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A‑Series OLT Oil Breakdown Voltage Tester

The OLT A-Series oil testers are compact, lightweight, and fully automatic systems designed for dielectric breakdown voltage testing of insulating liquids.

  • Built in compliance with IEC 60156 and safety standards IEC 61010 / IEC 61326-1.

  • Preloaded with international test sequences (IEC, GOST, ASTM) for immediate use.

  • Features a built-in printer, internal data storage, and PC connectivity for reporting.

  • Measures voltage directly on electrodes with a true sine HV output, ensuring accuracy and repeatability.

  • Includes an integrated oil temperature measurement function.

Supplied ready to operate, complete with IEC 60156 test vessel, VDE 0370 mushroom electrodes, Go/No-Go gauge, and accessories.

Key Features

  • Compact and lightweight

  • Fully automatic operation

  • Fully compatible with IEC 60156

  • Preloaded programs for IEC, GOST, ASTM standards

  • Built-in thermal printer

  • Internal memory (512 results)

  • PC connectivity via USB

  • True sine high-voltage on electrodes

  • Direct voltage measurement

  • Integrated oil temperature measurement

  • Safety interlocks with automatic HV cutoff

Technical Specifications

output ac voltage (symmetrical)

  • 80 / 90 / 100 kV rms (OLT-80A / OLT-90A / OLT-100A)

voltage resolution

  • 0.1 kV

measurement uncertainty

  • ±3% of reading

output voltage rise rate

  • 2 ± 0.2 kV/s (programmable per standard)

switch-off time on breakdown

  • < 5 µs

temperature measuring range

  • 5.0 – 50.0 °C

programmed test sequences

  • IEC 60156, GOST 6581, ASTM D877, ASTM D1816 (optional)

electrodes

  • Mushroom type (IEC 60156 basic)

  • ASTM D877 / ASTM D1816 (optional)

test vessel

  • IEC 60156, 400 ml, 1.0 kg

go/no-go gauge width

  • 2.45 / 2.55 mm (basic)

  • Optional: 1, 2, 2.5, 4 mm

display resolution

  • 128 × 64 dot matrix, monochrome

interface languages

  • English, Russian, Turkish

printer

  • Thermal line, 8 dots/mm, 384 dots/line

memory for results

  • 512 test records

pc connectivity

  • USB B-type

input voltage

  • 230 V ±10% (standard)

  • 110/120 V available on request

line frequency

  • 50 / 60 Hz ±1

power consumption (max)

  • OLT-80A: 100 VA

  • OLT-90A: 120 VA

  • OLT-100A: 140 VA

dimensions

  • OLT-80A: 461 × 280 × 271 mm

  • OLT-90A: 420 × 300 × 320 mm

  • OLT-100A: 530 × 315 × 320 mm

net weight

  • OLT-80A: 21 kg

  • OLT-90A: 25 kg

  • OLT-100A: 30 kg

environment

  • Operating temperature: +10 … +55 °C

  • Storage temperature: +5 … +60 °C

  • Relative humidity: ≤80% RH @ 25 °C (non-condensing)

  • Atmospheric pressure: 630 – 800 mmHg

Application

  • Transformer oil dielectric strength testing

  • Acceptance and routine testing in utilities and transformer workshops

  • R&D and laboratory use for quality control of insulating liquids

Standard Accessories

  • OLT A-Series Tester (80A / 90A / 100A)

  • IEC 60156 test vessel with electrodes and cover

  • Go/No-Go gauge

  • Magnetic stirrer + lifting stick

  • USB cable (A-B type)

  • Power cord (C-type plug)

  • Grounding cable

  • Software on USB flash drive

  • Thermal printer paper roll (installed)

  • Fuses (250V/3A) × 2

  • User’s manual

  • Optional ISO/IEC 17025 calibration certificate

  • Optional calibration kit C-80 / C-100

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