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          = planned
| status          = supported
| source_code_dir = serial-dmm
| source_code_dir = serial-dmm
| counts          = 4000
| counts          = 4000
Line 12: Line 12:
}}
}}


'''Please note: This page is a work in progress, more to come.'''
The '''Voltcraft ME-42''' is a 4000 counts, CAT II (750/1000V) handheld digital multimeter with RS232 connectivity.


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.
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 25: 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:'''


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.


== Photos ==
== Photos ==
Line 34: 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 ==


<!-- See [[Multimeter_ICs#Fortune_Semiconductor_FS9721_LP3]].
See [[Multimeter_ICs#Metex_14-byte_ASCII]] for the DMM IC protocol.
 
-->
The multimeter uses a variant of the common 14-char protocol. The protocol is described (incompletely) in the manual.


== Model family ==
== Model family ==


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


{| border="0" style="font-size: smaller" class="alternategrey sortable sigroktable"
{| border="0" style="font-size: smaller" class="alternategrey sortable sigroktable"
Line 83: Line 62:
!Frequency
!Frequency
!Transistor
!Transistor
!Logic
!Temp
!Cap.
!Remarks
!Remarks


Line 93: Line 75:
| style="text-align:center" | ?
| style="text-align:center" | ?
| style="text-align:center" | ?
| style="text-align:center" | ?
|  
| style="text-align:center" | ?
| style="text-align:center" | ?
| style="text-align:center" | ?
| Amps manual range; seems to be similiar to ME-42




|-
|-
| Metex ME-21
| [[Metex ME-21]]
| style="text-align:center" | -
| style="text-align:center" | -
| style="text-align:center" | ?
| style="text-align:center" | ?
| style="text-align:center" | ?
| 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
|-
| Metex ME-22
| Voltcraft ME-22
| style="text-align:center" | ?
| style="text-align:center" | ?
| style="text-align:center" | ?
| style="text-align:center" | ?
| style="text-align:center" | ?
| style="text-align:center" | ?
| 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


|-
|-
| Metex ME-22
| Metex ME-22 RMS
| Voltcraft ME-22
| Voltcraft ME-22 RMS
| style="text-align:center" | ?
| style="text-align:center" | ?
| style="text-align:center" | ?
| style="text-align:center" | ?
| style="text-align:center" | ●
| style="text-align:center" | ●
| style="text-align:center" | ●
| 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
|


|-
|-
Line 123: Line 127:
| style="text-align:center" | ?
| style="text-align:center" | ?
| style="text-align:center" | ?
| style="text-align:center" | ?
| style="text-align:center" | ●
| style="text-align:center" | ?
| style="text-align:center" | ●
| style="text-align:center" | ?
| style="text-align:center" | ?
|  
|  
Line 131: Line 138:
| style="text-align:center" | ?
| style="text-align:center" | ?
| style="text-align:center" | ?
| style="text-align:center" | ?
| style="text-align:center" | ?
| style="text-align:center" | -
| style="text-align:center" | ?
| style="text-align:center" | -
| style="text-align:center" | ?
| style="text-align:center" | ●
|  
| style="text-align:center" | -
| style="text-align:center" | ●
| style="text-align:center" | ●
| Amps manual range


|-
|-
Line 144: Line 154:
| style="text-align:center" | -
| style="text-align:center" | -
| style="text-align:center" | -
| style="text-align:center" | -
|  
| style="text-align:center" | -
| style="text-align:center" | -
| style="text-align:center" | -
| Amps manual range


|}
|}


== Resources ==
== Resources ==
Line 153: Line 165:
* [http://www.produktinfo.conrad.com/datenblaetter/100000-124999/120130-an-01-de-Digitalmultimeter_ME_42.pdf Manual DE, single pages]
* [http://www.produktinfo.conrad.com/datenblaetter/100000-124999/120130-an-01-de-Digitalmultimeter_ME_42.pdf Manual DE, single pages]
* [http://www.produktinfo.conrad.com/datenblaetter/100000-124999/120130-an-01-ml-Digitalmultimeter_ME_42_de_en_fr_nl.pdf Manual DE/GB/F/NL]
* [http://www.produktinfo.conrad.com/datenblaetter/100000-124999/120130-an-01-ml-Digitalmultimeter_ME_42_de_en_fr_nl.pdf Manual DE/GB/F/NL]
== Measurement functions and ranges ==
{|border="0" style="font-size: smaller" class="alternategrey sortable sigroktable"
|-
! Measurement function
! Range
! Resolution
! Accuracy
! sigrok result
! Remarks
|-
| rowspan="5" | V=
| 400.0 mV
| 100 μV
| rowspan="5" | ±(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
| "
|
|-
| rowspan="5" | V≈
| 400.0 mV
| 100 μV
| rowspan="5" | ±(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
| "
| "
|-
| rowspan="3" | 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)
| "
|
|-
| rowspan="3" | 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)
| "
|
|-
| rowspan="6" | 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.


[[Category:Device]]
[[Category:Device]]
[[Category:Multimeter]]
[[Category:Multimeter]]
[[Category:Planned]]
[[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.

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