Canberra 2015A, Руководство пользователя

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A. Specifications
Inputs
INPUT – Accepts positive or negative linear pulses from associated preamplifier; am-
plitude:
±
10 V divided by the selected gain,
±
12 V maximum; rise time less than shap-
ing time constant; decay time constant 30
µ
s to
∞
; Z
in
≈
1 k
Ω
; front and rear panel
BNC connectors.
Outputs
AMP OUTPUT – Provides 10 V full scale unipolar OUTPUT; active filter
near-Gaussian shaping; dc restored; dc level is factory calibrated to 0
±
5 mV dc; short
circuit protected, front and rear panel BNC connectors; front panel Z
out
<1
Ω
or
≈
93
Ω
, internally selectable; rear panel Z
out
≈
93
Ω
.
SCA OUTPUT – Provides a nominally 5 V (unterminated) 500 ns positive pulse, de-
layed approximately 200 ns past the peak of the AMP OUTPUT signal; rise time and
fall time
≤
25 ns
;
Z
out
≈
50
Ω
; BNC connectors located on front and rear panels; short
circuit protected; OUTPUT amplitude can be changed to 8 V by means of an internal
jumper.
Input/Output
DISC – Rear panel BNC connector having a multi-function capability; lower level (E)
DISCriminator OUTPUT, upper level (E +
∆
E) DISCriminator OUTPUT, or LLD
SWEEP INPUT; one of these three modes is internally selected with jumper plugs;
shipped in E position.
When used as:
Lower Level (E) DISCriminator OUTPUT: Provides a positive 5 V (unterminated),
500 ns pulse; rise time and fall time
≤
25 ns; Z
out
≈
50
Ω
; the LLD pulse is generated
when the positive edge of the AMP OUT signal crosses the Lower Level (E) threshold
setting; OUTPUT amplitude can be changed to +8 V by internal jumper.
Upper Level (E +
∆
E) DISCriminator OUTPUT: Same as lower level DISCriminator
except the pulse appears when the AMP OUT signal crosses the threshold set by the
sum of the LOWER LEVEL (E) and WINDOW (
∆
E) controls.
39
Inputs