Amplifier failure

A note on the recent amplifier failure on the Mosaic II camera

Here is a schematic layout of Mosaic 2:

The CCD4, amplifier A died in 2009. Hence, nothing is read out from this part of CCD4. You have two options:

• (1) observe in 16 channel mode, and 1/16 of your image will not be usable.

An example image is shown here (click to enlarge):

[1]
* In 16 channel mode the read-out time is 100 s

• (2) observe in 8 channel mode and read out through the b amplfiers.

The whole image will be usable as seen here:

[2]

In 8 channel mode the read-out time is 150 s

Back To Mosaic II [3]