Voltcraft ME-42

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Voltcraft ME-42
Status in progress
Source code serial-dmm
Counts 4000
IEC 61010-1 CAT II (750 V AC/1000 V DC)
Connectivity RS-232 (DB9)
Measurements voltage, current, resistance, diode, continuity
Features autorange, hold, bargraph
Website conrad.de

The Voltcraft ME-42 is a 4000 counts, CAT II (750/1000V) handheld digital multimeter with RS232 connectivity. It is an OEM version of the Metex ME-42. The device was sold by Conrad Elektronik as article 120130 starting from 1999 and is not available any more.

Hardware

Multimeter:

  • TODO
  • Fuses: 800mA/250V 5x20mm and 15A/250V 6x30mm (superfast, ceramic fuses)
  • Battery: 9V NEDA 1604 or 6F22

RS232 cable:

Standard RS-232 cable with DB9 (M) plug.

During tests run by Matthias, this device also did not work with several USB to serial converters (tested MosChip, Prolific, FTDI chipsets), only on a real "RS-232" port.

Photos

Multimeter:


Protocol

See Multimeter_ICs#Metex_14-byte_ASCII for the DMM IC protocol.

It seems that the device does not work with some RS232-USB converters.

Model family

It seems that several versions and OEM models exist.

Metex Conrad PeakTech Radio Shack RMS Frequency Transistor Remarks
Metex ME-11 - ? RadioShack 22-805 ? ? ?


Metex ME-21 - ? ? ? ? ?
Metex ME-22 Voltcraft ME-22 ? ? ? ?
Metex ME-31 - PeakTech 3410 ? ? ? ?
Metex ME-32 Voltcraft ME-32 ? ? ? ? ?
Metex ME-42 Voltcraft ME-42 ? ? - - -


Resources

Measurement functions and ranges

Measurement function Range Resolution Accuracy sigrok result Remarks
V= 400.0 mV 100 μV ±(0.5% + 3) mq V, unit V, mqflags DC "
4.000 V 1 mV "
40.00 V 10 mV "
400.0 V 100 mV "
1000 V 1 V "
V≈ 400.0 mV 100 μV ±(1.0% + 5) mq V, unit V, mqflags AC 40 Hz - 100 Hz
4.000 V 1 mV " 40 Hz - 400 Hz
40.00 V 10 mV " "
400.0 V 100 mV " "
750 V 1 V " "
A= 4.000 mA 1 µA ±(0.8% + 3) mq Curr., unit A, mqflags DC
400.0 mA 100 µA ±(1,2% + 3) "
20.00 A 10 mA ±(2,0% + 5) "
A≈ 4.000 mA 10 µA ±(1,0% + 5) mq Curr., unit A, mqflags AC
300.0 mA 100 µA ±(1,5% + 5) "
20.00 A 10 mA ±(3.0% + 5) "
Ω 400.0 Ω 100 mΩ mq Res., unit Ω, mqflags - Continuity beep < 50 Ω
4.000 kΩ 1 Ω "
40.00 kΩ 10 Ω "
400.0 kΩ 100 Ω "
4.000 MΩ 1 kΩ "
40.00 MΩ 10 kΩ "
Diode 2.000 V– 1 mV mq V, unit V, mqflags DC,DIODE Max. 1,5 mA
Data Hold -

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

The device is extremely slow and often takes up to about 10 seconds to detect a changed value or switch to another range. During this time a previous value keeps being sent. When operating the Range Hold button, the device might send the old value scaled to the new range for a few times. This behaviour is caused by the device, not by sigrok!