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Tektronix  AM503B 

Current Measurement System


AM503B Current Amplifier

A6302 Current Probe

 TM502A Power Supply

The AM503S Current Probe System is the most versatile current measurement system available. Since the probes incorporate both a transformer and a Hall Effect device, broadband AC/DC current can be measured simultaneously. Depending on the probe used, current from DC to 100 MHz and up to 700 A can be measured by clipping the split-core probes around the conductor. The AM503S is truly a system, consisting of an AM503B Current Probe Amplifier, a TM502A two-wide Power Module and an A6302 Current Probe.

The unit is in excellent condition.  Fully tested and performing flawlessly.

  • GPIB Programmable Current Probe Amplifier
  • Plugs into TM5000 Power Modules
  • Operated with External Controller or Manually from Front Panel
  • Manual Current Probe Amplifier
  • Push Button Auto Balance/Degauss
  • Bright LED Current/Division Display
  • Plugs into TM500/5000 Power Modules
  • AC/DC Measurements

  • With A6302 Probe:
    • DC to 50 MHz
    • 20 A Continuous/50 A Peak
    • Max. Conductor Diameter: 0.15 in.


AM503B Current Probe Amplifier

The AM503B Current Probe Amplifier is the heart of the AM503S System. The AM503B amplifies and sums the voltage outputs from the transformer and Hall Effect device and outputs it to the measurement instrument. It also provides the Hall Effect Device bias voltage and a reverse "bucking" current that resists saturation of the A6312/A6302/A6303 Current Probe core.

The AM503B Current Probe Amplifier replaces the AM503A. All functions are microprocessor controlled, providing a significant improvement in ease of use and functionality. The AM503B uses bright, easy-to-read LEDs to display current/division settings which are controlled with up/down push buttons. A single push button provides both Degauss and auto-balance functions. An additional significant improvement with the AM503B is that individual A6312/A6302/A6303 probes no longer need to be calibrated with a specific amplifier but can be interchanged between AM503Bs and AM5030s. The AM503B and the AM5030 both support the XL Series of current probes. The AM503 and the AM503A do not support the XL Series. The AM503B operates in any TM500/TM5000 power module. The 50 Ω output of the AM503B can be displayed on any oscilloscope or measurement instrument that has a sensitivity setting of 10 mV/div. A 50 Ω output cable and termination is included with the AM503B. The scope or measurement instrument requires at least a 400 MHz bandwidth to display the full bandwidth of the A6312 (100 MHz) and 50 MHz for the A6303. You can select either AC only mode or a DC mode which allows you to display a combined AC/DC current signal.




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 $35.00 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.



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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