Difference between revisions of "Voltcraft ME-42"

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{{Infobox multimeter
{{Infobox multimeter
| image          = <!-- [[File:Voltcraft_vc820_device.png|180px]] -->
| image          = [[File:Voltcraft ME-42 logo.png|180px]]  
| name            = Voltcraft ME-42
| name            = Voltcraft ME-42
| status          = in progress
| status          = supported
| source_code_dir = serial-dmm
| source_code_dir = serial-dmm
| counts          = 4000
| counts          = 4000
Line 12: Line 12:
}}
}}


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.
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 ==
== Hardware ==
Line 23: Line 25:
* '''Fuses''': 800mA/250V 5x20mm and 15A/250V 6x30mm (superfast, ceramic fuses)
* '''Fuses''': 800mA/250V 5x20mm and 15A/250V 6x30mm (superfast, ceramic fuses)
* '''Battery''': 9V NEDA 1604 or 6F22
* '''Battery''': 9V NEDA 1604 or 6F22
** One [http://mysite.verizon.net/tomhunter/experime/meter.htm source] reported a very low battery life.


'''RS232 cable:'''
'''RS232 cable:'''


Standard RS-232 cable with DB9 (M) plug.
* Standard RS-232 cable with DB9 (M) plug.
 
* During tests run by [[User:Matthias Heidbrink|Matthias]], this device did not work with several [[Serial port#USB to serial converter chipsets|USB to serial converters]] (tested MosChip, Prolific, FTDI chipsets), only on a real "RS-232" port.
During tests run by [[User:Matthias Heidbrink|Matthias]], this device did not work with several [[Serial Port#USB_to_Serial_converter_chipsets|USB to serial converters]] (tested MosChip, Prolific, FTDI chipsets), only on a real "RS-232" port.
 
One source on the net [http://mysite.verizon.net/tomhunter/experime/meter.htm] reported a very low battery life.


== Photos ==
== Photos ==
Line 36: Line 36:
'''Multimeter''':
'''Multimeter''':


<!--
<gallery>
<gallery>
File:Voltcraft_vc820_device.jpg|<small>Device, front</small>
File:Voltcraft ME-42 1.jpg|<small>Front</small>
File:Voltcraft vc820 device back1.jpg|<small>Device, back</small>
File:Voltcraft ME-42 2.jpg|<small>Back</small>
File:Voltcraft vc820 device back2.jpg|<small>Device, back w/o battery</small>
File:Voltcraft ME-42 3.jpg|<small>Inside, with shielding</small>
File:Voltcraft vc820 battery1.jpg|<small>Battery 1</small>
File:Voltcraft ME-42 4.jpg|<small>Back of board, without shielding</small>
File:Voltcraft vc820 battery2.jpg|<small>Battery 2</small>
File:Voltcraft ME-42 5.jpg|<small>Board and power button removed</small>
File:Voltcraft vc820 device open1.jpg|<small>Device, open</small>
File:Voltcraft ME-42 6.jpg|<small>RS-232 interface and cover</small>
File:Voltcraft vc820 device open2.jpg|<small>Device, open 2</small>
File:Voltcraft vc820 device open3.jpg|<small>Cover 1</small>
File:Voltcraft vc820 device open4.jpg|<small>Cover 2</small>
File:Voltcraft vc820 shielding.jpg|<small>Shielding</small>
File:Voltcraft vc820 ir part.jpg|<small>IR assembly</small>
File:Voltcraft vc820 ir pcb top.jpg|<small>IR PCB, top</small>
File:Voltcraft vc820 ir pcb bottom.jpg|<small>IR PCB, bottom</small>
File:Voltcraft vc820 pcb front with lcd.jpg|<small>PCB, front</small>
File:Voltcraft vc820 pcb back.jpg|<small>PCB, back</small>
File:Voltcraft vc820 pcb front top.jpg|<small>PCB, top</small>
File:Voltcraft vc820 pcb light1.jpg|<small>PCB, light 1</small>
File:Voltcraft vc820 pcb light2.jpg|<small>PCB, light 2</small>
File:Voltcraft vc820 fs9721 lp3.jpg|<small>FS9721_LP3</small>
File:Voltcraft vc820 crystal.jpg|<small>Crystal</small>
File:Voltcraft vc820 lcd front.jpg|<small>LCD, front</small>
File:Voltcraft vc820 lcd back.jpg|<small>LCD, back</small>
File:Voltcraft vc820 lcd.jpg|<small>LCD, all segments</small>
</gallery>
</gallery>
-->


== Protocol ==
== Protocol ==
Line 102: Line 82:


|-
|-
| Metex ME-21
| [[Metex ME-21]]
| style="text-align:center" | -
| style="text-align:center" | -
| style="text-align:center" | ?
| style="text-align:center" | ?
Line 111: Line 91:
| style="text-align:center" | ●
| style="text-align:center" | ●
| style="text-align:center" | -
| style="text-align:center" | -
| style="text-align:center" | ?
| style="text-align:center" | -
| Manual Range
| Manual Range


Line 272: Line 252:
| 400.0 mA
| 400.0 mA
| 100 µA
| 100 µA
| ±(1,2% + 3)
| ±(1.2% + 3)
| "
| "
|  
|  
Line 279: Line 259:
| 20.00 A
| 20.00 A
| 10 mA
| 10 mA
| ±(2,0% + 5)
| ±(2.0% + 5)
| "
| "
|  
|  
Line 287: Line 267:
| 4.000 mA
| 4.000 mA
| 10 µA
| 10 µA
| ±(1,0% + 5)
| ±(1.0% + 5)
| mq Curr., unit A, mqflags AC
| mq Curr., unit A, mqflags AC
|   
|   


|-
|-
| 300.0 mA
| 400.0 mA
| 100 µA
| 100 µA
| ±(1,5% + 5)
| ±(1.5% + 5)
| "
| "
|  
|  
Line 354: Line 334:
|  
|  
| mq V, unit V, mqflags DC,DIODE
| mq V, unit V, mqflags DC,DIODE
| Max. 1,5 mA
| Max. 1.5 mA


|-
|-
Line 369: Line 349:
The column "sigrok result" contains in short form what the driver generates for the resp. data type.
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 changing to a new range automatically or manually, the device might send the old value scaled to the new range for a short time. This behaviour is caused by the device, not by sigrok!
The device seems to be extremely slow when the RS-232 interface is enabled 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 changing to a new range automatically or manually, the device might send the old value scaled to the new range for a short time. This behaviour is caused by the device, not by sigrok! It improves slightly in manual range.


[[Category:Device]]
[[Category:Device]]
[[Category:Multimeter]]
[[Category:Multimeter]]
[[Category:In progress]]
[[Category:Supported]]

Latest revision as of 13:14, 27 May 2020

Voltcraft ME-42
Voltcraft ME-42 logo.png
Status supported
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
    • One source reported a very low battery life.

RS232 cable:

  • Standard RS-232 cable with DB9 (M) plug.
  • During tests run by Matthias, this device did not work with several USB to serial converters (tested MosChip, Prolific, FTDI chipsets), only on a real "RS-232" port.

Photos

Multimeter:

  • Front

  • Back

  • Inside, with shielding

  • Back of board, without shielding

  • Board and power button removed

  • RS-232 interface and cover

Protocol

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

Model family

It seems that this device belongs to a family of several similiar devices and OEM models.

Metex Conrad PeakTech Radio Shack RMS Frequency Transistor Logic Temp Cap. Remarks
Metex ME-11 - ? RadioShack 22-805 ? ? ? ? ? ? Amps manual range; seems to be similiar to ME-42


Metex ME-21 - ? ? - ● - ● - - Manual Range
Metex ME-22 Voltcraft ME-22 ? ? ? ● ● ● ● ? Manual Range
Metex ME-22 RMS Voltcraft ME-22 RMS ? ? ● ● ● ● ● ? Manual Range
Metex ME-31 - PeakTech 3410 ? ? ? ● ? ● ?
Metex ME-32 Voltcraft ME-32 ? ? - - ● - ● ● Amps manual range
Metex ME-42 Voltcraft ME-42 ? ? - - - - - - Amps manual range

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
400.0 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 seems to be extremely slow when the RS-232 interface is enabled 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 changing to a new range automatically or manually, the device might send the old value scaled to the new range for a short time. This behaviour is caused by the device, not by sigrok! It improves slightly in manual range.

Retrieved from "https://sigrok.org/w/index.php?title=Voltcraft_ME-42&oldid=15063"