Stanford PRS10 Rubidium Frequency Standard

PRS 10 Rubidium Frequency Standard

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

Key Facts

The PRS10 is an ultra-low phase noise 10 MHz frequency standard that disciplines a crystal oscillator to a hyperfine transition in the ground state of rubidium.

Features

  • Low phase noise (<-125 dBc/Hz at 10 Hz)
  • Time-tags or phase-locks to a 1 pps input
  • Slewable 1 pps output with 1 ns resolution

Specifications

Output
Output frequency 10 MHz sine wave
Amplitude 0.5 Vrms, ± 10 % (approx. 1.41 Vpp or + 7 dBm)

Key Facts

The PRS10 is an ultra-low phase noise 10 MHz frequency standard that disciplines a crystal oscillator to a hyperfine transition in the ground state of rubidium.

The device fulfills a variety of communication, synchronization, and instrumentation requirements. The phase noise of the 10 MHz output is low enough to be used as the reference source for synthesizers. The unit's short-term stability and low environmental coefficients make it an ideal component for network synchronization. Its low aging rate makes it an excellent timebase for precision frequency measurements.

The PRS10 can time-tag an external 1 pps input with 1 ns resolution. These values may be reported back via RS-232 or used to phase-lock the unit to an external reference (such as GPS) with time constants of several hours. This feature can provide Stratum 1 performance at a very low cost.

The PRS10 establishes a new level of features and performance in atomic frequency standards. Its design provides the lowest phase noise, greatest versatility, and easiest path to system integration of any rubidium frequency standard available.

Sales Region only Germany

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

Features & Benefits

  • Low phase noise (<-125 dBc/Hz at 10 Hz)
  • Time-tags or phase-locks to a 1 pps input
  • Slewable 1 pps output with 1 ns resolution
  • RS-232 for diagnostics, control and calibration
  • Long lamp life and established reliability

Specifications

Output
Output frequency 10 MHz sine wave
Amplitude 0.5 Vrms, ± 10 % (approx. 1.41 Vpp or + 7 dBm)
Phase noise (SSB) <-125 dBc/Hz (10 Hz)
<-140 dBc/Hz (100 Hz)
Spurious <-130 dBc (100 kHz B.W.)
Harmonic distortion <-40 dBc
Return loss >25 dB @ 10 MHz
Accuracy at shipment ± 5x10-11
Aging (after 30 days) <5x10-11 (monthly)
<5x10-10 (yearly
Short term stability <1x10-11 (1 s)
Allan variance <1x10-11 (10 s)
<2x10-12 (100 s)
Frequency retrace ±5x10-11 (72 hrs off then 72 hrs on)
Settability <5x10-11
Trim range ±2x10-9 (0 to 5 VDC)
± 1 ppm (via RS-232)
Warm-up time <5 minutes (time to lock)
<6 minutes (time to 1x10-11)
Voltage sensitivity <2x10-11 for a 1 VDC supply change
Electrical
Input voltage +24 VDC (nom.), +22 VDC (min.), +30 VDC (max.)
Current 2.2 A (warmup), 0.6 A (steady-state) at 25 °C
Protection ±30 VDC to any pin except rf output
RF protection 100 mA (stable with any termination)
Cal reference out 5.00 ± 0.05 VDC
RS-232 9600 baud, 8 bits, no parity, 1 stop bit, 0 to 5 volt levels with x-on/x-off protocol
1 pps measurement ±10 ns (accuracy), ±1 ns (resolution)
1 pps output set ±10 ns (accuracy), ±1 ns (resolution)
Environmental
Operating temp -20 °C to +65 °C baseplate
Temp coefficient ±5x10-11 (-20 °C to +65 °C baseplate)
Storage temperature -55 °C to +85 °C
Magnetic field <2x10-10 for 1 Gauss field reversal
Relative humidity 95 % (non-condensing)
Miscellaneous
Customer AQL1 0.26 %
Customer MTBF1,2 1,600,000 hrs
Design life3 10 yrs
Size 2.00 " x 3.00 " x 4.00 " (HWL)
Weight 1.32 lbs
Baseplate threads 4-40 (4 places)
Connector Mates with ITT/Cannon DAM11W1S series
Warranty Two year parts and labor on materials and workmanship.

1. Preliminary estimates for customer acceptance quality level (AQL) and mean time between failures (MTBF) are based on data from 750 units delivered over a 12 month period to a telecom equipment manufacturer. Two units of the 750 were returned following incoming inspection and environmental testing. Not all specifications were tested by the customer.

2. This MTBF represents a single unit failure in a lot of 748 units with a mean operating time of 90 days. In this customer's application, any ``unlock event" is considered a failure, and the unit is removed from service. Other failures, which are not relevant to this customer's application, may not be detected.

3. Lamp lifetime is the dominant consideration in the design life estimate. The estimate is based on the measured reduction of lamp intensity and the elevation of lamp start voltage with time.

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