Transformer Winding Resistance Meters & Load Tap Changer Analyzer QLTCA-40

Transformer Winding Resistance Meters & Load Tap Changer Analyzer QLTCA-40

The QLTCA-40 is Amperis’ winding resistance meter and load tap changer contact analyzer. The QLTCA-40 is designed to accurately measure the winding resistance of highly inductive power transformers. The unit’s triple resistance reading input channels can measure three winding resistances simultaneously.

Two-wire (Kelvin) connections provide high accuracy and require no lead compensation. A special feature of this device is its ability to measure and graph the resistance trace of a transformer LTC or voltage regulator contact during operation. One resistance input channel is dedicated to this feature. The QLTCA-40 provides stable resistance readings of very large transformers by utilizing a 60 Vdc power supply capable of outputting a test current up to 40 Amperes.


  • Transformer Load Tap Changer Control
  • Resistance Reading Features
  • USB Flash Drive and Computer Interface
  • AC Motor Current Monitoring
  • Built-in Safety Features
  • User Interface
  • Dynamic Resistance Test Features
  • Built-in Thermal Printer
  • Internal Test Record Storage

QLTCA-40 Technical Specifications


Load tap changer analyzer

Physical specifications

25”W x 8.5”H x 20” D (63.5 cm x 21.6 cm x 50 cm); Weight: 46 lbs (20 kg

Operating voltage

100 - 240 Vac, 50/60 Hz

Resistance reading range

1 micro-ohm - 500 ohms


1 - 19,999 micro-ohms: ±0.5% reading, ±1 count;
20 - 999 milli-ohms: ±1% reading, ±1 count;
1 - 500 ohms: ±1.5% reading, ±1 count

Test current

1 ampere, 5 amperes, 10 amperes, 40 amperes

Test voltage

60 Vdc max

Resistance channels

Three static resistance reading channels, One dynamic resistance channel

Ac current input

Clamp-on current sensor, 1 – 20 Amperes


Back-lit LCD Screen (128 x 64 pixels); viewable in bright sunlight and low-light levels


Built-in 4.5-inch wide thermal printer

Internal data storage

Stores up to 128 static resistance test records (48 tests per record) and 11 dynamic resistance test records

External data storage

One USB Flash drive interface port; stores up to 999 test records on a USB Flash drive (not included)

Computer interface

One RS-232C port, one USB port

Load tap changer contact

Designed to meet IEC 61010 (1995), UL 61010-a, and CAS-C22.2 standards


Designed to meet UL 61010A-1 and CAN/CSA C22.2 No. 1010.1-92 standards


Operating: -10°C to +50°C (+15°F to +122°F); Storage: -30°C to +70°C (-22°F to +158°F)


90% RH @ 40°C (104°F) non-condensing


2,000 m (6,562 ft) to full safety specifications


One 50-foot current cable set, three 50-foot resistance cable sets, ground cable, USB cable, RS-232C cable, LTC cable, power cord, cable bag

Optional accessories

Transportation case


1 year on parts and labor

NOTE: the above specifications are valid at nominal voltage and ambient temperature of +25°C (+77°F). Specifications are subject to change without notice

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