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Rhode and Schwarz

Rubidium Frequency Standard


This is a extremely high quality Rubidium Oscillator was the standard in our lab for several years.  It displayed excellent characteristics in both short term and long term stability.  It seems very comparable to our new Datum Cesium Standard.  It is excellent condition.

This Rhode Schwarz Rubidium Standard consists of :

  •  XSRM Rubidium Frequency Standard 238.4011.02

  •  XSRM Frequency Converter  238.0616.02

  •  XSRM Power Supply 237.8013.02


Display of Oscillator Control Voltage

The optimal reading is between 10 and 90.   It reads 50.



Display of Rubidium Performance Check

It may be hard to see in the photo but it is showing the Optimal Reading which is the center of the green scale below the numbered scale.



The is a display of the output.  The combined uncertainty of our Agilent 53132A counter,  58503B GPS receiver and the Rhode Schwarz Rubidium Oscillator appears to be around 3x10(-12) short term stability.



This system is mounted in a nice stand alone case.

 The modules are in a frame which can be pulled from the case and rack mounted.



Rubidium Oscillator Module:

The Front Panel has 5 MHz output.   The oscillator has a meter to display performance.  It displays control voltage and performance check.  It also has a frequency fine tune adjustment.  The meter readings all fall dead center of the recommended readings.  This can be seen in the photos.

The Rear Panel has 5 MHz output  that is used to drive the frequency converter module. It also has a 0-10 Volt frequency controlled output and an alarm output.



Frequency Converter Module:

The Frequency Converter Module has both front and rear outputs of 10mhz, 5 mhz, 1 mhz and 100 khz all rated at 1 Volt.



Power Supply Module:

The Power Supply module has front panel indicator lights for AC supply, internal battery and external battery.  The rear panel has 4 power outputs, each is 22 to 30 Volts.  2 are used to power the rebidium oscillator and Frequency Converter.  It also has an input for an external battery.

The internal batteries have been removed.  Two commonly available 12 Volt batteries could be installed.  We will install new batteries, either gel cell or Ni Mh, for the cost of the batteries to the high bidder if requested.

The Power supply will accept either 115 VAC or 230 VAC at 47 - 440 Hz.





As our many customers will attest, we will do our very best to resolve any customer problems.  But our official policy is: 

  •  All items sold are guaranteed against D.O.A. only. 
  •  All claims must be made within 3 days of receipt. 
  •  All warranties are void if the calibration / warranty seals are broken.



Shipping Policy

Buyer will pay $50.00 packing and shipping in the continental United States.  We will make every effort to ship within 24 hours of receipt of payment.  We ship with FedEx only.  We will be glad to ship with other carriers using the purchasers shipping account.  Please contact us to make any special shipping arrangements. For shipping rate research, our shipping address is Boulder, CO USA ---- Zip Code is 80305.

Foreign buyers:  Unless special provisions have been made, you are responsible for making your own shipping arrangements and all costs related to customs, duties & special packaging requirements.  Please do not ask us to quote you international shipping rates.  Use the address information above to research you own shipping rates.  You can email waltwhite@ascentconcepts.com to get the packaging fee, package weight and size for your research.  Items sold outside the USA are sold as is.  



 Payment Policy

We accept Credit Card payment through Paypal.   We accept Cashiers Check or Money Orders.




The equipment shown is a representation only.  We often have multiple units in stock so please email us with your needs.  We have a large inventory and can usually find any test and measurement item in a short time frame.------Inquires info@ascentconcept.com