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Performance Verification
4–50
AM700 Audio Measurement Set Service Manual
Check the DSP Port
The following procedure checks that the DSP port functions to provide direct
input and output of digital signals to and from the DSP.
1. Connect a DSP PORT test cable on the rear panel from the test AM700 to
DUT.
2. On a PC, use Edit to make a file called dport.on" which contains the
following command line to switch the DSP to the transmit mode:
scpi INT: SOUR:DSP:TMODE on
NOTE. This has to be an ASCII text file, so use EDIT instead of a word processor
that may add formatting or control characters. You can also use a Windows tool
such as Note Pad to write this file. There is no front panel control to make this
switch.
3. Save the file to a 3.5 inch floppy disk labeled “dtest” and remove it from the
PC disk drive.
4. Insert the 3.5 inch floppy disk labeled “dtest” into the the test AM700.
5. Setup the the test AM700 using the following procedure:
a. Press the Storage button, and touch the left Drive soft key to switch to
dos. (This should display the files in the floppy disk.)
b. If not already done, touch the right Drive soft key to select nvram.
c. Touch function/ (on the right side); then touch Change Directory.
d. In the DOS directory list, touch the dport.on file name.
e. Press the Copy soft key, then OK. Wait for about 1 second, and then
press the Clear Menu button.
f. Press the GENERATOR Control button, touch the AES soft key in the
menu, and then press the Clear Menu button.
g. Press the Function button, and select the dport.on function name.
h. Touch the Run Function soft key, and wait for 1 sec.
i. Select the FFT application.
DSP Port Test