Time and Frequency Standard by SRS

Note : Your request will be directed to SRS.

FS740 Image

The FS740 from Stanford Research Systems is a GPS/GNSS Time and Frequency Standard that provides a 10 MHz frequency reference. It has long-term frequency stability of 1 × 10-13, short-term frequency stability of 1 × 10-9, and phase noise of less than -100 dBc/Hz at 10 Hz offset. The instrument has a built-in receiver that can track GPS, GLONASS, BEIDOU, or GALILEO constellations. It can also time tag external events with respect to UTC or GPS and measure the frequency of user inputs. It provides DDS synthesized frequency output, adjustable-rate (and width) pulse output, and an AUX output for arbitrary waveforms including an IRIG-B timecode output.

The FS740 has an optional OCXO that provides short-term frequency stability of 1 × 10-11 with a phase noise of less than -130 dBc/Hz at 10 Hz offset. It also has an optional rubidium timebase that provides short-term frequency stability of 1 × 10-12 with a phase noise of less than -130 dBc/Hz at 10 Hz offset.

The FS740 has a screen at the front with a graphical user interface that allows users to configure the instrument and see the results of time and frequency measurements. It is available in an enclosure that measures 8.5 × 3.5 × 13.0 inches and has ethernet/USB control interfaces. The instrument requires an AC supply of 90-264 V, 47-63 Hz with PFC, and consumes 90 W of power.

Product Specifications

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Product Details

  • Part Number
  • Manufacturer
  • Description
    10 MHz GPS/GNSS-Disciplined Time and Frequency Standard

General Parameters

  • Type
    Time & Frequency Standard
  • Oscillator Type
    Rubidium, TCXO, OCXO
  • Frequency
    1 to 10 MHz
  • Stability over Temperature
    2 ppm(TCXO), 2 ppb(OCXO), 0.2 ppb(Rubidium)
  • Frequency Aging
    5 ppm. 0.2 ppm, 0.0005 ppm
  • Output Waveform
  • Acquisition Time
    1 minute
  • Impedance
    50 Ohms
  • Harmonics
    -40 dBc
  • Spurious
    -70 dB
  • AC Supply
    90 to 264 VAC
  • DC Supply
    5 V
  • Package Type
    Rack mount
  • Connectors
  • Interface
    RS-232, Ethernet, 10/100 Base-T. TCP/IP & DHCP RS-232
  • Front Panel Display
  • Weight
    10 lbs.
  • Dimensions
    8.5” × 3.5” × 13” (WHL)

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