User name brads
Log entry time 16:44:51 on November 02, 2007
Entry number 211745
This entry is a followup to: 211288
keyword=1458/1461N HV trip problemWow, the non-linear max current vs. voltage relationship in the 1461 is kind of strange. Note however that the 1440 crate has a similar 1 mA limit at 1 kV and it still works...
What is the measured current draw at say 400, 800, 1000, and 1200V on the 1458/1461N combo? Are you really riding the 1 mA line at 1kV?
FWIW I also notice that the 1461N spec sheet says that you can set a
hardware voltage limit "one per card". Though even if such a limit was
set, it probably wouldn't generate a trip, it would just stop ramping...
Might be worth checking if the 1 kV draw is under 1 mA though.
A copy of this log entry has been emailed to: camsonne@jlab.org
LeCroy 1461 current limit vs. voltage
LeCroy 1440 current limit vs. voltage
