Adjustable Low-Voltage Electroscope Starting Voltage Test Box

The MOEORW-WDY5 Adjustable Low-Voltage Electroscope Starting Voltage Test Box is a specialized testing instrument designed in strict accordance with utility safety tools testing regulations (DL/T 1476-2023 Preventive Test Regulations for Electric Power Safety Tools and Equipment and DL/T 740-2014 Capacitive Voltage Detectors). It is developed for the 0.4kV low voltage electroscope verification and preventive testing of 0.4kV (400V) low-voltage electroscopes and voltage detectors, ensuring that these critical safety devices function correctly before field use.

The instrument outputs a pure sine wave voltage test source at power frequency (50Hz), accurately measuring the starting voltage of electroscopes to determine whether they remain effective and reliable. It is widely used in preventive testing programs, pre-operation on-site inspections, and acceptance testing for newly purchased or repaired electroscopes.

1. Full Compliance with Utility Safety Standards

Designed to meet the latest utility safety tools testing regulations (DL/T 1476-2023 and DL/T 740-2014), the MOEORW-WDY5 provides legally defensible test results that are fully traceable to national metrology standards. For 0.4kV low voltage electroscope verification, the pass/fail threshold is clearly defined: starting voltage must fall between 60V and 160V. The tester directly supports this determination, eliminating guesswork.

2. True Pure Sine Wave Output

Unlike low-cost square-wave generators, the MOEORW-WDY5 delivers a true pure sine wave voltage test source at 50Hz. This is critical because electroscope internal detection circuits are calibrated for real grid waveforms. Non-sinusoidal sources can produce false readings-our pure sine wave ensures test results match real-world grid conditions.

3. Smooth 0-220V Manual Adjustment

The manual control knob provides smooth, continuous adjustment across the full 0-220V adjustable AC voltage source range. This allows operators to slowly increase voltage as required by test procedures, precisely capturing the moment when the electroscope first emits a stable audible and visual alarm. The long-travel potentiometer design ensures repeatable and reliable readings across multiple tests.

4. Built-in Isolation Transformer for Safety

The built-in isolation transformer provides complete electrical separation between input and output circuits. This design protects operators from accidental shock and suppresses harmonics from the AC line, ensuring digital voltage readings are accurate and stable.

5. Integrated Portable Enclosure

Housed in an insulating, flame-retardant carry case, the instrument integrates all necessary components into a single portable unit. It is equally suitable for fixed laboratory use and on-site field testing, reducing setup time by over 50% compared to bulky transformer systems.

6. Mandatory Grounding Protection

A dedicated grounding terminal is provided and clearly marked. The test procedure requires a secure earth ground connection before operation, enforcing safe work practices and reducing the risk of electric shock during testing.

For B2B clients, product reliability and supply chain stability are as important as technical specifications. Our factory is certified to ISO 9001:2015 quality management standards. Every unit undergoes a rigorous 48-hour burn-in test and individual calibration before shipment. Each instrument is shipped with its own factory calibration record, providing full traceability for your quality assurance program.

Premium Component Selection: We use 100% copper windings in our transformers and voltage regulators-never aluminum. Copper provides lower resistance, better heat dissipation, and longer service life under continuous load.

Conformal Coating for Reliability: All internal circuit boards are coated with a conformal protective layer (three-proof paint) that resists moisture, salt spray, and mildew-particularly important for equipment used in humid environments up to 85% RH.

Production Capacity: With a monthly production capacity of over 200 units, we fulfill bulk orders with consistent quality and on-time delivery. Our automated testing stations ensure every unit meets the same high standards.

After-Sales Support: We provide a standard manufacturer's warranty covering manufacturing defects. For large fleet operators, we offer optional loaner units during repair periods to minimize testing downtime.

Preventive Testing Programs: Regular (typically annual) inspection cycles for utility companies, industrial plants, and electrical contractors.

Pre-Operation Field Checks: Rapid on-site verification before crews begin work on low-voltage systems.

New Equipment Acceptance: Testing newly purchased electroscopes or units returned from repair to confirm they meet performance specifications.

Training and Demonstration: Ideal for teaching personnel proper testing techniques and electroscope functionality.

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1. Connect the electroscope under test to the output terminals.
2. Connect the electroscope hand grip to the instrument's common ground terminal.
3. After power-on, slowly rotate the adjustment knob clockwise to increase output voltage.
4. When the electroscope first emits a stable audible and visual indication, stop adjusting and read the voltage from the digital display.
5. Record this value. Repeat 2–3 times and average the results.
6. Slowly reduce voltage to zero, power off, and discharge the output terminals before disconnecting.

For 0.4kV low voltage electroscope verification, the pass/fail criteria are:

1.Main test box ×1
2.Power input cable (AC220V) ×1
3.High-insulation test connecting wires (pair) ×1
4.Safety grounding wire ×1
5.Original product operation manual (Chinese & English) ×1
6.Spare fuse of specified specification ×2
7.Portable storage strap ×1

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