Tektronix TG700, Руководство пользователя

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Operating Basics
Outputting an Alarm Signal When you enable the mainframe GPI, the TG700 can output an alarm signal
from pin 6 on the 10 BASE-T connector when an internal error occurs. Since the
output signal is an active low; the signal level for pin 6 goes from High to Low
when any errors occur. In addition, you can specify a BLACK output on the
AGL7 module as an alarm output.
NOTE.
The AGL7 must be running software version 4.6 or later to output an
alarm signal. Additionally, the AGL7 hardware must be at Version 3.x or above
to support outputting an alarm signal.
The alarm signal is output when one of the following internal errors occurs:
The fan stops working (GPI alarm only).
A genlock signal is not connected.
The TG700 does not lock to a genlock signal.
The frequency of the genlock signal and the internal reference shift
considerably, and the TG700 is near loss of lock.
The alarm signal output can be enabled using the GPI ALARM OUTPUT and
AGL7 ALARM OUTPUT menu items in the UTILITY submenu. These items
appear only after the mainframe GPI is enabled. (See page 2-39.) (See page 2-40.)
NOTE. After the instrument is powered on, it takes about three minutes to detect
a stable error signal (this time is required to stabilize the temperature in the
temperature-controlled oven in the internal reference oscillator). You can see
the remaining time before the alarm becomes effective in the AGL7 main menu
as shown below.
ALARM Menu.
When the mainframe GPI is enabled, the ALARM menu items are
displayed in the UTILITY submenu instead of the NETWORK menu item.
2–36 TG700 TV Signal Generator Platform User Manual