The Model 106 is a positive edge triggered counts-to-volts converter
with high and low ranges for maximum flexibility. It is optimized
for interfacing to radiation detectors, but is also useful as an
upgrade for conventional frequency-to-voltage converters. The counter
input is optically isolated and the power ground is kept separate from the
chassis ground. These steps insure that the maximum analog accuracy
can be obtained under almost any circumstances. The frequency input
and analog output ranges can be factory set to suit the application.
The standard ranges are 1 volt out equals 100,000 counts per minute
in, and 1 volt out equals 12,000,000 counts per minute in. Both ranges
include zero. These ranges correspond to 0 to 1666 Hz and 0 to
200 KHz for a one volt output range. The standard high range extends
to 380 KHz at 1.9 volts out. The low range stays linear to over
4.5 volts, or 7.5 KHz (450,000 cpm).
The standard Model 106 is set for 5 volt signals at the counter
input. Other voltages can be accommodated. The input signal should
be able to source 2 ma in order to drive the optical isolation.
The filtration time constant for the Model 106 can be jumper selected
for 0.5 seconds or 2.5 seconds. In the 0.5 second position the
output settles to 18 bits in 4 seconds after an instantaneous
Linearity is typically 0.001% of full scale. When used with one
of Lawson Labs 24-bit A/D systems, the Model 106 can resolve
one Hertz out of 380 KHz.
A BNC connector is used for the input. The output uses a 9-pin
D-Sub connector. A matching connecter with hood is supplied.
+12 to +15 volts DC (regulated) at 25 ma.
The Model 106 is supplied in a steel enclosure. Dimensions are
6.0 x 3.7 x 1.250 inches. Weight is 22 ounces, not including the
external power supply.
In steel enclosure with power supply and matching
connector and hood. $375.00