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Boxcar Averager  SR235 ... from $1500 
SR235 — Analog math processor w/ 36 functions 
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SR235 Analog Math Processor

The SR235 Analog Processor provides a variety of convenient signal processing functions on up to two inputs. Background subtraction, ratioing and logarithmic compression are just a few of the functions which can be implemented with the SR235. With its many output functions, high accuracy, and variable filtering and gain, the SR235 is the perfect addition for any boxcar system—especially those in which a computer is unavailable to perform signal processing. 
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SR235 Analog Math Processor
The SR235 Analog Processor provides a variety of convenient signal processing functions on up to two inputs. Background subtraction, ratioing and logarithmic compression are just a few of the functions which can be implemented with the SR235. With its many output functions, high accuracy, and variable filtering and gain, the SR235 is the perfect addition for any boxcar system—especially those in which a computer is unavailable to perform signal processing.
The SR235 outputs a voltage proportional to a function of an argument formed from its two inputs, A and B. Allowable arguments are: A, B, √(A^{2} + B^{2}), AB, A×B/10, and 10A/B. The functions that can be selected are: x, x^{2}, √x, lnx, dx/dt, and (dx/dt)/100. Filtering can be performed on the argument with time constants from 0.3 ms to 30 s.
SR235 Analog Math Processor  
General  
A and B inputs  1 MΩ input impedance. Operating range ±10 V, protected to 100 V 
Input offset  <2 mV 
Argument (x)  A, B, √(A^{2}+B^{2} ), AB, A×B/10, and 10A/B 
Argument filter  Time constants from 0.3 ms to 30 s in a 1310 sequence. When OFF, the argument is unfiltered. 
Gain  0.1 to 20 in a 125 sequence 
F(x) output  x, x^{2}, √x, lnx, dx/dt, and (dx/dt)/100 
Frequency range  dx/dt to 10 Hz, (dx/dt)/100 to 1 kHz, √(A^{2}+B^{2}) to 20 Hz, and all others from DC to 50 kHz 
Accuracy  Gain, 2 %; rms sum, 3 %; difference, 1 %; multiplication, 2 % of full scale; division (with denominator >0.1), 3 % of full scale; lnx, x^{2}, √x are accurate to ±20 mV (referenced to input or output, whichever is less); dx/dt and (dx/dt)/100, 5 % 
Power  +24 V/120 mA, 24 V/80 mA. 5 W 
Mechanical  Singlewidth NIM standard 
Warranty  One year parts and labor on defects in materials and workmanship 