KATC-C1 Instructions
Page 7
04/14
RUNUP mode causes the KATC-C1 to not take any measurements, instead the KATC-C1 selects
its highest internal error range. This mode is used while the test current is being adjusted to mini-
mize chances of damage to the comparator.
This push-button is also used to reset the KATC-C1 after an error that caused an "alarm" condition is
corrected.
HOLD/RUNDOWN Push-button
"Freezes" the displayed data so that the test current can be reduced to zero — with the test data still
available. A box (
¦
) is shown in the display to indicate that the displayed data is “held” and will not
change if the test current is changed. Each press of the HOLD/RUNDOWN push-button causes the
display to briefly show the transformer-under-test secondary current to which the held values apply.
After a couple of seconds the display returns to a real-time display of applied test current.
On systems with an automatic current rundown feature (such as the Knopp KCTS) pushing
HOLD/RUNDOWN also initiates rundown of the test current.
PRINT Push-button
Causes the displayed test result data, along with some heading information, to be sent to the device at-
tached to the RS-232 Serial Communications Port. Sample outputs are shown later in this manual.
Operating Procedures
Connecting the Transformer-Under-Test
If you are using the KATC-C1
without
one of the Knopp Transformer Testing Systems, connect the
transformers according to the instructions for
Portable Use
as shown in the previous chapter. When
using the KATC-C1 with a Knopp Transformer Test System, refer to the instruction manual for your
system for transformer connection instructions.
Performing a Test
1.
When power is first applied to the KATC-C1, the display will momentarily show
RESET
. After
this message disappears, test current is displayed and RUNUP mode is selected. Since the
KATC-C1 can be used with reference transformers and transformers-under-test with either 1 or 5
ampere secondaries, there are three different displays of test current provided to aid the operator.
The Reference Transformer secondary current is always shown as a percentage of the selected
secondary value (1 or 5 amperes). The Transformer-Under-Test secondary current is shown as
both a percentage and actual value.
2.
Adjust the test current
slowly
to the desired value.
3.
Pressing the MEASURE push-button toggles the KATC-C1 between RUNUP and MEASURE
modes.
RUNUP mode selects a high error current range on the KATC-C1 error measurement circuit.
This provides an extra measure of safety to the equipment and allows the current to be in-
creased more quickly than when the KATC-C1 is in the measure mode.
