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HP 5061B Cesium

Frequency Standard

Option 003 & 004


This HP 5061B Frequency Standard has the following features:

  • Front and rear outputs for 10MHz, 5MHz, 1MHz & 100KHz

  • Datum High Performance Cesium Tube Upgrade.

  • Option 003 clock & standby power supply. 

This instrument had option 004 but has been upgraded to a Datum Cesium tube which has a rated performance slightly superior to option 004 (high performance Cesium Tube).  The 5061B locked after only a few minutes and the system seems to be operating correctly to the level our lab is capable of looking at it.  We did not go through all the fine adjustments to get the maximum performance from the system, but what we saw was very impressive. 

The standby power supply battery pack is solid. 

Datum Replacement Tube Specifications

Additional Information

  • The tube serial number is 9920G5.
  • Part number 03667 502.
  • Model FTS 7505A.
  • The Ion pump quickly zeroed.
  • The beam current can easily be adjusted to max the Beam I meter

The instrument is in very good physical condition as can be seen in the photos. It has a few minor dings and scratches.  The Reserve on this item is $2899.00



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.

Ascent Concepts and Technologies is a Research & Development Lab.  As a service to the companies and institutions we work with, we broker their excess equipment & acting as application specialists on their new equipment needs.  We are now offering quality used equipment to the public with the same level of professionalism and service.   Please feel free to email at thomasknox@ascentconcepts.com or call Thomas @ 1-303-554-0307 with any Technical questions.  Please feel free to email at waltwhite@ascentconcepts.com or call Walt @ 1-720-276-8288 with any Shipping or Logistical questions. We make every effort to evaluate and guarantee our equipment.  Although we do not provide NIST traceable calibration, we do have in house calibration equipment and will make every effort to test and verify performance on equipment we sell.  However we do not warranty any items shipped outside the United States. 

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