SR255 Fast Sampler0 pages

Gated Integrators and Boxcar Averagers
Model SR255 — 100 ps gated integrator

· Gates of 100 ps, 200 ps, 500 ps & 1 ns
· Jitter <2 ps rms
· Droopless analog output
· Linear over full range
· 20 ns insertion delay
· Trigger rates to 50 kHz

· SR255 ... $2990 (U.S. list)

SR255 Fast Sampler
The SR255 Fast Sampler module is a gated integrator with
four discrete user-selected gate widths from 100 ps to 1 ns.
All of the necessary electronics are built into this high-speed
module including an A/D, D/A and a PROM correction
circuit to eliminate the inherent non-linearities in the sampling
bridge.
The SR255 is perfect for fast pulsed experiments where the
2 ns minimum gate width of the SR250 is insufficient. The
gate delay is controlled by a rear-panel voltage input which
can be supplied by the SR200 Gate Scanner or the SR245
Computer Interface. Convenient gate view and signal outputs
allow precise positioning of the gate—particularly important
in applications such as time domain reflectometry or shortedcable baseline subtraction. The SR255 can be used alone,
combined with the SR245 Computer Interface module for
automated data acquisition, or operated with the SR200 Gate
Scanner for scanning gate waveform recovery.

Stanford Research Systemst
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Triggering
The SR255 has a DC-coupled trigger input (50 Ω) that
supports trigger rates up to 50 kHz. The trigger threshold
can be set to –0.5 V, +0.1 V or +1 V on the front panel. For
reliable triggering, the trigger must remain over threshold for
at least 5 ns and not exceed 5 V.
Gate Delay
The delay from trigger to sample is controlled by an analog
voltage applied at the rear of the unit. You can select delay
ranges of 1, 10, 100 or 1000 ns/V with four switches accessed
through the instrument’s side panel. In addition to the
adjustable delay, there is a fixed insertion delay of about 20
ns. With only 2 ps rms gate jitter, the SR255 makes it easy to
set up and maintain precise gate timing.

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