The Megger S1-552/2 is a microprocessor-controlled 5 kV digital insulation tester designed for comprehensive insulation resistance measurements and diagnostic tests. It offers a range of features for accurate and reliable testing in various electrical environments.
Function Description:
The S1-552/2 is primarily used for measuring insulation resistance up to 15 TΩ. It performs automatic tests, including Insulation Resistance (IR), Polarization Index (PI), Step Voltage (SV), and Dielectric Discharge (DD) tests. The instrument can be powered by mains supply or its internal rechargeable battery, providing at least 6 hours of continuous testing with a 100 MΩ load. It features data storage and retrieval, allowing users to record and download test results to a PC via USB or RS232 connections. The device also includes safety warnings and indicators for high voltage, external voltage detection, and battery status.
Important Technical Specifications:
- Measurement Capability: Up to 15 TΩ insulation resistance.
- Test Voltages:
- Standard: 250 V, 500 V, 1 kV, 2.5 kV, 5 kV.
- Non-standard: Selectable between 50 V and 1 kV in 10 V steps, and between 1 kV and 5 kV in 25 V steps.
- Voltage Input Range: 85-265 V rms, 50/60 Hz, 60 VA.
- Battery Life: Approximately 6 hours of continuous testing at 5 kV with a 100 MΩ load. A full recharge takes 14 hours.
- Accuracy (23°C, 5 kV):
- Insulation Resistance: ±5% to 1 TΩ (5000 V, 2500 V, 1000 V, 500 V, 250 V), ±20% to 10 TΩ (5000 V, 2500 V, 1000 V, 500 V, 250 V).
- Capacitance Measurement: ±5% ±5 nF.
- Voltage Output: +4%, -0% ±10 V of nominal test voltage at 1 GΩ load (0°C to 30°C).
- Current Measurement: ±5% ±0.2 nA at all voltages.
- Current Measurement Range: 0.01 nA to 5 mA.
- Short Circuit/Charge Current: 5 mA at 5 kV.
- Capacitor Charge Time: <1.5 seconds per µF at 5 mA to 5 kV.
- Capacitor Discharge Time: <120 ms per µF to discharge from 5 kV to 50 V.
- Capacitance Measurement Range: 10 nF to 50 µF (dependent on test voltage, minimum 500 V test voltage).
- Timer Range: Counts up to 99 minutes and 59 seconds. Minimum settings: 15 seconds for test voltage ≥1000 V, 30 seconds for test voltage <1000 V.
- Display Range:
- Digital: 10 kΩ to 15 TΩ (3 digits).
- Analogue: 100 kΩ to 1 TΩ.
- Interference Rejection: 1 mA per 250 V up to a maximum of 3 mA.
- Operating Temperature: -20 °C to 50 °C.
- Storage Temperature: -25 °C to 65 °C.
- Humidity: 90% RH non-condensing at 40 °C.
- Ingress Protection (lid closed): IP65.
- Dimensions: 305 x 194 x 360 mm (12 x 7.6 x 14.2 inches).
- Weight: 7.1 kg (16 lb) approx.
- Safety: Meets IEC61010-1 CAT IV 600 V.
- EMC: Meets EN61326-1.
- Interface: RS232 (38400 Baud, 8 data bits, 0 parity, 1 stop bit, no flow control) and USB.
Usage Features:
- Continuous Measurement: Displays resistance or current on the main display, with optional resistance, current, or figure of merit measurements on the secondary display.
- Test Modes: Supports Insulation Resistance (IR), Polarization Index (PI), Step Voltage (SV), and Dielectric Discharge (DD) tests.
- Programmable Timers: Includes a main test duration timer, plus T1 and T2 timers for time resistance method tests. The Dielectric Absorption Ratio (DAR) is automatically calculated if T1 and T2 timers are set.
- Burn/Breakdown Mode: In IR test mode, users can select either 'Burn' mode (continues test after breakdown to locate failure) or 'Breakdown' mode (terminates test to prevent damage).
- Alarm Limit Mode: Allows setting a resistance threshold; the instrument beeps if the reading exceeds this limit.
- Load Capacitance and Time Constant: Measurements are displayed at the end of a test.
- High Voltage Warning: A red LED flashes and a beeper sounds if external voltage on test leads exceeds 50 V, disabling testing.
- Guard Terminal: Used to eliminate surface leakage currents for more accurate measurements, especially at high test voltages or in moist/dirty conditions.
- Data Storage and Retrieval: Stores selected voltage, test time elapsed, applied voltage, leakage current, insulation resistance, PI, DAR, capacitance, time constant, and DD values. Results can be downloaded to a PC using Megger Download Manager. Real-time data output is available via serial connection.
- LCD Backlight: For improved visibility.
- User Interface: Intuitive button controls for selecting test voltage, starting/stopping tests, toggling display information (Ω/I button), and accessing functions (Fn button, Mode button, Timer buttons, Record button).
- Safety Features: Automatic discharge of capacitive circuits after tests, internal battery management system for auto-shutdown after inactivity, and prevention of inadvertent test starts.
Maintenance Features:
- Cleaning: The instrument can be cleaned with a slightly damped cloth using soapy water or Isopropyl alcohol (IPA) after disconnecting it from power.
- Battery Management: Internal rechargeable battery with a level indicator on the LCD. The battery charges automatically when connected to mains, except during testing. For optimum battery life, it should be charged after each use.
- Fuse Replacement: If the internal guard terminal fuse blows, indicated by 'FUS' on the display, it must be replaced by an authorized repairer. The instrument can still be used without the guard terminal in the interim.
- Service and Repair: Megger operates fully traceable calibration and repair facilities. For battery replacement or other repairs, the unit must be sent to a Megger authorized service agent.
- End-of-Life Disposal: The instrument and its sealed lead-acid battery should be recycled as electronic waste, not disposed of with general waste, in accordance with local authority requirements.
- Warranty: New instruments are guaranteed for 1 year from the date of purchase. Unauthorized prior repair or adjustment invalidates the warranty.
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