Manual

Page 10
2.2 The Cab Filter
If the Test Set has Cab Filters, then all AC functions may select one
frequency to be measured. This is invaluable when multiple cab
signals are being sent, as it negates the need to turn off one of the
cab signals to measure the other one. The Signal Select Switch is
simply placed in the position indicating the frequency to be mea-
sured. All functions behave the same, except that only the signal of
interest is measured.
2.3 Autopolarity
2.3.1 Auto-Polarity
For all DC functions, the Test Set works in the auto-polarity mode.
The highest level peak of either polarity and its timing parameters
will be measured. In this mode, the Pointer will always deflect up-
scale, with the NEG Indicator lighting for signals of negative polar-
ity. The highest level peak of either polarity and its timing param-
eters will be measured.
2.4 Power Supply Features
2.4.1 The Sleep Feature
Since the Test Set relies on batteries for operation, a battery saving
feature has been incorporated to extend the battery life if acciden-
tally left on. This is known as the Sleep mode. After approximately
five minutes of non-use (Pointer at less than 1% of scale and no
range switch changes) the Test Set will power down, reducing bat-
tery drain and extending battery life. This mode is indicated by the
Pointer deflecting down scale into the Sleep Zone. To reactivate the
Test Set, simply rotate the Range Switch. NOTE: DURING SLEEP,
THE TEST SET WILL NOT RESPOND TO ANY INPUT.