KATC-C1 Instructions Page 13 04/14
Inaccurate Test Current Display
If the display of the Reference Test Current seems to be inaccurate, connect an AC ammeter between
the rear panel "S" terminal and the lead connected to that terminal. Then adjust R9 on Card 2
[accessed through the rear panel] inside the KATC-C1 until the display of Reference Test Current
agrees with the ammeter.
If the display of TUT Test Current (Amps or %) needs to be adjusted, this is an indication that the
entire KATC-C1 is in need of re-calibration. Contact Knopp at the above number to schedule return of
the instrument.
Failed or Suspect Printed Circuit Card
If it is suspected that a component on a printed circuit card has failed, we offer Next Day shipment of
a replacement card. This eliminates the need to troubleshoot the failure down to a particular compo-
nent on a card. While the KATC-C1 is under warranty, the card exchange is performed for no charge.
After the warranty has expired there is a flat charge for the card exchange. Once the new card has
been received and installed, the defective card is returned to Knopp. This method of troubleshooting
allows you to minimize your time spent in diagnosing and repairing individual cards. The following
section provides a reference for the various printed circuit cards.
Printed Circuit Card Listing
The KATC-C1 contains nine printed circuit cards. These cards are accessed through the rear door/fan
assembly of the KATC-C1. A listing of the cards and their corresponding positions in the card cage
follows.
Card #1 – Error Resistor Card
#2 – Standard Amplifier Card
#3 – Error Amplifier Card
#4 – Zero Crossing Card
#5 – Rectifier Card
#6 – Counter Card
#7 – Input/Output Card
#8 – Analog-to-Digital Converter Card
#9 – Microprocessor Card
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