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 90E 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.
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