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Agilent 53131A 12.4GHz

Universal Counter

This is not you typical 53131A; It is loaded with not only Option 124 (12.4 GHz C channel) but also Option 060 (Additional rear connectors).

This instrument is in mint condition both physically and electrically. I believe it is just over a year old. I have not checked with Agilent on whether this counter has an extended warranty.


If you are unfamiliar with this instrument the Agilent 53131A has frequency resolution of 10 digits per second, 500ps time interval resolution and a complete set of test and analysis features.   This counter offers 2 channels up to 225MHz and a third channel that measures from 200MHz to 12.4GHz.  This third channel option (#124) can measure signals from -23dBm to +13dBm making it the  highest frequency universal counter offered by Agilent.  Also included in this current product is the rear panel connector option(# 060).

Channels one and two have selectable input impedance  of 1ohm or 50ohm.  Measurements include frequency, time interval, ratio.  Phase angle, totalize, peak voltage, pulse parameters and more.  A single key stroke recalls up to 20 different stored front panel setups, making this one of the easies counters to use for repetitive measurement.



  • Measurements include frequency, frequency ratio, time interval, rise/fall time, phase, duty cycle, positive/negative pulse width, totalize, peak voltage, time interval average and time interval delay
  • Automated limit tests and one-button measurement setups for fast, easy operation
  • Onboard digital signal processing speeds measurements
  • Built-in statistics feature lets you simultaneously measure average, min/max, and standard deviation
  • Small package fits the limited space on your bench top


This would be a great combo with the 58503A GPS Timing unit.

Agilent Data Sheet

This is an upgraded unit.  The faceplate still says 5 GHz.



Warranty -

This item is sold with a 3 Day Satisfaction Guarantee.

 So bid with confidence.

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

  • This item comes with a 3 day right of return policy.
  • All returns must be made within 3 days of receipt. 
  • All warranties are void if the calibration / warranty seals are broken.
  • Equipment must be shipped correctly and returned with all accessories.
  • Customer is responsible for all shipping charges on returns.
  • Foreign Buyers please be aware:  We offer no warrentee or returns on items shipped outside the USA.



Shipping Policy

Buyer will pay $30.00 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 & 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.



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 & act 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 extensive in house calibration equipment and make every effort to test and verify performance on equipment we sell.  However we do not warranty any items shipped outside the United States. 

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