digiBASE
®
PMT Base with Integrated Bias Supply, Preamplifier and Digital Multichannel Analyzer
931003E / 0620
Figure 2
. Setting the Coarse Gain Jumper
!
With a 5/16-in. wrench, remove the nut on the ENABLE INPUT connector.
!
With a 0.050-in. Allen wrench, remove the 4 set screws that hold the shroud in place.
!
Slide the shroud off of the socket to expose the internal circuit boards.
!
Locate the 3-pin jumper on the rectangular board that does not have the USB connector
mounted on it.
!
Orient the digiBASE such that
the tube socket is to the right. In
this orientation, when the jumper
is on the left-most and center
pins, the coarse gain is 1. When
the jumper is on the right-most
and center pins, the coarse gain
is 3. The gain is 9 when the
jumper is removed. These set-
tings are illustrated in Fig. 2. To
avoid losing the jumper in this
high-gain setting, place it on just
one of the pins at a 90
E
angle to
the connector.
!
After putting the jumper in the
desired location, slide the shroud
back over the unit, carefully guid-
ing the USB and ENABLE INPUT
connectors through the holes in the
panel.
!
Replace the set screws.
!
Replace the washer and nut on the ENABLE INPUT connector.
CAUTION
Do not touch any components on the circular board
. Oils from your fingers
can contaminate the components and result in poor operation of the bias
supply.
4
Summary of Contents for ORTEC digiBASE
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