TDR Time Domain Reflectometer. Fast Clock, USB Power. Detect cable faults & More

Description

Fast Clock Time Domain Reflectometer (TDR) - Powered by USB
Please Note:
The design has been modified to use a 'SIL' style resistor to
replace a number of discrete resistors. This in no way affects the operation, see photo # 2 for the latest board
revision
Description
Using a fast square wave clock, this TDR when coupled to a medium speed (50 MHz typically) or faster Oscilloscope, can be used to quickly determine key parameters about cable lengths, position of cable faults and assist in cable characterization.
Designed to attach directly to an oscilloscope input BNC, and if available be powered by the scopes USB port. The effect of the TDR on measurements is minimized by having the male scope connector in  direct line/proximity to the test BNC, which is located on the opposite side of the PCB.
The TDR is powered via the USB B port, and this provides a convenient 'field use' option for powering the TDR from the scope itself, another USB source or a battery power bank.
In use the TDR clock signal is 'stretched' out on the oscilloscope to display the square wave 'ringing', once achieved the test cable can be attached and the un-terminated return pulse will cause a second 'bump' in the square wave to be seen on the display (see photos in listing).
Using simple math and the return path speed measured from the scope display, cable length can be determined.
TO FIND OUR 12VDC POWERED VERSION SEARCH ITEM # 152587007700
Whats included:
1. Fully populated TDR PCB
2. USB A - B cable
PLEASE NOTE - NO OSCILLOSCOPE INCLUDED IN SALE - SHOWN IN PICTURES FOR ILLUSTRATION ONLY.
Questions
We always respond to questions about the product for sale - please ask before making your purchase, if any details are unclear or you need clarification.  Remember the photos are also part of the sale description.
Other Details:
1. USPS Shipping is free within the USA, Overseas buyers will pay shipping and import fees. We ship in one business day after receipt of full payment.
2. Please make sure your ship to address is correct with ebay, this reduces shipping delays and issues.
3. Returns - start a return by accessing ebay customer support on your ebay account page, we generally offer 60 day return windows.
4. We provide follow up technical support after sale if needed - we are only an email away.
About Feedback:
We always leave positive feedback after shipping your item, no exceptions. Our products and service are all designed to give you the customer a 5 Star experience, however, we understand that sometimes things can go wrong (we are only human), and occasionally we may not meet our high standards or your expectations.
Before leaving less than 5 Star feedback, or Neutral/Negative feedback for us, please give us an opportunity to resolve the situation to your satisfaction first. We are only an email away and will always respond.