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Entry  Thu Nov 12 14:31:27 2020, gautam, Update, Electronics, SR560s in need of repair/battery replacement IMG_8947.jpg
    Reply  Tue Nov 17 00:26:32 2020, rana, Update, Electronics, SR560s in need of repair/battery replacement 
Message ID: 15674     Entry time: Thu Nov 12 14:31:27 2020     Reply to this: 15679
Author: gautam 
Type: Update 
Category: Electronics 
Subject: SR560s in need of repair/battery replacement 

I had to go through five SR560s in the lab yesterday evening to find one that had the expected 4 nV/rtHz input noise and worked on battery power. To confirm that the batteries were charged, I left 4 of them plugged in overnight. Today, I confirmed that the little indicator light on the back is in "Maintain" and not "Charge". However, when I unplug the power cord, they immediately turn off.

One of the units has a large DC output offset voltage even when the input is terminated (though it is not present with the input itself set to "GND" rather than DC/AC). Do we want to send this in for repair? Can we replace the batteries ourselves?

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