The LQ Series Sphere Gap Voltmeters utilize matched-diameter spherical electrodes to form an IEC 60052-compliant measurement and protection system when integrated with:

• High-voltage test transformers

• Control consoles

• Voltage regulators

• Water resistors

Key functions in power frequency testing:
✅ Direct high-voltage measurement (50/60 Hz AC)
✅ Overvoltage protection for devices under test (DUTs)
✅ Transient suppression via 1-ohm-per-volt protective resistors

Step-by-Step Calibration Procedure

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System Configuration Diagram

Alt text: "IEC-compliant sphere gap installation diagram for high-voltage test systems"

1. Parallel Connection
   Connect sphere gap in parallel with DUT through protective resistor chain

2. Three-Point Calibration

   Test Voltage %	Measurement Protocol
   60%	Record 3-4 averaged LV side readings
   70%	Repeat with DUT energized
   80%	Establish linear curve baseline

3. Protection Setting
   Adjust gap to 110-115% of target test voltage for overvoltage discharge protection

Technical Specifications & Ordering Guide

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Electrical Parameters

Configuration Options

• Electrode Material: Oxygen-free copper / Chrome-plated steel

• Insulation Class: 250kV/cm (dry air, 25°C)

• Customization: Contact engineers for >300kV systems

Compliance & Safety Features

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IEC Standard Implementation

• IEC 60052: Voltage measurement procedures

• IEC 61109: Clearance distances for live parts

• IEC 61243: Live working requirements

Protection Mechanism

• Automatic arc quenching through resistor network

• Fail-safe gap locking during discharge events

• EMI-shielded measurement circuits