My voltage reference unit arrived today from this seller:
http://www.ebay.co.uk/itm/400452242651?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1497.l2649GBP16.10
Ordered from Hong Kong on 22 June, arrived with me in the UK 27 June.... pretty good service
![Smiley :)](https://www.eevblog.com/forum/Smileys/default/smiley.gif)
My comment on it....
SUPERB ! ![ThumbsUp :-+](https://www.eevblog.com/forum/Smileys/default/icon_smile_thumbsup.gif)
It arrived wrapped in a soft 'silk' cloth to prevent scratches. It was then wrapped in 2 layers of bubble wrap before being paced in a padded envelope.
It includes the all important calibration certificate. I checked the output on my Fluke 87 III using its 4.5 digit mode. All readings tallied with the calibration certificate within the capabilities of 4.5 digits. I will test the unit on a calibrated lab multi-meter tomorrow.
For the money I consider this a bargain purchase. I definitely recommend buying the cased unit as the case protects the PCB and is very well made.
I can check its calibration any time I want with the office calibrated unit so I will effectively have a calibrated transfer standard.
![DMM :-DMM](https://www.eevblog.com/forum/Smileys/default/smiliey_dmm.gif)
Whoopee !
I purchased some close tolerance resistors last year so now I just need a current standard....time to look at the specs for this unit to see if it can drive a resistor load and what current it can produce
![Wink ;)](https://www.eevblog.com/forum/Smileys/default/wink.gif)
Otherwise I will use it as a voltage reference to build a simple current reference add-on. GBP16 well spent.
Picture attached
I have another in transit from China (this one came from HK) I will be ordering another from the HK supplier and it will be interesting to see how the three units age over the coming year. At GBP16 these really are worth having lying around the lab for a quick meter accuracy check.