[volt-nuts] Solartron 7061 help request (eeprom?) (Fred Schneider)
wje at quackers.net
Tue Feb 28 02:01:07 UTC 2012
I have several 7061's and 7081's. They're both excellent meters and tend
to hold calibration for a long time. My 7081 easily stays within a few
ppm/year. (checked against my Fluke-calibrated Datron 4910's)
In answer to a few of the questions recently asked:
The battery is only for backing up stored readings and settings. The
calibration values are in the eeprom, twice. So, unless it fails, you
won't lose the calibration factors. The purpose of the eeprom refresh is
just to do an read/erase/rewrite cycle. It was apparently a concern that
eeproms of that vintage wouldn't store values over long times (years)
reliably. I've not done a refresh on any of my 7061's and haven't had a
As for heat, the 7061's do run very hot, but that's how they were
designed. Not a good idea to put things on top of them without any
airspace, though. The hottest area in a properly working 7061 is a small
metal-shield box. It has some rather power-hungry IC's (74s series) in
it, and it gets too hot to touch. Every 7061 I've ever seen is like
that, so I assume it's operating as intended.
I wouldn't say the transformer runs hot in particular. If you're really
seeing that, it's possible you have leaky caps in the power supply,
although they'd have to leak a lot without exploding to raise the
current drain enough to overheat the transformer. More likely is that
it's a ventilation problem. Does your 7061 still have its feet to give
it some airspace at the bottom?
They said 'Windows or better'
so I used Linux.
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