Miranda Cadius II Calibr. Help?

[Tom1956]

Presently I have up on my table a Miranda Cadius II that is working, but not accurate. At this point I can't say if cells have lost sensitivity or linearity until I attempt a calibration. I've posted a pic of the meter with back plate removed, revealing the calibration pots. Now, which is which, is my question. But I can find very little at all online about this; and certainly no service info. Anybody?. Thank you.

 

[MattKing]

I don't have any specific advice, but Miranda was used to re-brand a fair number of items in the UK (I think), so you may find info under other names.

 

[AgX]

I assume that each potentiometer controls another section of the metering range.

Thus mark the current setting, clean the potentiometer gliders and then start with one and check where its effect is located.Then start calibrating the meter section by section.

(Of course the cell voltage must be correct.)

 

[shutterfinger]

Your pix modified. Adjust the center screw under the meter movement to set the needle over the 0 or null point whichever is appropriate for a meter using this type of movement.


The zero screw has a limit to the number of turns it will make and if close to one extreme it will limit the needle movement or cause the needle to bind.
This type of meter movement is sensitive to sharp blows.

 

[AgX]

The center screw only adjuts the zero-position of the needle. And as you can see that is calibrated sufficently already (I assume a flat lying meter.)

Tom, re-painting the needle would be another task.

 

[shutterfinger]

I suppose you found this: http://www.mirandacamera.com/_accessories/_meters/meters_cadius.htm
Very similar to Gossen light meters.

 

[Tom1956]

I suppose you found this: http://www.mirandacamera.com/_accessories/_meters/meters_cadius.htm
Very similar to Gossen light meters.

Yes I saw that. But the Miranda is Japanese and the Gossen is German. I can see no reason to believe that pot locations and usage would be identical.

 

[Paul Goutiere]

Does the meter read high or low and by how many stops?

 

[Tom1956]

By AGX's input, presuming no suitable answer come in on this thread, I figure 1 will be the battery test pot, one will be high, and one will be low. And I'll just have to tinker till I get which is which. To answer Paul, I don't remember how far off as I'm not working on it this minute. But I do remember that last time I fooled with it I was afreaid the CdS cell might have lost too much linearity and thus borderline bad or actually bad. But at that time I didn't have APUG at my (gracious) disposal.

 

[AgX]

killing two birds with one stone

Tom, if you do so you might consider substituting the Mercury cell by a Silver-Oxide cell, and calibrating for the new voltage by just those potentiometers the same time.