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Heathkit IT-28 Capacitor Checker, US $210 – Picture 0
Heathkit IT-28 Capacitor Checker, US $210 – Picture 1
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Heathkit IT-28 Capacitor Checker, US $210 – Picture 5
Heathkit IT-28 Capacitor Checker, US $210 – Picture 6
Heathkit IT-28 Capacitor Checker, US $210 – Picture 0
Heathkit IT-28 Capacitor Checker, US $210 – Picture 1
Heathkit IT-28 Capacitor Checker, US $210 – Picture 2
Heathkit IT-28 Capacitor Checker, US $210 – Picture 3
Heathkit IT-28 Capacitor Checker, US $210 – Picture 4
Heathkit IT-28 Capacitor Checker, US $210 – Picture 5
Heathkit IT-28 Capacitor Checker, US $210 – Picture 6

Heathkit It-28 Capacitor Checker

US $210

  • Gulfport, Mississippi, United States
  • Jan 29th
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A very good refurbished Heathkit IT-28 that has been tested.  The switches have been cleaned and the filter capacitors replaced as well as the 2mfd./630 volt input cap. I installed a higher voltage rating to match the reform voltage output and it also has a higher ESR rating.  It will outlast the 2mfd./250 volt original for many years to come.  I checked one of the old 40mfd. paper capacitors that i removed and found it to be leaky.  Useing the formula KxC+.3,where I =.04x40+.3 showed leakage.   Approximately 15 microamperes is required to close the eye when testing electrolytics and 2 microamperes for paper,mica and resin capacitors.  I calibrated the unit by placing a 200 ohm 1% precision resistor across the test terminals with the generator switch set to internal function.  Posistioning the the pointer straight down over the 1 at the center of the external standard scale.  Very carefully ajusting the balance control for maximum eye opening.  I used a 100,000 ohm resistor to calibrate the electrolytic scale and a 1.5 meg. to calibrate the minimum 25 volt low end of the checker.  I will package it well for shipping and in should remain in check during shipping,but it is easy to recalibrate if need be.  I hope you will enjoy this unit it does so much more than most of the digital meters on the market today and is a great addition to any technician or engineers work bench.  Thank you for your consideration of this item,overseas buyers are welcome.  KF5QAA
Condition Seller refurbished :
An item that has been restored to working order by the eBay seller or a third party not approved by the manufacturer. This means the item has been inspected, cleaned, and repaired to full working order and is in excellent condition. This item may or may not be in original packaging. See the seller’s listing for full details.
Seller Notes “Very clean tested,working capacitor tester”

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