Difference between revisions of "V&A VA18B"
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See [[Mastech VA18B/Info]] for more details (such as lsusb -vvv output) about the device. | See [[Mastech VA18B/Info]] for more details (such as lsusb -vvv output) about the device. | ||
== Model overview == | |||
There seems to have been at least two different revisions of the multimeter (or at least of the PC-Link cable). The older one used a Sunplus SPCP825 USB-to-serial chip (see [http://www.mikrocontroller.net/topic/160215#2032176], also the software from [http://www.elv.de/digital-multimeter-va18b-mit-pc-link.html here]), the newer revisions use a Prolific PL2303 chip. | |||
Rebranding of Mastech multimeters in this series: | |||
* [http://www.velleman.eu/products/view/?id=372254 Velleman DVM1000] (no PC connectivity) | |||
* [http://www.velleman.eu/products/view/?id=372240 Velleman DVM1100] (no PC connectivity) | |||
* [http://www.velleman.eu/products/view/?id=372236 Velleman DVM1200] (USB), rebranded [http://www.mastech.com.cn/html/en/products-va15-17.htm Mastech VA17B] (run "strings" on some software files) | |||
* [http://www.velleman.eu/products/view/?id=372566 Velleman DVM1400] (no PC connectivity) | |||
== Hardware == | == Hardware == | ||
Revision as of 10:38, 23 June 2012
The Mastech VA18B a.k.a. V&A VA18B (V&A is a brand of Mastech) is a CAT II (1000V) handheld digital multimeter with USB connectivity.
See Mastech VA18B/Info for more details (such as lsusb -vvv output) about the device.
Model overview
There seems to have been at least two different revisions of the multimeter (or at least of the PC-Link cable). The older one used a Sunplus SPCP825 USB-to-serial chip (see [1], also the software from here), the newer revisions use a Prolific PL2303 chip.
Rebranding of Mastech multimeters in this series:
- Velleman DVM1000 (no PC connectivity)
- Velleman DVM1100 (no PC connectivity)
- Velleman DVM1200 (USB), rebranded Mastech VA17B (run "strings" on some software files)
- Velleman DVM1400 (no PC connectivity)
Hardware
Multimeter:
- ...
USB cable:
- Prolific PL2303HX YR0903A
- 12MHz crystal
Photos
Device, front
PCB, front
PCB, back
USB cable
USB cable PCB, front
USB cable PCB, back
Protocol
14-byte LCD segments over USB-2-serial (Prolific PL2303 chip, 2400 baud, 8n1), see various links below.
To enable output to the PC on the multimeter you have to keep the "Hz/DUTY" key pressed while powering on the device.
Resources
- Protocol descriptions: [2], [3], [4]
- EEVblog forums: Product review: DMM latest V&A Mastech VA18B