5.3 BA3 battery unit
It is usually sufficient to operate the delay-line with a voltage difference of 20 to 50V between the reference and the signal wires.
To supply this constant voltage offset between the wires a battery can be used. The
RoentDek BA3 battery pack provides
this offset with values between 35 and 40V (nominally 36V, without load 38 - 39V).
If you want to use the BA3 for supplying the wire potentials you need to connect the SHV output “HV +36V” to the U
sig
input
of the FT12/16-TP plug and the other SHV output “HV” with the U
ref
input. The desired potential for the reference wire
(U
ref
) must be supplied to the SHV input. “HV input” of the BA3’s opposite side.
Note, that the battery is not discharged during normal operation as no current is flowing between U
ref
and U
in
. Even in the
presence of a short on the delay-line anode, there is still a 1MΩ resistance between the poles of the internal battery pack. The
lifetime of the battery pack is therefore very long (several years). The individual batteries are standard 12V cells which can be
found for example in camera shops. If you need help in replacing the battery please contact
RoentDek.
Figure 5.7:
RoentDek BA3 battery box. The voltage input is on the left side, the output connectors (here as
reserve SHV) on the right side. The input voltage is routed to the upper voltage output (for U
ref
)) and produces
with the internal battery pack the signal voltage U
sig
= U
ref
+ 36V (nominally) on the lower output connector.
MCP Delay Line Detector Manual (11.0.1304.1) Page 73 of 83
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