Difference between revisions of "Voltcraft ME-42"
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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 | 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. | One source on the net [http://mysite.verizon.net/tomhunter/experime/meter.htm] reported a very low battery life. | ||
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See [[Multimeter_ICs#Metex_14-byte_ASCII]] for the DMM IC protocol. | See [[Multimeter_ICs#Metex_14-byte_ASCII]] for the DMM IC protocol. | ||
== Model family == | == Model family == | ||
It seems that several | 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" | ||
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!Logic | !Logic | ||
!Temp | !Temp | ||
!Cap. | |||
!Remarks | !Remarks | ||
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| style="text-align:center" | ? | | style="text-align:center" | ? | ||
| [[RadioShack 22-805]] | | [[RadioShack 22-805]] | ||
| style="text-align:center" | ? | |||
| style="text-align:center" | ? | | style="text-align:center" | ? | ||
| style="text-align:center" | ? | | style="text-align:center" | ? | ||
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| style="text-align:center" | ● | | style="text-align:center" | ● | ||
| style="text-align:center" | - | | style="text-align:center" | - | ||
| style="text-align:center" | ? | |||
| Manual Range | | Manual Range | ||
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| style="text-align:center" | ● | | style="text-align:center" | ● | ||
| style="text-align:center" | ● | | style="text-align:center" | ● | ||
| style="text-align:center" | ? | |||
| Manual Range | | Manual Range | ||
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| style="text-align:center" | ● | | style="text-align:center" | ● | ||
| style="text-align:center" | ● | | style="text-align:center" | ● | ||
| style="text-align:center" | ? | |||
| Manual Range | | Manual Range | ||
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| style="text-align:center" | ? | | style="text-align:center" | ? | ||
| style="text-align:center" | ● | | style="text-align:center" | ● | ||
| style="text-align:center" | ? | |||
| | | | ||
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| 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" | | | style="text-align:center" | ● | ||
| style="text-align:center" | ● | |||
| Amps manual range | | Amps manual range | ||
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| 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" | - | ||
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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 | 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! | ||
[[Category:Device]] | [[Category:Device]] | ||
[[Category:Multimeter]] | [[Category:Multimeter]] | ||
[[Category:In progress]] | [[Category:In progress]] | ||
Revision as of 18:35, 24 March 2014
| 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 did not work with several USB to serial converters (tested MosChip, Prolific, FTDI chipsets), only on a real "RS-232" port.
One source on the net [1] reported a very low battery life.
Photos
Multimeter:
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 | |
| 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 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!