Difference between revisions of "Voltcraft VC-840"

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[[File:Voltcraft vc840 device front.jpg|thumb|right|Voltcraft VC-840]]
{{Infobox multimeter
| image          = [[File:Voltcraft_vc840_device_front.png|180px]]
| name            = Voltcraft VC-840
| status          = supported
| source_code_dir = serial-dmm
| counts          = 4000
| categories      = CAT IV (600V)
| connectivity    = [[Device_cables#UNI-T_UT-D02|RS232]] / [[Device_cables#UNI-T_UT-D04|USB]]
| measurements    = voltage, capacitance, continuity, diode, frequency, temperature, current, duty cycle
| features        = autorange, true-rms, hold, relative
| website        = [http://www.conrad.de/ce/de/product/123295/VOLTCRAFT-VC840-DMM/SHOP_AREA_17622&promotionareaSearchDetail=005 conrad.de]
}}


The [http://www.conrad.de/ce/de/product/123295/VOLTCRAFT-VC840-DMM/SHOP_AREA_17622&promotionareaSearchDetail=005 Voltcraft VC-840] is a 4000 counts, CAT IV (600V) handheld digital multimeter with RS232 or USB connectivity.
The '''Voltcraft VC-840''' is a 4000 counts, CAT IV (600V) handheld digital multimeter with RS232 or USB connectivity.
 
See [[Voltcraft VC-840/Info]] for more details (such as '''lsusb -vvv''' output) about the device.


== Hardware ==
== Hardware ==
Line 9: Line 18:
'''Multimeter''':
'''Multimeter''':
* '''Multimeter IC''': [http://www.ic-fortune.com/eng/new_product3_3.asp Fortune Semiconductor FS9721_LP3] ([http://www.ic-fortune.com/upload/Download/FS9721_LP3-DS-20_EN.pdf datasheet])
* '''Multimeter IC''': [http://www.ic-fortune.com/eng/new_product3_3.asp Fortune Semiconductor FS9721_LP3] ([http://www.ic-fortune.com/upload/Download/FS9721_LP3-DS-20_EN.pdf datasheet])
* ...
* '''Low power, True RMS-to-DC converter''': [http://www.analog.com/en/special-linear-functions/rms-to-dc-converters/ad737/products/product.html Analog Devices AD737J] ([http://www.analog.com/static/imported-files/data_sheets/AD737.pdf datasheet])
* '''Unknown SO-8 chip''': ?
* '''Crystal''': likely 4MHz (not verified, though)
* '''Fuses''': 10A/250V and 500mA/250V (one glass fuse, one HRV fuse)


'''[http://www.conrad.de/ce/de/product/125640/VOLTCRAFT-RS-232-SCHNITTSTELLENADAPTER/SHOP_AREA_17626&promotionareaSearchDetail=005 RS232 cable]''':
'''RS232 cable:'''
* TODO
* See [[Device cables#UNI-T_UT-D02]].


'''[http://www.conrad.de/ce/de/product/120317/Voltcraft-USB-SCHNITTSTELLENADPTER/SHOP_AREA_17626&promotionareaSearchDetail=005 USB cable]''':
'''USB cable:'''
* TODO
* See [[Device cables#UNI-T_UT-D04]].


== Photos ==
== Photos ==
Line 22: Line 34:


<gallery>
<gallery>
File:Voltcraft vc840 device front.jpg
File:Voltcraft vc840 device front.jpg|<small>Device, front</small>
File:Voltcraft vc840 device back1.jpg
File:Voltcraft vc840 device back1.jpg|<small>Device, back</small>
File:Voltcraft vc840 device back2.jpg
File:Voltcraft vc840 device back2.jpg|<small>Device, back w/o battery</small>
File:Voltcraft vc840 battery1.jpg
File:Voltcraft vc840 battery1.jpg|<small>Battery 1</small>
File:Voltcraft vc840 battery2.jpg
File:Voltcraft vc840 battery2.jpg|<small>Battery 2</small>
File:Voltcraft vc840 pcb back.jpg
File:Voltcraft vc840 pcb front.jpg|<small>PCB, front</small>
File:Voltcraft vc840 pcb front.jpg
File:Voltcraft vc840 pcb back.jpg|<small>PCB, back</small>
File:Voltcraft vc840 ad737j.jpg
File:Voltcraft vc840 ad737j.jpg|<small>Analog Devices AD737J</small>
File:Voltcraft vc840 fs9721 lp3.jpg
File:Voltcraft vc840 fs9721 lp3.jpg|<small>Fortune Semi. FS9721_LP3</small>
</gallery>
</gallery>


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


<gallery>
See [[Device cables#UNI-T_UT-D02]].
File:Voltcraft dmm rs232 cable.jpg|<small>Cable</small>
File:Voltcraft dmm rs232 cable ir.jpg|<small>Cable, IR</small>
File:Voltcraft dmm rs232 cable open.jpg|<small>Cable, open</small>
File:Voltcraft dmm rs232 cable pcb front.jpg|<small>PCB, front</small>
File:Voltcraft dmm rs232 cable pcb back.jpg|<small>PCB, back</small>
</gallery>


'''USB cable''':
'''USB cable:'''


TODO.
See [[Device cables#UNI-T_UT-D04]].


== Protocol ==
== Protocol ==


The connection to the PC is done using a cable which converts the optical signal (IR) on the multimeter to RS232.
See [[Multimeter_ICs#Fortune_Semiconductor_FS9721_LP3]] for the DMM IC protocol.


The serial connection uses '''2400 baud''' (hardcoded, cannot be changed) with 8n1 settings. The multimeter transmits 14-byte data packets periodically, the host can '''not''' send any commands whatsoever, only read the transmitted data.
Depending on the cable, additional decoding is needed, though.


A [http://www.produktinfo.conrad.com/datenblaetter/100000-124999/123295-da-01-en-RS232_Protocol_VOLTCRAFT_VC840_DMM.pdf short protocol description is available from Voltcraft/Conrad].
TODO: Serial cable vs. the two USB HID based cables.


TODO: Optional USB cable.
A [http://www.produktinfo.conrad.com/datenblaetter/100000-124999/123295-da-01-en-RS232_Protocol_VOLTCRAFT_VC840_DMM.pdf short protocol description is also available from Voltcraft/Conrad]. And [http://www2.produktinfo.conrad.com/datenblaetter/100000-124999/121112-da-01-en-Digitalmultimeter_VC840_Schnittstellenp.pdf another one].


== Resources ==
== Resources ==


TODO.
* [http://www.produktinfo.conrad.com/datenblaetter/100000-124999/123295-an-01-ml-VOLTCRAFT_VC840_DMM_de_en_fr_nl.pdf Manual]
* [http://www.produktinfo.conrad.com/datenblaetter/100000-124999/123295-up-01-en-Win7_32_64_Bit_VC840_DMM.zip Vendor software]
* [http://www.gecius.de/linux/vc840/ gecius.de: Multimeter VC840]
* [http://cw.kolleegium.ch/vc840/ kolleegium.ch: VC 840 Recorder]
* [http://www.true-random.com/driver-for-the-cheap-digital-multimeter-vc-840vc-820.html true random: driver for the cheap digital multimeter VC 840/VC 820]
* [http://true-random.com/homepage/projects/vc840/index.html true random: Software for the multimeters vc840/vc820]
* [http://www.lrr.in.tum.de/~acher/vc840/index.html Georg Acher: Voltcraft VC820/VC840 und Linux]
 
[[Category:Device]]
[[Category:Multimeter]]
[[Category:Supported]]

Latest revision as of 02:28, 1 May 2013

Voltcraft VC-840
Voltcraft vc840 device front.png
Status supported
Source code serial-dmm
Counts 4000
IEC 61010-1 CAT IV (600V)
Connectivity RS232 / USB
Measurements voltage, capacitance, continuity, diode, frequency, temperature, current, duty cycle
Features autorange, true-rms, hold, relative
Website conrad.de

The Voltcraft VC-840 is a 4000 counts, CAT IV (600V) handheld digital multimeter with RS232 or USB connectivity.

Hardware

Multimeter:

RS232 cable:

USB cable:

Photos

Multimeter:

  • Device, front

  • Device, back

  • Device, back w/o battery

  • Battery 1

  • Battery 2

  • PCB, front

  • PCB, back

  • Analog Devices AD737J

  • Fortune Semi. FS9721_LP3

RS232 cable:

See Device cables#UNI-T_UT-D02.

USB cable:

See Device cables#UNI-T_UT-D04.

Protocol

See Multimeter_ICs#Fortune_Semiconductor_FS9721_LP3 for the DMM IC protocol.

Depending on the cable, additional decoding is needed, though.

TODO: Serial cable vs. the two USB HID based cables.

A short protocol description is also available from Voltcraft/Conrad. And another one.

Resources

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