electrometer circuit for QE

Sunday 18 March 2012 - Filed under Uncategorized

electrometer circuit for QE

This is a sketch of the circuit used
to readout the current with an electrometer during QE measurement on photocathode deposited on Chalice.

It was found the signal to noise ratio when using the mono-chronometer was poor. The noise level observed in the electrometer was
unacceptably large. It is believed to be the result of poor ground definition and connections. Also the cables between the Chalice pins are long and unshielded. The connections to the Twinax signal pickup and the V-source (coax) are suspect.

Ed May

2012-03-18  »  edmay