Canberra 2015A, User Manual

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Model 2015A AMP/TSCA
Features
■
Spectroscopy grade
amplifier with high count rate
restoration
■
Timing single channel
analyzer with:
■
SCA and LLD or ULD
outputs
■
LLD threshold indicator for
easy set-up
■
Preamp leading edge timing
■
Designed for use with pro-
portional counters, NaI(Tl),
Ge, and Si detectors
Phone contact information
Benelux/Denmark (32) 2 481 85 30 • Canada 905-660-5373 • Central Europe +43 (0)2230 37000 • France (33) 1 39 48 52 00 • Germany (49) 6142 73820
Japan
81-3-5844-2681 •
Russia
(7-495) 429-6577 •
United Kingdom
(44) 1235 838333 •
United States
(1) 203-238-2351
For other international representative offices, visit our web site: http://www.canberra.com or contact the CANBERRA U.S.A. office. CSP209 1/07 Printed in U.S.A.
Description
The CANBERRA Model 2015A combines, in one single width
module, a spectroscopy amplifier with gated baseline restora-
tion and a timing single channel pulse height analyzer.
The 2015A amplifier employs a simple gated baseline restorer
which, because of its symmetrical characteristic, provides high
resolution for HPGe detectors at low and high counting rates.
Although it is a high performance instrument, the Model 2015A
is also very versatile. It has all the characteristics necessary
to make it useful with scintillation detectors, gas proportional
counters, and silicon detectors. High gain, low noise, select-
able time constants, and count rate optimization are several of
the more important features designed into the amplifier of the
Model 2015A.
The utility of the Model 2015A derives from the dual function of
its pulse height analyzer circuitry. In the SCA mode of opera-
tion, a logic signal output is generated whenever the amplifier
unipolar signal falls between the energy levels determined by
the front panel controls (E and
∆
E). This mode is especially
useful when a wide dynamic range is required.
In the Timing (TSCA) mode the same logic signal is generated,
but it is referenced in time relative to the leading edge of the
preamp signal. This provides a signal that is useful in applications
requiring time coincidence.
In addition to the SCA OUTPUT, the Model 2015A also provides a multifunc-
tion capability which can be programmed internally to provide a lower level
(E) Discriminator Output, or an upper level DISCriminator (E +
∆
E) Output
or to provide an external input level for remote control of the lower level
discriminator.
Precise repeatable performance is designed and built into the 2015A. The
front panel variable controls of the Model 2015A are precision ten-turn poten-
tiometers. The precision of the
∆
E window setting can be further enhanced
by use of rear panel sensitivity selector switch (
∆
E Range). A front panel
LED indicator is provided to assist in set up and troubleshooting. The LED
is activated from the lower level discriminator and is useful for setting the
discriminator just above the noise.
Specifications
INPUTS
■
INPUT – Accepts positive or negative linear pulses from associated preampli-
fier; amplitude: ±10 V divided by the selected gain, ±12 V maximum; rise time
less than shaping time constant; decay time constant 30 µs 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
.