LLD SWEEP INPUT: Accepts 0 to + 10 V input to externally control the SCA’s lower
level discriminator; Z
in
≈
5.1 k
Ω
; dc coupled.
Controls
COARSE GAIN – Rotary switch selects gain factors of X4, X8, X16, X32, X64,
X128.
FINE GAIN – Ten-turn precision locking dial potentiometer selects variable gain fac-
tor of X3 to X10.
P/Z – Front panel multi-turn screwdriver pole/zero adjustment optimizes the amplifier
baseline recovery and overload performance for the preamplifier fall time constant and
the main amplifier pulse shaping chosen; 30
µ
s to
∞
preamp fall time constant range.
INPUT – Toggle switch sets the Model 2015A for the polarity of the incoming
preamplifier signal.
TIME CONSTANTS – Internal pushbutton switch selects SHAPING TIME constant
of 0.5
µ
s or 2.0
µ
s; factory set to 2.0
µ
s.
LOWER LEVEL (E) – Ten-turn locking dial precision potentiometer selects a base-
line from 0.1 V to 10 V for the timing SCA mode, and 0 ±15 mV to 10 V for the nor-
mal SCA mode.
WINDOW (
∆
E) – Ten-turn locking dial precision potentiometer selects window width
from 0 to 10 V or 0 to 1 V depending on the position of the rear panel
∆
E RANGE
switch.
∆
E RANGE – Rear panel toggle switch selects the front panel WINDOW (
∆
E) range
as 0 to 10 V or 0 to 1 V, full scale.
LED INDICATOR – Aids in setting the LLD just above the system noise.
Internal Controls
Z
out
– Jumper plug selects AMP OUTPUT impedance of
≤
1
Ω
or
≈
93
Ω
; factory set
to
≤
1
Ω
.
DISC B – Jumper plug sets the rear panel DISC BNC connector as an OUTPUT or in-
put; factory set to OUT.
40
Specifications
Summary of Contents for 2015A
Page 1: ...Model 2015A Spectroscopy Amplifier Timing SCA User s Manual 9231694B 01 05...
Page 6: ...Notes iv...
Page 12: ...Internal Controls 6 Controls and Connectors Figure 4 Internal Controls...
Page 55: ......
Page 56: ......
