jumper at J4: U
H
= U
MCP
back
+ 168V
jumper at J5: U
H
= U
MCP
back
+ 224V (= U
ref
)
Changing this jumper position from the default setting can be beneficial for modified detector geometry (MCP holding plate at
a non-standard position) or if the effective MCP back potential is significantly shifted (use J1 position).
J7 and J8: placing a jumper on J7 or on J7 and J8 reduces the total voltage drop across the HVZ by 56V or 112V, respectively.
jumper at J7: positions J5 out of use, jumper at J4 provides U
H
= U
MCP
back
+ 168V = U
ref
.
jumpers at J7 and J8: positions J5 and J4 out of use, jumper at J3 provides U
H
= U
MCP
back
+ 112V = U
ref
.
These options can be beneficial if the effective MCP back potential is strongly shifted, or a lower anode voltage shall be used
for some reason (i.e. different anode type). If a larger voltage drop (beyond 224V between U
ref
and U
MCP
back
) is required it is
possible placing two HVZ units in series or combining a HVZ with a BA3.
J6: no jumper: U
sig
= U
ref
+ 36V (default)
if a jumper is set on J6, both Ref and Sig outputs provide the same potential as “HV in”.
This option allows using a BA3 or other floating battery device for producing the voltage difference between “ref” and “sig”
for a delay-line anode.
MCP Delay Line Detector Manual (11.0.1304.1) Page 77 of 83
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