CT4121 FET Probe Kit offers a bandwidth of 1.2 GHz.

Press Release Summary:

CT4121 FET Probe Kit can measure up to ±40 V with an accuracy of ±2%. Used for timing analysis or troubleshooting high speed logic circuits and wireless and data communication design, unit comes with power indicator LED and SMD accessory kit. Probe can be powered with 9 V battery or from the oscilloscope using the USB power lead.

Original Press Release:

New CT4121 Active FET Probe Kit

Today Cal Test Electronics introduces a new active FET probe kit. The CT4121 is a compact FET probe with very high input resistance and low input capacitance. With a 1.2 GHz bandwidth, this probe is ideal for timing analysis or troubleshooting high speed logic circuits, for design verification of disk drives, as well as for wireless and data communication design. The CT4121 can measure up to ±40 V (DC + AC peak). Compatible with oscilloscopes from all major manufacturers, the probe is powered by the included 9 V battery or direct from the oscilloscope using the included USB power lead.

Probe features:

  • 1.2 GHz bandwidth (-3 dB)
  • Up to ±40 V (DC + AC peak)
  • Attenuation 10x
  • High accuracy (±2%)
  • Power indicator LED
  • SMD accessory kit


MSRP of $760, the CT4121 is available immediately.

Product Datasheet

CT4121 Datasheet http://www.caltestelectronics.com/images/attachments/CT4121_datasheet.pdf

About Cal Test Electronics

Since 1995, Cal Test Electronics has been serving the electronic and electrical markets with an extensive line of quality test accessories and a commitment to total customer service. We evolved for the specific purpose of providing customers with products they need to get their tasks completed. Our mission is to provide you with both a quality product and 30 years of expert knowledge so that you can remain focused on your goal. Our job is to make your testing life easier. If you are in the electronic, electrical, maintenance or process control industries, we offer the most comprehensive lines of test accessories. With over 3,000 items in 7 product categories, there is almost no test accessory challenge Cal Test cannot meet.


Marco A. León

Vice President of Sales & Marketing

22820 Savi Ranch Parkway

Yorba Linda, CA 92887

Phone: 714-221-9330

Fax: 714-921-9849


Download Spec Sheet

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