LLD SWEEP INPUT: Accepts 0 to + 10 V input to externally control the SCA’s lower
level discriminator; Z
in
≈ 5.1 kΩ; 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 µs 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 µs or 2.0 µs; factory set to 2.0 µs.
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 ≤1Ω.
DISC B – Jumper plug sets the rear panel DISC BNC connector as an OUTPUT or in
-
put; factory set to OUT.
40
Specifications
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