Manual

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1.2.2 Measurement of Code Parameters
The measurement of code parameters has been made simple and
accurate. No longer is it necessary to count pointer swings to mea-
sure code rate. On time can be measured on live signals as well as
relay contacts. Peak levels can be determined quickly and auto-
matically. Adjustment to the code equipment peak level can also be
made without constantly readjusting the Test Set.
1.2.3 Expandable
Optional circuit boards may be installed to allow for the filtering of
60 Hz, 100 Hz, 200 Hz, or 250 Hz cab signals. The base unit may be
upgraded at any time to include these filters without loosing the
initial investment.
1.2.4 Four Models
The 2000 Series currently consists of four models. The base Model
2000 has all the features mentioned above with the exception of the
Cab Filters. The Model 2001 includes selectable 100 Hz and 250 Hz
Cab Filters. The Model 2002 includes selectable 100 Hz and 200 Hz
Cab Filters. The Model 2003 includes selectable 60 Hz and 100 Hz
Cab Filters.
1.2.5 Selectable DC Amps Polarity
The DC Amps function has selectable polarity. This is useful for mea-
suring the transmit and receive currents in pulse coded track cir-
cuits.