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Re: [OM] OM2n vs OM4 Opinion Sought - UPDATE

Subject: Re: [OM] OM2n vs OM4 Opinion Sought - UPDATE
From: "Giles" <cnocbui@xxxxxxxxx>
Date: Fri, 4 Feb 2000 00:52:54 +0000
Volkhart

Your figure of 20-25 microamps I believe is incorrect.  Rather than wait 
for the standby (off) mode to occur, switch the shutter speed ring to 
manual 60 or B then the initial reading should be of the standby drain.  
This worked for me even though John details a different method.

Here is what John Hermanson posted on the subject a while back.

>>>
A 4 must go through the entire "meter on" cycle with ammeter leads attached
before drain can be measured.  Use a quality DVM that will read microamps
accurately.   Plus lead to battery, negative lead clipped to lens mount.
Make sure ss dial is not on mechanical B or 60. While holding plus lead to
top of battery sitting in battery box,  in one continuous motion, push
meter switch to battery check and then immediately to auto. Now  you must
wait 90 seconds (not sure) for the meter to turn off automatically.  You'll
know the meter turns off by the sudden drop in your ammeter reading.   
Thgis last reading is your idle or standby drain. A high drain 4 will be
around 35 micro amps (Or .035 milli amps).  A better 4 is  10 microamps or
less.

John
<<<

Giles

Volkhart Baumgaertner wrote:

> battery, the other against the metal of the camera bottom part. This will
> switch on the camera's electronics, so as what you want to measure is
> standby drain you will now have to hold the leads in place until it shuts
> off (this is the tricky part, as each slip will force you to start over).
> When the camera goes into standby a value of 20-25 microamps is normal for
> an OM-4; if it is considerably higher it probably has the battery drain
> problem. Of course, even an OM-4 that shows normal values will drain the
> batteries much faster than a 1(n) or 2(n).
> 

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