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Gossen Polysix calibration
Old 11-19-2013   #1
Mr_Flibble
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Gossen Polysix calibration

Picked up a Gossen Polysix light meter a week ago. It's consistently metering about a stop too low.

After opening it up I found 5 pot meters.

Any idea which ones I need to fiddle with to tweak the sensitivity?
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Old 11-25-2013   #2
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Alright, It looks like I need to adjust the two central ones on the main print (not the 3 off to the side). They're accessable through the two openings covered with the small rubber stops on the bottom of the housing.
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Old 10-12-2015   #3
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Old thread, I know. But since I couldn't find anything concrete on the matter I thought I would share my experiences here.

The two pots that Rick mentioned are indeed for calibrating the meter. Remove the rubber bungs with a needle or similar. As seen from the base of the meter, battery compartment facing bottom, the left pot is for the low light range (red) and the right hand pot is for the high range (green).

Both get more sensitive when adjusted clockwise. Mine gave one stop under-exposure in both high and low ranges. Adjusting each pot a fraction of a turn clockwise did the trick.

I tested pointing towards a grey rather uniform cloudy sky, a middle grey card facing a diffused window (meter facing away from window in other words), and an indoor white wall under a combination of tungsten and diffused natural light.

It is a good idea to test if both ranges are calibrated with respect to each other. For instance set to 20 degrees and ISO 400, f5.6 and 1/125s can be read on both scales.
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