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home > Stanford Research Systems FS725 Rubidium Frequency Standard (Pre-Owned) > Stanford Research Systems FS725 Rubidium Frequency Standard (Pre-Owned)

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Stanford Research Systems FS725 Rubidium Frequency Standard (Pre-Owned)Stanford Research Systems FS725 Rubidium Frequency Standard (Pre Owned) Key Features At A Glance Two 10 MHz and one 5 MHz 50 sine outputs plus a 1 pps output, all with ultra low phase noise Phase noise <130 dBc Hz at 10 Hz offset; one second Allan variance <2 10 20 year aging of 5 10 (typ.) with rubidium oscillator MTBF over 200,000 hours 1 pps input and output for GPS synchronization, delivering Stratum 1 performance RS 232 computer interface with

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Stanford Research Systems FS725 Rubidium Frequency Standard (Pre-Owned)

Name: Stanford Research Systems FS725 Rubidium Frequency Standard (Pre-Owned)
Brand: terrelite.it
SKU: 33716722266
Price: 2096.47 USD
Availability: InStock
Rating: 4.1818 (457 reviews)

Key Features At A Glance

Two 10 MHz and one 5 MHz 50 Ω sine outputs plus a 1 pps output, all with ultra-low phase noise
Phase noise <−130 dBc/Hz at 10 Hz offset; one-second Allan variance <2 × 10⁻¹¹
20-year aging of 5 × 10⁻⁹ (typ.) with rubidium oscillator MTBF over 200,000 hours
1 pps input and output for GPS synchronization, delivering Stratum 1 performance
RS-232 computer interface with provided Windows RbMon software for monitoring and control
Built-in distribution amplifiers expandable to 22 outputs via up to three option boards
Two SPDT status alarm relays for rubidium lock state and 1 pps synchronization
Compact half-width 2U chassis integrating the rubidium oscillator and low-noise AC supply

The Stanford Research Systems FS725 is a benchtop rubidium frequency standard that integrates a rubidium oscillator (SRS model PRS10), a low-noise AC power supply, and distribution amplifiers in a compact, half-width 2U chassis. It is built for stable, reliable long-term operation, with an estimated 20-year aging of less than 5 × 10⁻⁹ and a demonstrated rubidium oscillator MTBF of over 200,000 hours.

The FS725 is an ideal instrument for calibration and R&D laboratories, or any application requiring a precision frequency standard. It can be phase-locked to an external 1 pps reference such as GPS, providing Stratum 1 performance, making it suited to timing and synchronization tasks that demand a disciplined, traceable frequency source.

Every FS725 we offer is held in ValueTronics' own 20,000 square-foot secure warehouse at 1675 Cambridge Drive in Elgin, Illinois, where we stock and own the inventory we sell. Each pre-owned unit is inspected and functionally verified in-house by our technicians before it ships, while new units leave factory-sealed exactly as received from the manufacturer.

Accessories Supplied

Windows RbMon control/monitor software

Product Core & Specifications

Specification	Value
Output
Output frequencies	10 MHz sine, 5 MHz sine, 10 µs wide 1 pps pulse
Amplitude	0.5 Vrms, ±10 %
1 pps pulse amplitude	2.5 V into 50 Ω, 5 V into High-Z loads
Phase noise (SSB)	<−130 dBc/Hz (10 Hz), <−140 dBc/Hz (100 Hz), <−150 dBc/Hz (1 kHz), <−155 dBc/Hz (10 kHz)
Spurious	<−100 dBc (100 kHz BW)
Harmonics	<−60 dBc
Accuracy at shipment	±5 × 10⁻¹¹
Aging (after 30 days)	<5 × 10⁻¹¹ (monthly), <5 × 10⁻¹⁰ (yearly), 5 × 10⁻⁹ (20 years, typ.)
Short-term stability (Allan variance)	<2 × 10⁻¹¹ (1 s), <1 × 10⁻¹¹ (10 s), <2 × 10⁻¹² (100 s)
Holdover	72 hour Stratum 1 level (1 × 10⁻¹¹)
Frequency retrace	±5 × 10⁻¹¹ (72 hrs. off, then 72 hrs. on)
Settability	<5 × 10⁻¹²
Trim range	±2 × 10⁻⁹ (0 to 5 VDC), ±0.5 ppm (via RS-232)
Warm-up time	<6 minutes (time to lock), <7 minutes (time to 1 × 10⁻⁹)
Front-Panel Indicators (Green LEDs)
Power	“On” when AC power is applied
Locked	“On” when frequency is locked to Rb
1 pps input	Blinks with each 1 pps reference input applied to rear panel
1 pps sync	“On” when 1 pps output is synchronized within ±1 µs of 1 pps input
Receive	Blinks when RS-232 characters are received by FS725
Send	Blinks when RS-232 characters are sent by FS725
Rear-Panel Connections
Frequency adjust	0 to 5 VDC adjusts frequency by ±0.002 ppm (normally unconnected)
1 pps input	One 100 kΩ input. Requires CMOS level pulses (0 to 5 VDC). If an external 1 pps input is applied, lock is maintained between the 1 pps input and 1 pps output, with computer adjustable time constant from 8 minutes to 18 hours.
10 MHz outputs	Two 50 Ω isolated sine outputs
5 MHz output	One 50 Ω sine output
1 pps output	One 50 Ω pulse output
Optional outputs	Each option board provides four 10 MHz, one 5 MHz, and one 1 pps outputs. Up to 3 boards can be installed.
Alarm relays	Max. current, 3 A. SPDT, normally open or normally closed. May be wired in parallel with other relays to “wire-or” a single alarm.
Rb lock	Relay status matches the front-panel “Locked” LED.
1 pps	Relay status matches the front-panel “1 pps sync” LED.
RS-232	9-pin connector configured as DCE, 9600 baud. Windows RbMon software is provided.
Environmental
Operating temperature	+10 °C to +40 °C
Temperature stability	∆f/f < ±1 × 10⁻¹⁰ (+10 °C to +40 °C)
Storage temperature	–55 °C to +85 °C
Magnetic field	∆f/f < 2 × 10⁻¹⁰ (1 Gauss field reversal)
Relative humidity	95 % (non-condensing)
General
AC power	90 to 132 VAC or 175 to 264 VAC, 47 to 63 Hz, 50 W
Dimensions (W × H × L)	8.5" × 3.5" × 13"
Weight	9 lbs.
Warranty	One year parts and labor on defects in materials and workmanship

Important: The rear-panel 1 pps input requires CMOS-level pulses (0 to 5 VDC) into its 100 kΩ input.

Recommended pairing: add Option 01, 02, or 03 distribution amplifier boards (6, 12, or 18 outputs) to expand the FS725's available 10 MHz, 5 MHz, and 1 pps output count.

About this Pre-Owned unit

This pre-owned unit is inspected and functionally verified in-house before it ships and is backed by our pre-owned warranty. To confirm its exact condition, firmware revision, installed options, or included accessories for your application before ordering, contact our Test Architects.

Backed by a ValueTronics warranty
Functional verification included
Standard Calibration Upgrade Options: No Calibration Required, NIST Traceable, Z540.1 or ISO 17025 with Data, Z540.3 Guardbanding with Data.
Note that unnecessary accessories may not be included (contact Test Architect to confirm).

ValueTronics supplies both new and used test and measurement equipment. New units ship factory-sealed, exactly as received from the manufacturer; every used unit is inspected and functionally verified in-house at our 20,000 sq ft secure facility in Elgin, Illinois before it ships. Our Test Architects can help you select the condition, calibration, and configuration that fit your application.

Please review the Manufacturer's Data Sheet to verify published specifications. Feedback on this webpage is always welcome — please reach out to your Test Architect at any time for questions or concerns. Thank you, we truly appreciate you being our customer.