3900001 Rev. C
Page 15 of 24
User Manual
Issue
02
/
February 2015
/
Shasta User Manual
Shasta High Voltage Power Supply
Setting kV and mA Set Points
The kV and mA set points are set by providing an analog voltage to the ‘kV Prog’ and ‘mA Prog’ inputs.
The input range for these analog inputs is 0.0V to 10.0V.
NOTE: The Shasta supply provides a 10.0V reference on pin 1 of J5 that can be
used as the high end for the host’s analog outputs. Use of this reference voltage is
recommended, but not required.
For kV Prog, 0.0V corresponds to 0 kV, 10.0V corresponds to 50kV for 50kV models and 60kV for 60kV
models, Accuracy 1%
For mA Prog, 0.0V corresponds to 0 mA and 10.0V corresponds to 1.0 mA, Accuracy 1%
NOTE: For proper operation, the PROGRAM inputs must be low noise, with a peak to peak
noise of less than five millivolts. Noisy input signals will result in unstable X-ray flux.
Local Control Setting
The local control m
ay be set by using the ‘kV Adj’ and ‘mA Adj’ potentiometers on the front panel of the
unit.
Connect pins 3 and 4 of J5 together, adjust the ‘kV Local’ potentiometer while monitoring pin 3 of
J5 ‘kV Prog Input’ to set the output voltage
Connect pins 6 and 7 of J5 together, adjust the ‘mA Local’ potentiometer while monitoring pin 6 of
J5 ‘mA Prog Input’ to set the output voltage
Remote Setting Control
The remote control may be set by applying positive voltages to the ‘kV Prog Input’ and ‘mA Prog Input’
pins. In this case, the ‘kV Local’ and ‘mA Local’ potentiometers are not used.
Apply a positive voltage on pin 3 of J5 ‘kV Prog Input’, the negative of the applied voltage should
be
connected to pin 9 of J5 ‘GND’
Apply a positive vol
tage on pin 6 of J5 ‘mA Prog Input’, the negative of the applied voltage should
be connected to pin 9 of J5
‘GND’
