Lambda SR1, Operation Manual, Page: 287 / 317

SR1 Operation 287
© 2014 Stanford Research Systems
2.9.5 Digital IO
The Digital-IO selection provides 3 measurement setups dealing with jitter measurement.
What you'll need to configure for all these setups:
Change the digital input and output settings (connector, OSR, bit resolution) to match the equipment
being tested,
Jitter Chirp
This measurment uses a jitter "chirp" to measure the jitter transfer function of the equipment being
tested. A jitter chirp is a waveform synchronized to the jitter analyzer that contains equal amounts of
jitter in each frequency bin. When used as the input to a DUT, the output jitter spectrum is proportional
to the jitter transfer function of the DUT. The A0 analyzer is setup as a frequency domain jitter analyzer.
Pages 2 and 3 contain the frequency domain and time domain jitter results.
What you'll need to configure:
Adjust the amplitude of the jitter chirp on the Digital IO Panel .
Jitter Sweep
This setup measures jitter amplitude vs. frequency using a sweep. The frequency of a jitter sine is swept
from 20 Hz to 100 kHz and the resulting jitter output from the DUT is recorded on Page2.
What you'll need to configure:
Adjust the the sine amplitude to match the equipment being tested. The number of points in the sweep
can be changed to give faster sweeps or higher resolution sweeps. The settling parameters can be
adjusted to fit the noise levels of the signals being measured.
Jitter
Measures both RMS Jitter and the Jitter spectrum with SR1's jitter generator off. This setup is used to
measure the intrinsic jitter output from a DUT. A0 is setup as a time domain jitter analyzer to measure
rms jitter while A1 is setup to measure the jitter frequency spectrum.
What you'll need to configure:
The default frequency and amplitude of the digital sine is 1 kHz, 1FFS. This should be adjusted as
needed.