Studio Technologies 92 - Manual (Page 6)

Issue 1, December 2006 Model 92 User Guide
Page 6 Studio Technologies, Inc.
FK37-type connectors can be independent-
ly tested. Two of the display digits indicate
which specific pin is being tested. The other
two digits can display which pin (or pins)
are connected to the pin under test.
The Model 92 is capable of testing indi-
vidual cable assemblies where both the
male and female 37-pin connectors associ-
ated with a specific DT12 are accessible.
Referred to as the Model 92’s local system
mode, both connectors of the designated
cable assembly are terminated on the
Model 92. This mode is appropriate for
testing flexible cable assemblies that are
newly assembled or are being prepared
for temporary deployment. With rapid and
complete testing, DT12s will either be
confirmed as ready for use or “flagged” for
repair or replacement.
The Model 92 allows testing of DT12
“fanouts.” These cable assemblies typically
have a female or male 37-pin connector on
one end and twelve male or female 3-pin
XLR-type connectors on the other. Connect-
ing this type of fanout to the Model 92
is simple. In addition to male and female
37-pin connectors, the Model 92 also
provides two 3-pin XLR-type connectors,
one male and one female. Under software
control, a technician can “walk through”
the twelve channels, connecting one fanout
channel at a time. In addition to testing
fanouts, this feature can find use in testing
DT12-type cabling that terminates on patch
bays or breakout panels. As a “bonus” the
Model 92 also supports testing of standard
3-conductor audio cables that terminate on
XLR-type connectors.
A unique testing challenge is encountered
when DT12 cable assemblies have already
been “run” in preparation for a broadcast
event or have been permanently installed as
part of a facility’s infrastructure. Using the
master/slave system modes, two Model 92
units can work together to perform end-to-
end testing of in-place cabling. This unique
capability can be valuable for new installa-
tions as well as during routine maintenance
and repair. Using a separate cable path,
a bidirectional data link is established to
allow the two Model 92 units to coordinate
their resources. One unit is designated as
the master while the other is designated as
the slave. Two master modes ensure that
DT12 cable assemblies with either male or
female connectors on the master end can
be tested. While the buttons on the master
unit control the testing functions to be per-
formed, both units simultaneously display
the test status. BNC connectors are used
to establish the data link between the two
Model 92 units. This connector type was
selected because of its common use in
broadcast applications. However, cable
other than 75 ohm coax can also be used
for the data link, including microphone,
“CAT5” data, and multi-pair “telco.”
Four pushbutton switches, five LED indica-
tors, and a 4-digit LED display provide the
Model 92’s operator interface. The power
button is used to power up and power down
the unit. The power button is also used to
select which of the four system modes is
selected. Four LED indicators, one associ-
ated with each system mode, display which
mode is active. The up and down buttons
allow manual selection of the channel or
pins designated for testing. The up button
is also used to select which cable mode
is active. The down button is also used to
select between channel and pin mode. The
auto test button is used to enable the two
automatic test sequences. The LED display
indicates which of the twelve DT12 channels
or 37 individual connector pins is currently