ADC Setup
Please refer to your ADC user’s manual for specific ADC operating instructions.
Set the ADC’s GAIN and RANGE equal to the MCA memory group size. For in-
stance, set the GAIN and RANGE to 4096 for an MCA with a 4096 channel memory
size.
Set the ADC controls to:
LLD · · · · · · · · · · · 0.02 V (fully counterclockwise)
ULD· · · · · · · · · · · 10.5 V (fully clockwise)
Digital Offset · · · · · · All Off
Peak Detect · · · · · · · Delayed
With a low count rate, use the ADC’s Inspect test point to set the ADC’s Peak Detect
Delay to be greater than the SCA’s Output pulse. Refer to “ADC Peak Detect
Adjustment” on page 44 for the procedure to be followed.
Spectroscopy Operation
Please refer to your MCA user’s manual for specific MCA operating instructions.
Start acquiring data in the MCA using the
55
Fe radioactive source previously placed
near the detector. A spectrum should begin to appear on the MCA’s display.
Adjust the Amplifier’s GAIN so that spectrum is positioned conveniently on the dis-
play.
Use the Amplifier’s Super Fine Gain (SFG) when matching gains of other detectors, or
when establishing a specific gain (energy per channel). This control provides 100
times more resolution than the Fine Gain Control.
11
ADC Setup
