- #1
hjerald1
- 3
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Hi all,
I am hoping that someone here on the Forum can provide this chemist with some electronics assistance .
I am working on setting up my newly acquired HPGe detector with my MCA system
The only thing I am missing is a HV bias supply shutdown in the event of a detector warm up.
I have obtained a circuit diagram (attached) for a HV shutdown, which I believe, senses a thermistor in the HPGe/Preamp.
Some questions:
First---Using a thermistor input (pin 8), how does this circuit function?
Second---What is the output voltage of the circuit assuming a thermistor value of
greater than 1.5K at cold temperature. What is the output voltage assuming
a thermistor value of less than 1K at warm temps.
Third--- On the diagram, what do WP? and PTR signify?
Thanks,
Jerry
I am hoping that someone here on the Forum can provide this chemist with some electronics assistance .
I am working on setting up my newly acquired HPGe detector with my MCA system
The only thing I am missing is a HV bias supply shutdown in the event of a detector warm up.
I have obtained a circuit diagram (attached) for a HV shutdown, which I believe, senses a thermistor in the HPGe/Preamp.
Some questions:
First---Using a thermistor input (pin 8), how does this circuit function?
Second---What is the output voltage of the circuit assuming a thermistor value of
greater than 1.5K at cold temperature. What is the output voltage assuming
a thermistor value of less than 1K at warm temps.
Third--- On the diagram, what do WP? and PTR signify?
Thanks,
Jerry