Note: Both the 'Generator - Video Standard' pane and the ‘Generator – Status’ instrument indicate
when a PRBS signal is being generated.
Note: PRBS signal analysis is available in the ‘PRBS – Analysis’ instrument window.
Jitter Insertion
Jitter can be inserted into any generated SDI signal in order to stress the interface and ensure that
receivers are compliant to SMPTE recommended practice. Sinusoidal jitter can be inserted with a
frequency ranging from 10Hz to 10MHz. Peak-to-peak jitter amplitude can be adjusted.
Enable jitter insertion:
l Advanced Generation Tools (BNC) > Jitter Insertion Mode > [Disabled, Sine]
Enabling jitter insertion reveals a setting for specifying the frequency of the jitter wave:
l Advanced Generation Tools (BNC) > Jitter Insertion Mode > Frequency > [1.0Hz to 10.0MHz]
Note: For precision setting adjustment and frequencies below 10Hz use the up/down arrow buttons or input
values via a USB keyboard.
Peak-to-peak jitter amplitude can be adjusted, with jitter amplitude measured in terms of signal Eye
Unit interval (UI):
l Advanced Generation Tools (BNC) > Jitter Insertion Mode > Amplitude P-P > [slider, 0.01 to 110.00 UI,
dependent on frequency]
WARNING: In this software release, SDI outputs B, C and D may be corrupted when jitter is inserted.
Note: Jitter can be observed in the ‘Eye – SDI In A’ and ‘Jitter – SDI In A’ instrument windows. For analysis,
apply filters and other settings in the Eye and Jitter instruments as required. (See ‘Eye – SDI In A’ and ‘Jitter –
SDI In A’ sections of this manual for information on analysis.)
Driver & Output Control
The signal amplitude of ‘SDI Out A’ can be increased or decreased by up to 10%:
l Advanced Generation Tools (BNC) > Driver A Amplitude Offset > [+/- 0, 2, 4, 6, 8, 10%]
Note: Qx units released prior to software release 2.3 will first require Driver A calibration. For instructions on
driver calibration, see 'Driver Calibration' section of this manual.
The ability to mute any of the SDI outputs is also provided:
l Advanced Generation Tools (BNC) > Mute SDI Output A > [Enabled, Disabled]
l Advanced Generation Tools (BNC) > Mute SDI Output B > [Enabled, Disabled]
l Advanced Generation Tools (BNC) > Mute SDI Output C > [Enabled, Disabled]
l Advanced Generation Tools (BNC) > Mute SDI Output D > [Enabled, Disabled]
For SDI Out A, driver pre-emphasis can be adjusted to boost the signal at the beginning of the rising edge of
the eye pattern to optimize signal integrity. (See 'Eye - SDI In A' instrument for eye pattern display.)
l Advanced Generation Tools (BNC) > Driver Pre-Emphasis > [Disabled, 0.5 dB, 1.0 dB, 1.5 dB]
With Driver Pre-Emphasis enabled, the pre-emphasis time constant can be left as default, or changed -
divided by 2, 4, or 8 - to adjust how long the signal is boosted for:
l Advanced Generation Tools (BNC) > Driver Pre-Emphasis > Time-Constant > [Default, Div 2, Div 4, Div
8]
PHABRIX Qx User Manual Page 19
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