Time Interval and Frequency Counter0 pages

Frequency Counters
SR620 — Universal time interval and frequency counter

SR620 Time Interval & Frequency Counter
· 25 ps single-shot time resolution
· 1.3 GHz frequency range
· 11-digit frequency resolution (1 s)
· 0.001° phase resolution
· Statistical analysis & Allan variance
· Graphical output to X-Y scopes
· Hardcopy to printers and plotters
· GPIB and RS-232 interfaces
· Optional ovenized timebase

The SR620 Time Interval Counter performs virtually all of
the time and frequency measurements required in a laboratory
or ATE environment. The instrument’s single-shot timing
resolution and low jitter make it the counter of choice for
almost any application.
SR620 Measurements
The SR620 measures time interval, frequency, pulse-width,
rise and fall time, period, phase and events. Time intervals
are measured with 25 ps rms resolution, making the SR620
one of the highest resolution counters available. Frequency
is measured from 0.001 Hz to 1.3 GHz, and a choice of gates
ranging from 1 period to 500 seconds is provided. The SR620
delivers up to 11 digits of frequency resolution in one second,
making it suitable for measurement applications ranging from
short-term phase locked loop jitter, to the long-term drift of
atomic clocks. All measurement modes are supported by a
wide variety of flexible arming and triggering options.
Histograms and Strip Charts

· SR620 ... $4950 (U.S. list)

Unlike conventional counters that only have numeric displays,
the SR620 provides live, graphical displays of measurement
results. Graphical data is available in three formats: a
histogram showing the distribution of values within a set of
measurements, a strip chart of mean values from successive
measurements, or a strip chart of jitter (standard deviation or
Allan variance) values from successive measurements. Up
to 250 strip-chart points or histogram bins can be displayed.

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