Studio Technologies 92 - Manual (Page 8)

Issue 1, December 2006 Model 92 User Guide
Page 8 Studio Technologies, Inc.
progresses. Whenever a defective channel
or pin is detected the sequence will pause
momentarily while the right two digits dis-
play the applicable error information. The
test sequence will then continue on to the
next channel or pin. After a slight pause for
the summary results to be displayed, test-
ing will continue, again starting with chan-
nel 1 or pin 1. The continuous auto test
mode was specifically included for situa-
tions where a more detailed view of the test
results is desired.
To ensure a thorough analysis of the con-
nection status of a DT12 cable assembly
the Model 92 is capable of testing all 37
pins of the male and female mating con-
nectors. This allows confirmation of cor-
rect channel wiring, as well as detecting
opens, shorts, and reverses (pair crosses).
All Model 92 input and output circuits are
extensively protected from damage due
to static discharge (ESD) and DC voltages
commonly found in broadcast environ-
ments. These voltage sources can include
tally, intercom, IFB, and microphone phan-
tom power among others that might be
present on a DT12 cable assembly that has
been designated for testing.
Contained within the Model 92’s enclosure
is a rechargeable 12 volt sealed lead-acid
battery. This will provide continuous opera-
tion in excess of eight hours before re-
charging is required. An external 12 volt DC
power adapter, provided with each Model
92, allows simultaneous charging of the bat-
tery and powering of the unit. Circuitry con-
tained within the Model 92 implements the
actual battery charging function, minimiz-
ing recharge time while maximizing battery
life. While the power button can be used to
manually turn off the Model 92, to conserve
the battery’s energy automatic shutdown
will occur after ten minutes of inactivity. Un-
der software control, automatic shutdown
will also occur whenever the battery voltage
reaches its minimal acceptable value. This
prevents the battery from reaching a deep-
discharge condition. For reliability under the
less-than-gentle field environments the bat-
tery is securely clamped within the Model
92’s enclosure. It’s expected that the battery
will provide correct operation for a period of
three to five years before replacement will
become necessary. A competent technician
should be able to perform the task in well
under 30 minutes.
Overview
Power On and Off
There are two ways that the Model 92 can
be brought to its operational state, i.e., be
“powered up.” One is manual and the other
is automatic. To manually apply power to
the Model 92 tap the power on/off button. A
short “power up” sequence will commence,
first testing the LED displays and indica-
tors, and then briefly displaying the unit’s
software version number. The unit will then
display four dashes, indicating that testing
can now begin.
The Model 92 can also be powered up by
the presence of data on the master/slave
data link. This allows unattended operation
where the Model 92 unit that is designated
as the “master” can “wake up” its compan-
ion unit. The master unit will send out data,
“waking up” the slave unit. In this case the
normal power up sequence will take place,
with the exception that at the end of the se-
quence the unit will be forced into the slave
mode.