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The SR625 Frequency Counter is a NIST traceable frequency counting
standard for calibarating base stations, transmitters and many other
types of communication systems. It combines the high resolution
and wide variety of features found in the SR620
counter with the atomic accuracy of a rubidium timebase.
Low Drift, High Accuracy
The SR625 Frequency Counter consists of a frequency counter (SR620),
a high-accuracy rubidium timebase (PRS10), and a 2 GHz input prescaler.
The combination of the SR620 and the prescaler allows direct frequency
measurements up to 2 GHz with twelve digits of resolution in a 100
s measurement. The rubidium timebase ensures excellent short-term
stablity (<2 × 10-11 Allan
variance (1 s)) and long-term drift (<5 × 10-11/month).
Simple, Portable Operation
The SR625's warmup time is less than ten minutes making it ideal
for field applications. An additional back-panel output provides
a rubidium stablized 10 MHz signal which can be used to drive other
test equipment (e.g., synthesizers or spectrum analyzers). The standard
GPIB and RS-232 interfaces allow for complete control and data acquisition
from any laboratory computer. The SR625's performance makes it the
standard for remote applications or laboratory calibration.
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