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340 Agilent N518xA, E8663B, E44x8C, and E82x7D Signal Generators Programming Guide
Creating and Downloading User-Data Files
Data Transfer Troubleshooting (N5182A, E4438C and E8267D Only)
Data Transfer Troubleshooting (N5182A, E4438C and E8267D Only)
NOTE The section, User FIR Filter Coefficient File Download Problems, applies to the N5182A with
Option 651, 652, or 654; the E4438C with Option 001, 002, 601, or 602; and the E8267D with
Option 601 or 602.
The remaining sections, User File Download Problems and PRAM Download Problems, apply
only to the E4438C with Option 001, 002, 601, or 602; and the E8267D with Option 601 or
602.
This section is divided by the following data transfer methods:
“User File Download Problems” on page 340
“PRAM Download Problems” on page 341
“User FIR Filter Coefficient File Download Problems” on page 343
Each section contains the following troubleshooting information:
• a list of symptoms and possible causes of typical problems encountered while downloading data
to the signal generator
• reminders regarding special considerations and file requirements
• tips on creating data, transferring data, data application and memory usage
User File Download Problems
Data Requirements
• The user file selected must entirely fill the data field of each timeslot.
• The user file must be a multiple of 8 bits, so that it can be represented in ASCII characters.
• Available volatile memory must be large enough to support both the data field bits and the
framing bits.
Table 8-12 Use-File Download Trouble - Symptoms and Causes
Symptom Possible Cause
At the RF output,
some data modulated,
some data missing
Data does not completely fill an integer number of timeslots.
If a user file fills the data fields of more than one timeslot in a continuously repeating framed
transmission, the user file will be restarted after the last timeslot containing completely filled
data fields. For example, if the user file contains enough data to fill the data fields of 3.5
timeslots, firmware will load 3 timeslots with data and restart the user file after the third
timeslot. The last 0.5 timeslot worth of data will never be modulated.