19
Sidekick
®
SYNC Test Set
3. Toggle the Up p arrow key to switch between Tip-
to-Ground and Tip-to-Ring.
Toggle the Down q arrow key to switch between
Ring-to-Ground or Tip-to-Ring.
Toggle the Left t arrow key to reverse the pair.
Toggle the Right u arrow key to switch between
the COAX connector and RJ-11 jack.
The upper left hand corner of the display will
indicate the connection method.
4. To exit the DC Volts measurement, press any other
Test Menu.
2.4 Stress Test
When Stress test is activated, the Sidekick SYNC
test set stresses the pair under test with a 90 dBrnC
longitudinal signal. This signal drives a current through
any fault present on the pair. The fault converts the
longitudinal current into metallic voltage at the fault,
which in turn produces high stressed noise readings on
the unit. These stressed noise (dBrnC) readings should
not be confused with noise metallic (dB) readings taken
with subscriber loop test sets. The Stress test is more
sensitive to pair imbalance problems than noise metal-
lic and ordinary longitudinal balance tests.
The 90 dBrnC signal, a simplex tone, is inaudible to the
subscriber as long as Tip, Ring, and Ground are con-
nected and the pair is balanced. If either Tip or Ring is
disconnected during testing, or the line is unbalanced,
the tone will become audible to the subscriber.
Because the Sidekick SYNC test set does not draw
loop current when performing the Stress test, there
is no need to dial a quiet termination for on-hook
measurements. This is also advantageous because
loop current drawn by standard noise measurement
sets can mask some faults. The two most ideal testing
conditions are working-idle lines (on-hook with battery)
and completely idle lines (disconnected from the C.O.,
Litespan
®
-2000, or pair-gain equipment).
The Stress test identifies and isolates:
•High joints or high resistance opens
(series resistance faults)
•Capacitive imbalances
(conductor lengths are unequal)
•Unbalanced load coils or build-out networks