Difference between revisions of "Voltcraft VC-840"

**Voltcraft VC-840**
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

Latest revision as of 02:28, 1 May 2013

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

Hardware

Multimeter:

Multimeter IC: Fortune Semiconductor FS9721_LP3 (datasheet)
Low power, True RMS-to-DC converter: Analog Devices AD737J (datasheet)
Unknown SO-8 chip: ?
Crystal: likely 4MHz (not verified, though)
Fuses: 10A/250V and 500mA/250V (one glass fuse, one HRV fuse)

RS232 cable:

See Device cables#UNI-T_UT-D02.

USB cable:

See Device cables#UNI-T_UT-D04.

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

@@ Line 1: / Line 1: @@
-[[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 CAT IV (600V) handheld digital multimeter with RS232 or (optional) 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 about the device.
 == Hardware ==
+'''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])
-* ...
+* '''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)
+'''RS232 cable:'''
+* See [[Device cables#UNI-T_UT-D02]].
+'''USB cable:'''
+* See [[Device cables#UNI-T_UT-D04]].
 == Photos ==
-TODO.
+'''Multimeter''':
+<gallery>
+File:Voltcraft vc840 device front.jpg|<small>Device, front</small>
+File:Voltcraft vc840 device back1.jpg|<small>Device, back</small>
+File:Voltcraft vc840 device back2.jpg|<small>Device, back w/o battery</small>
+File:Voltcraft vc840 battery1.jpg|<small>Battery 1</small>
+File:Voltcraft vc840 battery2.jpg|<small>Battery 2</small>
+File:Voltcraft vc840 pcb front.jpg|<small>PCB, front</small>
+File:Voltcraft vc840 pcb back.jpg|<small>PCB, back</small>
+File:Voltcraft vc840 ad737j.jpg|<small>Analog Devices AD737J</small>
+File:Voltcraft vc840 fs9721 lp3.jpg|<small>Fortune Semi. FS9721_LP3</small>
+</gallery>
+'''RS232 cable:'''
+See [[Device cables#UNI-T_UT-D02]].
+'''USB cable:'''
+See [[Device cables#UNI-T_UT-D04]].
 == 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 ==
-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]]