"tim....." wrote in message
...

"Arfa Daily" wrote in message
...
A few months back, my old mechanical meter was replaced with one of these
small white Landis & Gyr jobs that has an LCD display, and a small blue
button to cycle through the available displays of recorded units, totals,
time etc. I check it most days, and was surprised to find that this
morning, at 9am, it was still reading Economy 7 units - or whatever they
call them these days. A few minutes later, the reading had increased by
one, confirming that it was indeed still recording night units. I scrolled
through the readings, and was intrigued to find that the clock was 4 hours
slow, so the meter did indeed 'think' that it was still in the Economy 7
period.

So, does anyone know how the clock is set on these ? I was present,
chatting to the fitter the whole time he was doing the job, and I don't
recall him doing anything to the meter, other than removing it from the
box, screwing it to the board, and wiring it in.

Does it have large metal washer thingy embedded in it, probably under a
cover? I think that it's programmed through this somehow.

tim



There is no additional switching for the 'night-time' circuit, which is
actually just one storage heater in the extension, on its own timeswitch.
There *is* what looks like an optical port on the front. There are what look
like two standard 5mm LEDs with water clear encapsulation, side by side, and
visible through a clear window in the front of it. One of these LEDs flashes
red at the 'consumption rate', so is a LED equivalent of the paint marker on
the old rotating disc. The more power you are consuming, the faster it
flashes. I assume that the other 'LED' is actually a photodiode. When I
first saw it, I thought that the pair served as an optical interface for the
meter reader man, it not being a remotely readable type, but no. When the
guy came to read it for the first time a couple of weeks ago, he used a
torch (the LCD has no backlight ... ) and pressed the button to get the
various usage totals up, and then recorded them manually into his little
handheld thingy. Oh how technology improves our lives ... :-)

So, maybe it is a programming port, but I can't believe that the clock just
relies on being programmed right in the first place, does it ? Seems odd
that it is *exactly* 4 hours wrong now to the minute, but was correct when
checked yeaterday.

Arfa