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HP 5061A Cesium

Time / Frequency Standard


This HP 5061A Cesium Beam Time / Frequency Standard has been fully tested.  Combined error against my GPS Locked Time Standard was 5 x 10-12 .  It has had all routine maintenance performed (Ion Pump operated for 24hours every three months during storage).  This auction includes a copy of the operation and service manual.  This Instrument uses a standard AC power cord.   The unit is in very good condition with a few dings and scratches on the case.


Cesium Standard compared to GPS Locked Counter


HP Atomic frequency have long been the world wide standard for frequency and time keeping.  The 5061A is part of that tradition.  Self checking control standards yields exceptional accuracy.  This accuracy combined with high reliability made the HP 5061A the choice of national laboratories for many years.  Now with the introduction of the 5071A, the 5061A and be purchased for a fraction of their $32,000 Original Price.

Front panel controls provide a circuit check switch and a meter for monitoring performance.  Front panel lights also provide an indication of any interruptions of continuous operation.   The crystal oscillator is locked to atomic residence.


Output Frequencies                    5MHz, 1MHz & 100KHz.

Accuracy                                      +/-  6 x 10-12

Long Term Stability                     +/- 5 x 10-12

Short Term Stability 

        Averaging Time  .01             1.5 x 10-10

        Averaging Time  1                5.6 x 10-11

        Averaging Time  10              2.5 x 10-11       

        Averaging Time  100            8 x 10-12

Reproducibility                             +/- 5 x 10-12

Settability                                     +/- 7 x 10-13

Warm Up                                       @ 25 degrees C = 45 min.


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.  All equipment we sell comes with a three day right of return unless stated otherwise.

Shipping Policy

Buyer will pay $40.00 packing + actual shipping.  We will make every effort to ship within 24 hours of receipt of payment.  We ship with FedEx & UPS 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