3 VMA Mode
3.1 Digital Demod Measurement
:DDEM:SYNC:SWOR:OFFS?
Couplings Max and min constrained by Search Length, Sync Pattern length
Preset 0
State Saved Yes
Min -32768
Max 32767
Sync Pattern
Enables you to define a bit pattern for the sync word search. The maximum length of
the pattern is 32 symbols. When you press this control, an editor dialogappears that
enables you to define the pattern in binary or hexadecimal.
The instrument can only search for search patterns that are a multiple of the number
of bits-per-symbol. The instrument assembles the bits in the search pattern into an
integer number of symbols, ignoring any trailing bits that cannot complete a full
symbol.
For example, if the number of bits-per-symbol is 4 (as with 16 QAM), and your
search pattern contains 18 bits, the instrument only uses the first 16 bits during sync
search and ignores the last two bits.
Although the underlying sync pattern is binary, the editor enables you to enter bit
patterns in either binary or hexadecimal.
Hexadecimal entries are in symbol table hex format. In this format, each symbol is
represented by 1 to 3 hex digits. The least significant bits make up the symbol and
any extra bits are ignored. Thus, for 6 bits per symbol, the binary value of 101101 is
encoded in hex as 2D. If you enter AD as the symbol value, it is converted to the
same binary value as 2D because the upper 2 bits are ignored. 3-bit-wide symbols
are represented by 1 hex digit with the most significant bit ignored.
Remote
Command
[:SENSe]:DDEMod:SYNC:SWORd:PATTern <string>
[:SENSe]:DDEMod:SYNC:SWORd:PATTern?
Example
:DDEM:SYNC:SWOR:PATT '1011010'
Set the sync pattern to '1011010'
:DDEM:SYNC:SWOR:PATT?
Notes <string> must be a string of 1s and 0s only. The maximum string length is 320 bits. Any string that
violates these requirements will return error -224 "Illegal parameter value"
State Saved Yes
3.1.9.5 Meas Time
Enables you to set measurement time parameters.
333 Vector Modulation Analyzer Mode User's &Programmer's Reference
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