connectors.

Hardware

  • Power supply:
    • Battery: 3x 1,2 V NiMH rechargeable batteries
    • External power supply NA HIT 27 (Art. Z218J) by Gossen Metrawatt, 5V, 600 mA (newer version)
  • Fuse:
    • FF (UR) 1,6 A/1000 V AC/DC (10 kA) 6,3 mm x 32 mm

Photos

Communication Protocol

The complete description is available on request from the manufacturer.


Measurement functions and ranges

Measurement function Range Resolution Accuracy sigrok result Remarks
V= 3 V 100 μV ±(0.1% + 10) mq V, unit V, mqflags DC
30 V 1 mV ±(0.1% + 5) "
300 V 10 mV "
600 V 100 mV "
V≈ 3 V 100 μV ±(0.2% + 10) mq V, unit V, mqflags AC
30 V 1 mV "
300 V 10 mV "
600 V 100 mV "
mΩ@1A 3 mΩ 0.001 mΩ ±(1% + 10) mq Res., unit Ω, mqflags - 4-wire Kelvin measurement
30 mΩ 0.001 mΩ ±(0.5% + 10) " "
300 mΩ 0.01 mΩ " "
mΩ@200 mA 30 mΩ 0.01 mΩ ±(0.25% + 10) " "
300 mΩ 0.01 mΩ " "
3 Ω 0.1 mΩ " "
30 Ω 1 mΩ " "
Ω 300.00 Ω 1 mΩ ±(0.1% + 10) " ZERO with yellow button
3.0000 kΩ 10 mΩ ±(0.1% + 5) " "
30.000 kΩ 100 mΩ "
300.00 kΩ 1 Ω "
3.0000 MΩ 10 Ω "
30.000 MΩ 100 Ω ±(1.5% + 10) "
MΩ (Insulation) 30 MΩ 10 kΩ ±(2% + 10) " Insulation measurement, test voltage selectable 50/100/250/500 V
300 MΩ 100 kΩ " "
3 GΩ 1 MΩ ±(3% + 10) " "
Cont. 310 Ω 100 mΩ ±(1% + 5) mq Res., unit Ω, mqflags - Signal < about 10 Ω
Diode 3 V 100 µV ±(1% + 5) mq V, unit V, mqflags DC,DIODE
Hz 300.00 Hz 0.01 Hz ±(0.05% + 5) mq Freq., unit Hz, mqflags AC
3.000 kHz 0.1 Hz "
°C Pt100/Pt1000
–200.0 - +100.0 °C
0.1 °C ±(1 K + 5) mq Temp., unit °C, mqflags -
Pt100/Pt1000
+100.0 - 850.0 °C
±(0.5K + 5) "
Ni 100/Ni1000
-60-+180 °C
" Not tested yet due to lack of corresponding sensor.
°F " " " mq Temp., unit °F, mqflags - Details and ranges like °C.
Data Hold mqflags += HOLD
MIN mqflags += MIN
MAX mqflags += MAX

The Accuracy row was simplified, see manual for exact specs.

The column "sigrok result" contains in short form what the driver generates for the resp. data type.

This device has an uncommon input impendance of 2.1 MΩ in AC/DC voltage measurement modes.