Difference between revisions of "V&A VA18B"
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* [http://www.velleman.eu/products/view/?id=372236 Velleman DVM1200] (USB), this is a [http://www.thebits.info/general/n56fu-172.htm#comment-6052 rebranded Mastech VA18B] (running "strings" on "PC-LINK.chm" reveals "VA17B", but that's also the case for the software that ships with the VA18B) | * [http://www.velleman.eu/products/view/?id=372236 Velleman DVM1200] (USB), this is a [http://www.thebits.info/general/n56fu-172.htm#comment-6052 rebranded Mastech VA18B] (running "strings" on "PC-LINK.chm" reveals "VA17B", but that's also the case for the software that ships with the VA18B) | ||
* [http://www.velleman.eu/products/view/?id=372566 Velleman DVM1400] (no PC connectivity) | * [http://www.velleman.eu/products/view/?id=372566 Velleman DVM1400] (no PC connectivity) | ||
* [http://www.maxwell-digital.com/index.php?tld=en&page=product&d1=new&d2=multimeters&c=04_25328 Maxwell MX-25328] (USB), this is a [http://www.eevblog.com/forum/product-reviews-photos-and-discussion/product-review-dmm-latest-va-mastech-va18b/msg115180/#msg115180 rebranded Mastech VA18B] (Maxwell wrote their own PC software though, apparently; we confirmed that is works fine with the Mastech VA18B, you just need to select "25328" as device in the Maxwell software) | |||
== Hardware == | == Hardware == | ||
Revision as of 14:14, 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
It seems there 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. Both should work fine with sigrok, as long as the respective driver creates a "virtual COM port" / serial port device sigrok can connect to.
Models:
- Mastech VA17B
- ...
Rebranding of Mastech multimeters in this series:
- Velleman DVM1000 (no PC connectivity)
- Velleman DVM1100 (no PC connectivity)
- Velleman DVM1200 (USB), this is a rebranded Mastech VA18B (running "strings" on "PC-LINK.chm" reveals "VA17B", but that's also the case for the software that ships with the VA18B)
- Velleman DVM1400 (no PC connectivity)
- Maxwell MX-25328 (USB), this is a rebranded Mastech VA18B (Maxwell wrote their own PC software though, apparently; we confirmed that is works fine with the Mastech VA18B, you just need to select "25328" as device in the Maxwell software)
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