Agilent Technologies Agilent 33500 Series Operating And Service Manual page 219

FUNCtion Subsystem
[SOURce[1|2]:]FUNCtion:PRBS:DATA < sequence_type >
[SOURce[1|2]:]FUNCtion:PRBS:DATA?
Sets the pseudo-random binary sequence (PRBS) type. Setting the sequence type sets the length and feedback values
as shown below.
{PN7|PN9|PN11|PN15|PN20|PN23}
Value after PN corresponds to maximum shift register length in bits.
Default is PN7.
Set data format to PN23:
FUNC:PRBS:DATA PN23
SYNC Output may be active during a PRBS function, unlike the
l
A PRBS waveform using polynomial PNx is generated by a shift register of x bits, and the output waveform begins
l
with x sample periods of high output. Sample period is the reciprocal of the sample rate (FUNCtion:PRBS:BRATe),
and the channel's Sync pulse indicates the waveform's start. For example, if the PRBS uses PN23 with sample
rate 500 Hz, the output begins with 46 ms of high output (23 x 2 ms). The polynomials are shown below.
Sequence Type Polynomial
7
PN7 x + x
9
PN9 x + x
11
PN11 x
15
PN15 x
20
PN20 x
23
PN23 x
[SOURce[1|2]:]FUNCtion:PRBS:TRANsition[:BOTH] {< seconds >|MI-
Nimum|MAXimum}
[SOURce[1|2]:]FUNCtion:PRBS:TRANsition[:BOTH]? [{MINimum|MAXimum}]
Sets PRBS transition edge time on both edges of a PRBS transition.
Parameter
8.4 ns (default) to 1 μsec, limited as described below
Set edge time to 10 ns for the leading and trailing edges (two methods):
FUNC:PRBS:TRAN 10 ns
FUNC:PRBS:TRAN .000000010
218
Parameter
Feedback
6
+ 1 0x02000000
5
+ 1 0x04000000
9
+ x + 1 0x00400000
14
+ x + 1 0x00020000
17
+ x + 1 0x00004000
18
+ x + 1 0x00002000
PN7, PN9, PN11, PN15, PN20, or PN23
NOISe function.
Length
7
9
11
15
20
23
Typical Return
+1.000000000000000E-08
Agilent 33500 Series Operating and Service Guide
Typical Return