No. 2-014 (KATC-V)
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PM-19-10-004, Rev F
OPERATING INSTRUCTIONS
KNOPP TYPE KATC-V
AUTOMATIC TRANSFORMER COMPARATOR
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1. General Information
The Knopp Automatic Transformer Comparator (KATC-V) is used to measure the
ratio and phase angle errors of voltage transformers with respect to a "standard"
transformer. This microprocessor-based instrument automatically selects the opti-
mum measurement range, computes the results, and digitally displays the trans-
former errors, the ANSI accuracy class for which the transformer qualifies, and the
test voltage.
The KATC-V has protective circuitry that helps prevent damage when the Trans-
former-Under-Test (TUT) is improperly connected. Options allow connection to a
computer via an RS-232C serial port.
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2. Specifications
Input Power:
120 VAC, 50/60 Hz, less than 0.2A
Test Frequency:
60 Hz (50/60 Hz optional)
Test Voltage Range:
50 to 150V (in the secondary of the TUT)
Ratio Error Range:
–100% to +1000% (0 to 10 Ratio Correction Factor)
Phase Error Range:
–1000 to +1000 minutes
Accuracy Class Range:
0 to 100
Accuracy:
±(0.75% of r 1 Least Significant Digit)
Interlock Relay:
Capable of carrying 120/240 Volts at a maximum of 10
Amperes
Burden on Standard
Transformer:
Less than 0.2 VA at 120V
Burden on TUT:
Less than 0.05 VA if within 0.6 accuracy class