:CHANnel:SCRecovery:PLLoop:ORDer

Instrument:

UXR Scope

Meas. mode:

Scope

Eye

Flex Apps:

FlexDCA

FlexRT

Command Syntax

:CHANnel{1:8}{A|B|C|D}:SCRecovery:PLLoop:ORDer {FIRSt | SECond | THIRd}

Where the required specifier {1:8}{A|B|C|D} identifies a channel by its module slot number and channel letter. For example, channel 3C (CHANnel3C).

The channel specifier will fail if it does not include a slot number. If instead the suffix's channel letter is missing, the command defaults to letter A. As a result, the best practice is to always explicitly specify the channel by including both the module slot number and channel letter.

Query Syntax

:CHANnel{1:8}{A|B|C|D}:SCRecovery:PLLoop:ORDer?

Query Response

{FIRS | SEC | THIR}

Description

For the selected channel's software clock recovery, selects a first, second, or third order low-pass filter for the FlexRT software clock recovery's phase lock loop. The following arguments are used:

FIRSt: Selects a first-order loop. Use the :CHANnel:SCRecovery:PLLoop:MODE command to define either the Jitter Transfer Function (JTF) or Observed Jitter Transfer Function (OJTF) type of PLL. The transfer functions are defined using the :CHANnel:SCRecovery:PLLoop:JTF:BANDwidth and :CHANnel:SCRecovery:PLLoop:OJTF:BANDwidth commands.
SECond: Selects a second-order loop. This is the default selection. Use the :CHANnel:SCRecovery:PLLoop:MODE command to define either the Jitter Transfer Function (JTF) or Observed Jitter Transfer Function (OJTF) type of PLL. The JTF is defined using the :CHANnel:SCRecovery:PLLoop:JTF:BANDwidth and :CHANnel:SCRecovery:PLLoop:JTF:PEAKing commands. The OJTF is defined using the :CHANnel:SCRecovery:PLLoop:OJTF:BANDwidth and :CHANnel:SCRecovery:PLLoop:OJTF:DFACtor commands.
THIRd: Selects a third-order loop. Use the :CHANnel:SCRecovery:PLLoop:FGAIn command to enter the frequency for the loop's gain. Use the :CHANnel:SCRecovery:PLLoop:FPOLe command to enter the frequency for the loop's pole. Use the :CHANnel:SCRecovery:PLLoop:FZERo command to enter the frequency for the loop's zero.

Before this command can take effect, you must disable shared acquisition parameters with the :CHANnel:RTSCope:TRACkcommand.

Requires FlexDCA revision A.06.70 and above.

Example Command

:CHANnel2A:SCRecovery:PLLoop:ORDer FIRSt