Tektronix SPG8000A, User Manual

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138 SPG8000A User Manual
instrument in a 25 °C room, the power supply is specified to last at least 15
years (131,400 hours). For a lightly loaded instrument with only one or two
modules running a 25 °C, the power supply should last 20 years (175,000
hours).
At the maximum room temperature, the expected life of the power supply
is significantly less. For example, for a fully loaded instrument operating at
50 °C room temperature, the expected life of the power supply is 5 years
(43,800 hours). The temperature - weighted hours (TWH) accounts for
variations in the operating environment and displays a number normalized
to 25 °C operation. Therefore, if the TWH is near the 131,400
recommended limit, then you should consider replacing the supply.
If a power supply module is not installed, PS<1 or 2> not installed is
displayed for that power supply.
•
Mfg. Date : These readouts display the manufacturing date of each installed
power supply module. The readouts include the time (HH:MM:SS) and the
date (day, month, year). If a power supply module is not installed, PS<1 or
2> not installed is displayed for that module.
•
Part No : These readouts display the Telestream part number of each
installed power supply module. If a power supply module is not installed,
this readout displays 0 for that power supply. This readout is not available
from the instrument front panel.
•
Load Test History : These readouts display a brief history of the load test
for each installed power supply module. The readouts include the status of
the previous load test for each installed power supply module (when the
module was configured to be the backup (standby) supply), the number of
times the module has passed or failed the test, and the date (year, month,
day) and time (HH:MM:SS) of the last test. If a power supply module is
not installed, PS<1 or 2> not installed is displayed for that power supply.
•
Backup Test: The instrument must have two power supply modules
installed (Option DPW) and connected to power to run this load test. The
load test checks that the power supply module that is configured as the
backup supply is operational and ready to be configured as the primary
(preferred) supply.
M anually perform the backup test: select Run . While the instrument is in
operation, this test is automatically performed one time every 24 hours.
The example diagnostic display above shows the readout with a load test
in progress.
Note: If you have only one power supply installed that is connected to power, an error
message will appear if you attempt to run this test.
If you attempt to run the load test immediately after changing the preferred supply
configuration or if you rerun the test immediately after running the test a first time, an
error message may appear stating that the load must cool down before the test can be
run. The error message includes an estimate of the time needed for the load to cool
down before you can run the test. An example message in this situation is “Error:
cooldown, 1 min 40 sec left.”