Equipment information:

EG&G Princeton Applied Research 162 Other
EG&G Princeton Applied Research
Model: 162
Date: 1982
Category: Measurement instruments
Group: Other
Description: Boxcar Averager
                                    2.1	INTRODUCTION

The Model 162 Boxcar Averager can be combined with one or
two Model 163 or 164 Processor Modules to form a gated
signal-recovery system of exceptional versatility. This
system synchronously samples the input signal with an
aperture that can be fixed at any point on, or slowly
scanned across, the input signal. The signal passed through
the aperture is applied to a variable time constant
integrator, the output of which is the average of some
number of repetitions of the input signal over the aperture
duration. Because the average value of noise over a large
number of repetitions is zero, an improvement in
signal-to-noise ratio occurs, if the aperture is fixed on a
single point of the input signal, the output of the
Processor Module rises asymptotically towards the average
value of the input signal at the sampled point. If the
aperture is scanned across the input signal, the synchronous
waveform is reproduced at the output at the scan rate.

The Model 162 Mainframe contains most of the timing and
control functions, as well as the output signal-processing
circuitry. There is provision for supplying the
gated-and-averaged signal from either channel to the
mainframe output. Alternatively, one can select the
difference between the two gated-and-averaged signals at the
mainframe output. With the addition of optional
signal-processing circuit cards, the Model 162 can provide
an output consisting of the product, ratio, or log of the
ratio of the two averager channel outputs. Use of the
digital storage option ailows signals at extremely low
repetition rates to be averaged. Prior to being made
available at the Output connector, the mainframe output
signal (ร smoothed by a iow-pass filter. The time constant
of this filter is adjustable from 100 ^ts to 100 ร.

Front-panel delay controls are provided that permit the
aperture m each channel to be delayed independently from
about 5% to 100% of the Delay Range, selectable in 1-2-5
sequence from .1 แร to 50 ms. Pushbutton switches give a
choice of external, internal, or line triggering, and permit
independent selection of manual or automatic scanning for
each channel. The scan time, the time required to scan the
aperture across 100% of the selected Delay Range, can be set
to any value from 10 2 ร to 10s ร.

Each of the Processor Module types provides a unique set of
operating characteristics, allowing the input parameters of
the Model 162 to be optimized to a very wide range of
signal-recovery applications. The Model 163 Sampled
Integrator module utilizes a Sampling Head to achieve
aperture resolutions from 100 ps to 1 ns according to
the Sampling Head selected. The input sensitivity is
switch-selectable from 100 mV to 1 V full-scale. There is
provision for selecting the number of samples averaged and
for baseline sampling. This latter function provides
automatic compensation for dc drift and the effects of
baseline wander.

The Model 164 Gated Integrator module offers a choice of
aperture widths ranging from 10 ns to 5 ms. Pushbutton
switches allow a choice of 50 Q or 1 Ml) input impedance, ac
or dc coupled, and the choice of either linear or
exponential averaging. Both the module gain and aperture
duration can be trimmed to provide an exact match between
modules if two Model 164’s are to be used in dual-channel

Both the Model 163 and the Model 164 provide output and
aperture monitors, output reset switches, and an Overload
lamp to indicate overload Both modules also provide a choice
of the number of samples averaged. เท the Model 163, a
single switch selects the number of samples of which the
output is the average. เท the Model 164, the averaging Time
Constant, together with the selected Aperture Duration,
determines the number of samples of which the output is the

The built-in flexibility of the Model 162 makes it suitable
for handling almost any application involving the
examination of repetitive signals. Use of the ratio option
in dual-channel operation, for example, permits automatic
source compensation for fluctuations in the excitation power
of pulsed lasers and transducers. Dual-channel operation
also permits single-unit instrumentation in complex
experiments such as time-shared dual-beam spectroscopy. As a
single-channel or dual-channei gated averager, the Model 162
is ideally suited to such applications as time of flight
studies, plasma physics research, fluorescence and
phosphorescence decay, non-destructive testing, and
turbulence studies in fluid mechanics. The use of plug-in
signal channel modules and plug-in optional
signal-processing function cards, when combined with its
many built-in operating features, makes the Model 162 Boxcar
Averager the most versatile gated signal averager available.

These manuals are available for the above equipment:

EG&G Princeton Applied Research -- 162 -- Service Manual
File name: EGG-8001-Manual-Page-1-Picture
Manual Type: Service Manual
Pages: 136
Size: 9.80 Mbytes (10279525 Bytes)
Language: english
Date: 01 January 1982
Quality: Scanned document, all readable.
Upload date:
MD5: 6db16453565107c4e370c5a2f6f55e61
ed2kID: db2c096e18ad94777cbe44914144c130
Downloads: 43 since 03 September 2016
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