Ludlum Measurements 4612, Руководство пользователя

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Model 4612 Twelve-Channel Counter Technical Manual
Section 7
Ludlum Measurements, Inc. Page 51 November 2019
7. Connect the voltmeter between the LLD test point (+) on the rear
panel of Slave #1 and ground (-) (the screw head located just to
the right of the LMI logo on the panel). Check that the voltage
here is 100 mVdc ±5%.
8. Connect the voltmeter between the ULD test point (+) on the rear
panel of Slave #1 and ground (-) (the screw head located just to
the right of the LMI logo on the panel). Check that the voltage is
200 mVdc ±5%.
9. Observe the count rate for Channel #1. With an output time of
0.50 sec, the count rate should show a value of 333 ±2. With an
output time of 50 msec, the count rate should show a value of 33
±2. Adjust the gain control (GN) clockwise (located on the rear
panel of the slave board) to obtain the 333 ±2 (or 33 ±2) reading,
then adjust the control counter-clockwise to the point where the
counts just cease (less than 10 counts observed).
10. With the LLD = 100 and ULD = 200 for all channels, observe the
count rate for Channel #1. With an output time of 0.50 sec, the
count rate should show a value of 333 ±2 with the pulser
amplitude set to -15mV. With an output time of 50 msec, the
count rate should show a value of 33 ±2. Adjust the pulser
amplitude toward -20 mV and confirm that the reading drops to 0
(less than 10 counts) at -20 mV ±0.5 mV.
11.
Repeat steps 7 thru 10 above for all remaining channels.