USERS MANUAL
NR2306-O/G
REVISION
A
DATE
3-8-18
Page | 8
The range of acceptable Channel Amplitude can be narrowed around a connected
balanced line, so that a Channel Status below the Alert Threshold indicates a shorted line,
while a Channel Status above the Alert Threshold window indicates a potential
disconnected cable.
The threshold value at which a channel alert is triggered can be programmed on the Alert
Threshold screen or programmed via the RS232 port. Once set, the unit would continue to
monitor each channel and a deviation beyond the set limits would be reported as a failure
on the front panel and via RS232.
The Channel Status feature can quickly detect a cabling failure. Any change in the load
impedance will change the output voltage with respect to the divider formed by the output
impedance of the amplifier and the load impedance. Failing cables and connectors can be
detected early.
The current threshold limits are displayed in addition to the actual measured value. These
values reflect the percentage threshold defined in the Alert Threshold settings. If the output
value is too low to give a valid reading, t
he display will read “LOW.”
The status is displayed on the front panel and is accessible over the RS232 serial bus via
DB9. Channel Statuses can be cycled into view or can remain on a single channel. This
feature can be accessed via the NEXT button by advancing to the Channel Status screen.
To cycle through channels in sequence, press the SELECT button.
Status information is also accessible through the SNMP capability.
2.4 Status LEDs
There are three status LEDs which provide a quick indication of valid unit operation.
Alert LED:
The Alert LED will illuminate flashing RED to indicate A GNSS failure or a
power supply failure. The Alert LED will
not
flash RED if any valid input signal is present.
Oven LED (OCXO option only):
The Oven LED will illuminate to indicate an oven failure.
Oven LED (on-board GPS):
The Oven LED will illuminate steady GREEN if all on-board
GPS/GNSS units are locked. The LED will flash GREEN if at least one unit is unlocked.
