Fluke 434II

Fluke 434II Power Board

Product  Description：

Fluke Power Boards are highly specialized, precision-engineered electronic assemblies found inside Fluke’s world-renowned diagnostic, calibration, and power quality measurement instruments. These boards are responsible for primary power conditioning, voltage regulation, and isolation within the device. Because Fluke instruments are used to measure electrical systems safely, their internal power boards are built to the highest safety and accuracy standards, ensuring that the tool itself remains isolated from high-voltage transients occurring on the test leads.

Product Parameters

The technical parameters of a Fluke Power Board emphasize absolute electrical safety, high isolation, and low noise:

• Input Voltage Tolerance: Designed to handle wide-range internal battery inputs (typically 7.2V to 15V DC) or external AC/DC charger inputs ranging from 90V to 264V AC.

• Measurement Category Rating: Engineered to support overall instrument compliance with CAT III 1000V and CAT IV 600V safety standards.

• Transient Overvoltage Protection: Onboard surge suppression networks capable of withstanding peak impulse voltages up to 8000V.

• Output Rail Stability: Delivers multiple ultra-low-noise DC rails, such as 3.3V, 5V, and isolated 15V, with ripple voltage maintained below 5 millivolts to prevent measurement distortion.

• Isolation Resistance: Galvanic isolation between the power supply stage and the sensitive measurement logic rated at over 1000 Megohms.

• Efficiency Rating: High-efficiency synchronous rectification design, minimizing internal heat generation to prevent thermal drift in the device's measurement circuitry.

Product Advantages

Fluke Power Boards are distinguished by their ruggedness and role in ensuring measurement accuracy:

• Industrial-Grade Safety Isolation: Uses advanced optoelectronic and planar transformer isolation to completely separate the user-facing control logic from the high-voltage input channels.

• Low Electromagnetic Interference: Designed with multi-layer PCB shielding and optimized trace geometry to minimize internal EMI, which is essential for capturing microvolt-level signals without interference.

• Thermal Stability: Utilizes high-grade components with low thermal coefficients, ensuring that the power supply does not create internal hot spots that could affect calibration accuracy.

• Robust Fault Protection: Features multi-layered hardware protection, including fast-acting fuses, metal oxide varistors (MOVs), and transient voltage suppressors (TVS), to shield the internal processor from external faults.

• Long-Term Reliability: Built with premium, extended-lifecycle capacitors and semiconductor modules to ensure the instrument maintains its calibration parameters over years of field use.

Product Applications

These internal power boards are integral to Fluke's specialized portfolio of testing and troubleshooting tools:

• Power Quality Analyzers: Supplying stable, clean energy to the processing cores of tools that analyze three-phase grid anomalies, harmonics, and dips.

• Industrial Process Calibrators: Providing the precise, isolated loop power needed to calibrate 4-20mA transmitters and smart field sensors without introducing ground loop errors.

• High-Precision Digital Multimeters: Powering the analog-to-digital conversion stages in benchtop and handheld multimeters used in laboratory and field environments.

• ScopeMeter Test Tools: Serving as the core power management hub for handheld oscilloscopes, balancing battery efficiency with high-bandwidth processing needs.

• Thermal Imaging Cameras: Managing the power distribution for infrared sensors, laser distance meters, and high-resolution display screens.

Important Precautions

To prevent damage to the power board and ensure user safety during maintenance or calibration, follow these rules:

• Strict Safety Discharge: High-voltage capacitors on the board can hold significant charge even after the battery or AC adapter is removed. Always discharge the board safely using a specialized resistor before servicing.

• Calibration Seal Integrity: The power board is directly linked to the reference voltage of the tool. Unauthorized replacement or tweaking of power board components will invalidate the instrument's calibration certificate.

• Exact Component Replacement: If a protective fuse or varistor on the power board fails, it must be replaced with an identical, factory-certified part. Using a standard commercial fuse can compromise the CAT rating and cause catastrophic failure during a high-voltage surge.

• Contamination Control: Ensure that the board remains entirely free of dust, moisture, and flux residue during handling. Contaminants can create leakage currents across the high-isolation barriers, leading to inaccurate readings or internal arcing.

• Grounding and Shielding: When reinstalling the power board into the instrument chassis, ensure all spring contacts, shielding foils, and grounding screws are correctly aligned and tightened to maintain the device's safety envelope.

The structure and details of the product：

Our services：

Shipping Port:  China

Payment: Bank of Chicago, Bank of Singapore

Express cooperation: fedex, DHL, UPS and your express account

Service: Professional Sales provides 24 hours /7 days online service

Warranty: one year

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