Chapter 3 Operating Instructions
Operation
CAUTION
:
Do not turn on the BIAS Switch until the proper bias
voltage has been set. See Setting Bias the First Time
on page 10.
Using the front panel switches you can select any of eight items for display. See
Figure 5. Front panel switches also allow you to adjust settings, control the
counter/timer and turn the bias voltage on and off.
Figure 5 Front Panel Switches
The INCrement/DECrement and DIGIT SELECT Switches are used to control the
display function and to change the 7401’s settings. To change the display function,
first make sure that no single digits are blinking. If a single digit is blinking, press the
DIGIT SELECT Switch one or more times until all digits are steadily lit. Then use
the INCrement/DECrement Switch to choose a different function. The selected
function’s LED will turn on.
If all digits on the display are blinking at once, an overrange condition exists. In this
case, the function can be changed using the INCrement/DECrement Switch.
Four instrument settings can be adjusted using the front panel controls: Preset Time
(P-TIME), BIAS, DISCriminator Energy, and CALibration pulser energy.
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7401/7401VR Alpha Spectrometer User’s Manual - 9231603C
