Studio Technologies 93 - Manual (Page 8)

Issue 1, January 2008 Model 93 User Guide
Page 8 Studio Technologies, Inc.
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 channel
1 or pin q. The continuous auto test mode
was specifically included for situations where
a more detailed view of the test results is
desired.
To ensure a thorough analysis of the con-
nection status of a W1 cable assembly the
Model 93 is capable of testing all 39 pins
of the male and female mating connectors,
organized as 36 individual pins and one
group of three pins. This allows confirma-
tion of correct channel wiring, as well as
detecting opens, shorts, and reverses (pair
crosses). All Model 93 input and output
circuits are extensively protected from dam-
age due to static discharge (ESD) and DC
voltages commonly found in field-production
and broadcast environments. These voltage
sources can include tally, intercom, IFB, and
microphone phantom power among others
that might be present on a W1 cable assem-
bly that has been designated for testing.
Contained within the Model 93’s enclosure
is a rechargeable 12 volt sealed lead-acid
battery. This will provide continuous opera-
tion in excess of eight hours before recharg-
ing is required. An external 12 volt DC power
adapter, provided with each Model 93,
allows simultaneous charging of the battery
and powering of the unit. Circuitry con-
tained within the Model 93 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 93, to conserve
the battery’s energy automatic shutdown
will occur after ten minutes of inactivity.
Under 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 un-
der the less-than-gentle field environments
the battery is securely clamped within the
Model 93’s enclosure. It’s expected that the
battery will provide correct operation for a
period of three to five years before replace-
ment 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 93 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 93 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 93 can also be powered up by
the presence of data on the master/slave
data link. This allows unattended operation
where the Model 93 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.
No matter whether the Model 93 is manually
or automatically powered up, the voltage
of the internal rechargeable battery is auto-
matically measured. A value of less than
10 volts will result in a low battery message
being displayed. This is followed by the