Frequency Standards FS752 — GNSS Time and Frequency Reference FS752 GPS Time & Frequency Reference · GPS/GNSS disciplined 10 MHz · Double-oven OCXO timebase · Low phase noise · Five 10 MHz outputs · Two 1 pps outputs · Up to eight additional 10 MHz & 1 pps outputs (opt.) The FS752 GNSS Disciplined Time and Frequency Reference provides calibrated time and frequency distribution to your laboratory. A built-in receiver tracks any of the four major GNSS constellations: GPS, GLONASS, BEIDOU, or GALILEO. The instrument comes with a double-oven OCXO timebase that has phase noise of less than -125 dBc/Hz at 10 Hz offset. 10 MHz and 1 pps Distribution The FS752 provides five buffered 10 MHz outputs and two buffered 1 PPS outputs. The 10 MHz outputs generate 1 Vrms into Stanford Research Systems

FS752 Time and Frequency Reference 50 Ω and may be used as frequency references for laboratory equipment. The 1 p p s o u tp u ts g e n era te 1 0 µs pulses, with 5 V CMOS logic and rising edges aligned to UTC. Up to eight additional 10 MHz and 1 pps outputs are available as rear-panel options. for the receiver’s sawtooth error, then phase locks the timebase to the GNSS 1 pps. The TDEV between two instruments is a few nanoseconds. If the GNSS signal is lost, the timebase is left at the last locked frequency value. The timebase will age or drift in frequency by less than ±0.05 ppm/year. GNSS Antennas...

OCXO Timebase Oscillator type Temp. Stability Aging Phase noise (SSB) Stability Holdover GPS Receiver Model Satelite acq. time Almanac acq. time Optimized for static applications Accuracy of UTC Time wander Antenna delay correction range 1 pps Output Period Width Phase accuracy Jitter Level Transition time Source impedance Reverse protection Double oven controlled, 3rd OT, SC-cut crystal <2 x 10-9 (20 to 30 °C) <0.2 ppm/year (undisciplined to GPS) <-125 dBc/Hz (typical) See graphs next page <40 ps / 24 hr. u-blox, NEO-M8T Less than 1 minute (typ.) Approximately 15 minutes when continuously tracking...