Stanford FS700 LORAN-C Frequency Standard

serves as a NIST traceable frequency reference

Distributed only in Germany
This is a discontinued product
More Information? Please contact us.
  • Overview

Key Facts

Many complex electronic systems require a stable, highly accurate timebase. Communication, automatic test and measurement, and precision time-measurement systems all require accurate frequency standards.

The SR630 is a 16-channel thermocouple monitor designed to read, scan, print and log temperatures or voltages. You can use any one of seven standard thermocouple types to read temperatures from -200 °C to +1700 °C.

Features

  • 10-12 long-term stability
  • NIST traceable
  • 10-10 short term stability (Optional 10-11)
  • Four 10 MHz reference outputs

Specifications

The FS700 LORAN-C Frequency Standard produces a highly stable and accurate 10 MHz output by locking its oven stabilized crystal oscillator to LORAN-C radio transmissions.

Key Facts

Many complex electronic systems require a stable, highly accurate timebase. Communication, automatic test and measurement, and precision time-measurement systems all require accurate frequency standards. Traditionally, users have looked to atomic clocks (cesium or rubidium) for high stability and accuracy. With the FS700 LORAN-C Frequency Standard, cesium-clock stability is now available at a fraction of the cost of atomic standards. The FS700 serves as a NIST traceable frequency reference in the US, Europe and Asia.

Sales Region only Germany

For Stanford power supplies please see PS310, PS325, PS350.

Features & Benefits

  • 10-12 long-term stability
  • NIST traceable
  • 10-10 short term stability (Optional 10-11)
  • Four 10 MHz reference outputs
  • Guaranteed reception throughout
  • Most of the northern hemisphere
  • Phase detector with stripchart output
  • Hz to 10 MHz TTL output

Specifications

Overview

The FS700 LORAN-C Frequency Standard produces a highly stable and accurate 10 MHz output by locking its oven stabilized crystal oscillator to LORAN-C radio transmissions. The FS700 system consists of a receiver containing amplifiers, filters, data acquisition circuitry, and a remote antenna. The long term stability of the FS700 is that of the transmitted standard, an atomic cesium source. An internal phase meter circuit allows for the precise frequency calibration of external oscillators. An optional distribution amplifier provides multiple outputs of the 10 MHz reference.

´
Receiver
Sensitivity Will lock with signal-to-atmospheric noise level of -10 dB or better
LORAN output Filtered and gain controlled antenna signal, typically 6 Vpp
Station search All available stations pre-programmed, Auto-Seek finds and tracks strongest station
Notch filters 6 adjustable -30 dB notch filters, 3 at 40 to 90 kHz, 3 at 110 to 220 kHz
Frequency
Frequency stability
Long term 10-12, the same as LORAN-C transmitter cesium clock.
Short term 10-10 (standard oscillator), 10-11 (low phase noise option)
Outputs Four 10 MHz outputs, 1 Vpp sine into 50 W
LOCK output Rear panel TTL indicates receiver lock.
Front panel output TTL level output from 0.01 Hz to 10 MHz in a 1, 2.5, 5 sequence.
Internal Oscillator
Standard Option 01
Frequency 10.000 MHz 10.000 MHz
Type AT Cut Ovenized SC Cut Ovenized
Aging 5x10-10/day 5x10-10/day
Allan variance (1s) 5x10-11 5x10-12
Stability 0-50° C 0.005 ppm 0.005 ppm
Phase noise -125 dBc @ 10 Hz
-130 dBc @ 100 Hz -155 dBc @ 100 Hz
-165 dBc @ 1 kHz
Phase Meter
Frequency output 0.01 Hz to 10 MHz in 1, 2.5, 5 sequence, TTL level.
Can be 50 W terminated.
Oscillator input 1 kW, 0.5 Vpk min, 5.0 V max.
Phase output 0.01 V/degree, 0 to ± 360 °. Output proportional to phase difference between OSC IN and FREQUENCY OUTPUT for frequencies between 100 kHz and 10 MHz
Computer Interface
GPIB IEEE-488 compatible interface. All instrument functions may be controlled. GPIB interface is standard.
RS-232 Optional 300 to 19,200 baud DCE serial interface. All instrument functions may be controlled.
Antenna
Type 100 kHz active antenna, with 40 kHz bandwidth bandpass filter in base.
Height 102"
Material Fiberglass Whip
Base 2" dia. x 7.5", PVC
Mounting 3/4" FIPT
Output 50 W nominal, female BNC
Environmental -40 to 60 °C, 0 to 100 % RH
Lightning Protection Module
Surge 18,000 A IEEE 8/20 waveform (based on ANSI C62.1)
Frequency range DC to 30 MHz
Throughput energy <16 mJ (based on 1 KV/nS waveform)
Insertion loss <0.25 dB
General
Operating 0 to 50 °C
Power 100/120/220/240 VAC (+5%, -10%), 50/60 Hz, 50 W
Dimensions 17 " x 17 " x 3.5 ". Rack mounting hardware included.
Weight 14 lbs
WarrantyOne year parts and labor on any defects in material or workmanship
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