I purchased an Instromet sunshine recorder a couple of years ago, and immediately noticed that the counter was incrementing at 39 second intervals rather than 36 (1/100th of an hour). This added approx. 8% to the sunshine total. I sent the recorder back to Instromet who recalibrated it, and it now records at exactly 36 second intervals has no blind spots as some people have suggested, and I believe it to be an excellent and very accurate recorder.


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I found that my Instromet sunshine recorder was registering 1/100th of an
hour every 37.5 seconds leading to it under-recording (after using it for 12
months)

I discovered there is an adjustment on the circuit board and using a
stopwatch it was quite easy to get the timing to 36 seconds per 1/100th on
the display.

Recently I timed it for 6 hours sunshine and found that it now under-records
by 33 seconds for 6 hours duration, which is about as good as I reckon it
could be.

How long it will be before it needs adjusting again is anybody's guess.
________________
Nick G
Otter Valley, Devon
80 m amsl
http://www.ottervalley.co.uk