BIRD AT-400 Antenna Tester AT-400, Operator'S Manual, Page: 23 / 57

Basic Operations
11
Messages
There are five utility messages that can be displayed to
inform you of equipment, or procedural, conditions.
“Lo Batt” is displayed when battery voltage is less than 6.6V,
refer to maintenance section for charging batteries.
“Busy” is displayed during mode changes indicating the
measurement information is being updated.
“Hold” is displayed when in the Swept Frequency mode, and
Single Hold is the selected sweep type.
“Pass” or “Fail” will be displayed indicating the appropriate
results of a limit test.
“Noise” will be displayed if there is excessive background
noise measured. The measurement may not be accurate. See
troubleshooting if this condition is persistent.
Out of Range Values
When entering numeric data, it is possible to enter a value
out of range. Depending on the function, the Antenna Tester
will either enter the minimum or maximum value, or the
cursor will continue to blink on the function out of range
waiting for the correct entry.
Setting the Auto Shut-Off Timer
In order to preserve battery life, the Antenna Tester will
automatically shut off after 5,15,30 or 60 minutes without
any keystrokes.
Follow the steps below to select the length of time, before
auto shut-off occurs.
y
Press the
MENU
key.
y
Press the
UTIL
key.
y
Press the
TIMER
key until the desired interval is
displayed.