LeCroy DDA 7 Zi series, Operator'S Manual

Page: 499 / 544

Operator's Manual
WP700Zi-OM-E-RevA
498
user definition is successfully loaded, a confirming message is displayed. The message disappears after
approximately 10 seconds.
Loading Your UDT File Remotely
To call the UDT file when operating the instrument remotely, use remote command
DD_LOAD_UDF "filename"
where:
filename = full qualified path to the UDT file, for example, "C:\Lecroy\myudf"
General Rules and Error Messages
All lexical elements should be separated by white space. Lexical elements include keywords and their arguments.
White space includes space, tab, carriage return, and line feed. One exception: the double slash //, which starts a
comment, need not be followed by white space.
As the file is parsed, if the expected number of arguments for a keyword is not available, the error message
"Could not read args for '<keyword>..! abort" will be displayed and the parse is canceled. If the word where we
expect a keyword is not recognized as a keyword, the error message "Word starting '<text>': not a keyword!
Abort" is displayed and the parse is canceled. Possible causes for this are comment text without a preceding //, or
too many arguments for the preceding keyword.
When the end of the file is reached, the DDA verifies that all required keywords were seen in the file. If not, the
message "Missing <number> required keywords!" is displayed and the parse is considered canceled. Not all
keywords are required; however, we strongly encourage you to use them all, in every file. The result of omitting
most optional keywords is to leave previously set values unchanged.
Keywords
keyword: //
arguments: none
required?:
no
Notes:
1. // begins a comment. After // the rest of the line, up to line feed, is ignored.
2. // need not be followed by a space.
keyword: AGC_GAIN
arguments: <value, 0 to 0.125>
required?:
no
Notes:
The difference of the normalized (-1 to +1) sample value to the expected sample value is
multiplied by this to determine the change in expected level. The DDA treats positive and
negative levels separately, to handle asymmetric waveforms. The change in the 0 level is
1/4 of this, a correction to the 0 level shifts all the levels. The DDA also allows very slow
changes of relative spacing; it starts analyzing each VCO sync field assuming symmetry
and perfect spacing. In the DDA, this value is 0.12 for PR4, EPR4, and E2PR4. If this
keyword is not seen, its value remains unchanged. If this value is never set, the default is
0.12.
possible error
messages:
"AGC_GAIN must be >= 0 and <= 0.125"