April 2004
9-40 Servicing the PT878GC
Setting Impulse Response (cont.)
2. The second prompt asks for the percent of gain.
a. Press [ENTER] to open the text box.
b. Use the numeric keys to enter the desired percentage.
c. Press [ENTER] to confirm your entry.
You have completed entering data for the Impulse Response
option.
•Press [F1] to start transmitting in the chosen direction.
•Press [F2] to stop transmitting.
•Press [F3] to leave the option and return to Operate Mode.
Taking Wave Samples for Diagnosis
The Wave Snapshot option allows you to capture receive signals
to a file that you can send to a PC for diag nostic purpo ses. To use
this option, scroll down to the Wave Snapshot entry in the
Service Menu and press [ENTER]. The PT878GC then captures
three pairs of upstream and downstream raw signals to a file
named Wave01.met. (If you repeat the captures, the successive
files will be named Wave02.met, Wave03.met, etc.) You can then
transfer the files over the IR port to a PC for analysis by a service
engineer.
Note: Refer to page 6-16 for information on transferring a file
to a PC.
Applying a Stored Signal for Diagnosis
The Simulate option places the PT878GC in a mode in which it
uses a stored signal (instead of the live signal from the
transducers) to make flow calculations for diagnostic purposes.
On the PC, you must rename a Wavexx.met file as Wave.met and
send it back to the PT 878GC over the IR link. Then, on the
PT878GC, scroll down to the Simulate entry in the Service Menu
and press [ENTER]. The PT878GC then applies the simulated
signal.
Note: Refer to page 6-17 for information on transferring a file
from a PC to the PT878GC.