Operation
High Voltage Adjustment
3
3-9
Figure 3-6. High Voltage Jumper Positioning
3.10 DETECTOR SENSITIVITY ADJUSTMENT
Refer to Figure 3-5 for location of the detector sensitivity adjustment (RP2). The adjustment is factory set
to 80 mV. If necessary, use a variable amplitude pulse fail generator and turn RP2 counterclockwise to
increase sensitivity.
3.11 JAM CURRENT ADJUSTMENT
Refer to Figure 3-5 for location of the jam current adjustment (RP1). Use the following procedure to
adjust the jam current:
1. Adjust RP1 fully counter-clockwise.
2. Bring the detector to a high-count rate until the reading begins to drop with increasing intensity.
3. Adjust RP1 clockwise until the jam message appears on the display.
An overrange message may occur during this
adjustment, indicating that the probe has reached
the limit of its deadtime correction; in this case, the
jam message may be set to appear above
overrange.
3.12 Changing the Response Time (Resp Time)
The Model 190 response time may be changed by pressing the front panel Resp Time push-button.
When Resp Time is pressed, the next response time will be selected and the following will appear on the
alphanumeric display:
RESPONSE IS XX S
NOTE
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