Gossen Metrawatt

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Gossen Metrawatt is a German manufacturer of professional and high-end test and measurement equipment, including multimeters.

This article tries to give an overview of the multimeters with interfaces for data exchange, OEM models and communication.

Company

Multimeters

One remark concerning device names: The manufacturer writes the name of the device series sometimes "METRAHit", sometimes METRAHIT or even METRA HIT, sometimes not even consistently for the same device. For simplicity it will be "Metrahit" here most of the time, other names alike.

Metrahit 1x series

Gossen Metrawatt Siemens OEM Rishabh Count Remarks
Metrahit 12S Rish multi 12S 3100
Metrahit 13S Rish multi 13S 3100
Metrahit 14A B1102 7KB1102-8AA ?
Metrahit 14S B1103 7KB1103-8AA Rishmulti 14S 3100
Metrahit 15S Rishmulti 15S 3100
Metrahit 16I 3100 Insulation tester 500/1000 V
Metrahit 16S B1104 7KB1104-8AA Rishmulti 16S 3100
Metrahit 16T 3100 Insulation tester 100 V telecom
Metrahit 17 B1107 7KB1107-8AA ? 3100? Milliohm meter (IR interface???)
Metrahit 18S B1108 7KB1108-8AA Rishmulti 18S 31000

The Metrahit 1x series supports sending data via IR/RS232.

The devices are not available from Gossen Metrawatt any more, but it seems that a company named Rishab in India 1 sells them as OEM.

Metrahit 2x Series

Gossen Metrawatt Siemens OEM LEM ELMES/HEME/NORMA OEM Dranetz brand Count Remarks
Metrahit 24S
Metrahit 25S B1102 7KB1102-8BA
Metrahit 26C Multimeter + calibrator
Metrahit 26S
Metrahit 27EX Milliohm meter for explosive atmospheres
Metrahit (27) H+E with insulation tester; seems to be a METRAHit 27I in different colors
Metrahit 27I B1107 B 7KB1107-8BA ? DranTech PMIT Milliohm and Megaohm, insulation tester
Metrahit 27M Milliohm
Metrahit 28S B1105 7KB1105-8AA Unigor 280
Metrahit 29S B1106 7KB1106-8AA Unigor 290 PowerLogger 10 Energy measurement functions
Metrahit 30M DranTech ULTRA 1200000 Laboratory multimeter

The Metrahit 2x series supports bidirectional data exchange via IR.

Metrahit Starline Series

The series of newer devices with only three sockets (only one socket for all current measurement ranges) is called Starline Series. The manufacturer sub-divides this further into an A Series, E Series and S Series, which does not make a big difference concerning communicating with the devices.

Gossen Metrawatt Siemens OEM Dranetz brand Count Remarks
Metrahit X-Tra (M240A) Siemens B1125 7KB1125-8AA Drantech XTRA 12000 Teardown on EEVblog: 1
Metrahit Outdoor (M240o) DranTech Outdoor 12000 IP65; seems to be a more rugged, different-coloured flavour of the X-Tra
Seculife Hit (M687A) 12000 Seems to be a white, "medical" version of the X-Tra
Metrahit EBase (M251A) 60000
Metrahit ESpecial (M252A) 60000
Metrahit ETech (M253A) 60000 Simular to Extra, but fewer functions.
Metrahit Extra (M250A) 60000
Metrahit Energy (M249A) 60000 Energy and power analysis functions; EEVblog: Teardown: 1 Battery measurement: 2
Metrahit Ultra (M248A) 310000 Precision Multimeter
Metrahit Ultra BT (M248B) 310000 Precision Multimeter with additional Bluetooth interface
Metrahit Iso (M246B) DranTech ISO 30000 Multimeter with insulation measurement 50/100/250/500/1000 V, 3,1 GΩ
Metrahit Iso Aero (M246M) 30000 Multimeter with insulation measurement 10/50/100/250/500/1000 V, 3,1 GΩ
Metrahit T-Com (M246A) 3100 Multimeter with special functions for symmetrical copper wiring, insulation measurement 100V
Metrahit T-Com Plus (M246S) 3100 Like T-Com, some more functions.
Metracal MC (M245A) 60000 Multimeter and calibrator; older versions named Metrahit Multical.

Metraport Series

Gossen Metrawatt Count Remarks
Metraport 40S (M234D) 30000 Foldable multimeter; USB interface, resettable fuse

Communication Hardware

Most Gossen Metrawatt multimeters having data communication support communicate unidirectionally or bi-directionally through the case using IR and proprietary communication adaptors. The advantage of this construction is that it allows a closed case without unnecessary holes (one model, the Metrahit Outdoor, even has IP65 protection!), the disadvantage is a need for special, expensive adaptors to convert this to common RS232 or USB. Please note that the IR is just serial data (?), not IrDA.

The Metrahit Ultra BT also supports Bluetooth.

Metrahit 1x/2x series

Metrahit RS232

IR→RS232 adaptor for unidirectional communication from the multimeter to the computer.

Works with Metrahit 1x and with Metrahit 2x devices in Send Mode.

RS232 parameters: 8192 Baud, 8N1, DTR ON, RTS ON.

The communication speed of 8192 Baud is not supported by some operating systems and common RS232-USB adaptors.

Not available any more.

Metrahit SI232

IR→RS232 adaptor for unidirectional communication from the multimeter to the computer and data storage.

Works with Metrahit 1x and with Metrahit 2x devices in Send Mode.

Up to six SI232 can be cascaded to communicate to the computer via a single RS232 interface. Up to 10 'SI232 can be cascaded to measure offline synchronously.

128 kByte battery-buffered CMOS memory, up to about 100000 data sets.

Multimeter: 8192 Baud, 950 nm, 8N1.
RS232: 9600/19200/38400 Baud, 8N1.

Not available from Gossen Metrawatt any more. It seems that Rishab in India 1 still sells it as OEM product Rish SI232.

Metrahit BD232

IR↔RS232 adaptor allowing bidirectional communication between multimeter and computer.

Works with Metrahit 2x devices, including 30M.

Up to six BD232 can be cascaded to communicate to the computer via a single RS232 interface. When only Metrahit 2x multimeters are used, BD232 and SI232 adaptors can be mixed.

9600/19200/38400 Baud.

Metrahit SI232 II

IR↔RS232 adaptor allowing bidirectional communication between multimeter and computer and data storage.

Works with Metrahit 1x and Metrahit 2x devices.

128 kByte battery-buffered CMOS memory, up to about 100000 data sets.

Multimeter: 8192/9600 Baud, 950 nm, 8N1.
RS232: 9600/19200/38400 Baud, 8N1.

4-8 SI232 II (depending on multimeter types and baud rate) can be cascaded to communicate to the computer via a single RS232 interface. Up to 10 'SI232 II can be cascaded to measure offline synchronously.

Not available any more.

USB Hit

IR↔USB adaptor for Metrahit.

For Metrahit 2x/30M devices only.

Metrahit Starline Series

USB X-Tra

IR↔USB adaptor for the Starline Series devices.

Bluetooth

Bluetooth 2.1 + EDR, Class 2

For the Metrahit Ultra BT.

Communication Protocols

Metrahit 1x/2x Send Mode

Proprietary binary protocol. Used for sending data to PC.

Metrahit 1x/2x Block Send Mode

Proprietary binary protocol. Used for polling buffered data from PC.

Metrahit 2x Other modes

There seem to be 2 or 3 other communication modes for the Metrahit 2x series. See description available from manufacturer.

Starline Series

Newer Metrahit devices use a proprietary communication protocol that is very close to SCPI.

LabView

Gossen Metrawatt offers LabView drivers for the Metrahit Energy, the Metrahit Ultra and the Metraport 40S.