Wisman MG Series Miniature High-Voltage DC-DC Module (1.1 kV, 0.3 W)

Overview

The Wisman MG Series is a compact, high-stability DC-DC high-voltage module engineered for precision biasing applications in radiation detection, analytical instrumentation, and scientific research systems. Designed specifically to power proportional counters, Geiger-Müller (G-M) tubes, ionization chambers, photomultiplier tubes (PMTs), and scintillation detectors, the MG module delivers regulated output voltages up to 1.1 kV with ultra-low noise and exceptional long-term stability. Its operation is based on zero-current resonant conversion topology — a proprietary architecture that minimizes electromagnetic interference (EMI), suppresses switching transients, and ensures consistent voltage delivery under variable load and thermal conditions. Unlike general-purpose HV supplies, the MG series integrates six-sided mu-metal and conductive shielding directly into its mechanical enclosure, making it suitable for integration into sensitive low-signal environments such as portable spectrometers, handheld radiation survey meters, and benchtop nuclear instrumentation where signal integrity and EMI immunity are critical.

Key Features

• Output voltage range: 300 V to 1.5 kV DC (standard variants include 1.1 kV); selectable polarity (positive or negative)
• Maximum continuous output power: 0.3 W, optimized for low-current detector biasing (e.g., PMT dynode chains, G-M tube quenching circuits)
• Ultra-low output ripple: <5 mV peak-to-peak (<0.001% of full-scale), enabling high-resolution pulse-height analysis in spectroscopic systems
• Short-term stability: ±0.001% per hour; long-term drift <0.01% over 1,000 hours (under constant thermal conditions)
• Temperature coefficient: 10 ppm/°C — calibrated for minimal gain shift across ambient operating ranges (0–45 °C)
• Integrated arc and short-circuit protection with automatic recovery, preventing damage during detector breakdown or cable fault events
• PCB-mountable footprint (50.8 × 25.4 × 12.7 mm) with through-hole or surface-mount compatible pin layout
• External control interface: analog voltage (0–10 V) or potentiometer-based output regulation, supporting closed-loop feedback in automated systems
• Compliant with IEC 61000-6-3 (EMC emission limits) and IEC 61000-6-2 (immunity requirements) when installed per datasheet layout guidelines

Sample Compatibility & Compliance

The MG module is routinely deployed in radiation measurement platforms requiring stable, low-noise HV bias for gas-filled and solid-state detectors. It interfaces seamlessly with standard NIM, CAMAC, and custom digital acquisition systems used in environmental monitoring networks, nuclear education labs, and field-deployable dosimetry units. While not itself a radiation detector, the MG serves as a certified subsystem within FDA-registered radiation safety instruments and ISO/IEC 17025-accredited calibration facilities — provided final system-level validation meets ANSI N42.33 (portable radiation detection instrumentation) and IEC 62327 (handheld X-ray fluorescence analyzers). Its design supports GLP-compliant traceability when integrated with audit-trail-capable control software and calibrated reference loads.

Software & Data Management

As a hardware-only module, the MG does not include embedded firmware or onboard communication interfaces. However, its analog control input enables direct integration with host systems using LabVIEW, Python (via DAQ cards), or industrial PLCs for remote voltage programming and health monitoring. When paired with Wisman’s optional HV monitor board (sold separately), real-time voltage/current telemetry can be logged at 10 Hz resolution and exported in CSV or HDF5 format — fully compatible with LIMS platforms supporting ASTM E2914 or ISO/IEC 17025 data integrity requirements. All calibration certificates issued for OEM-integrated MG modules include metrological traceability to NIST SRM standards.

Applications

• Bias supply for portable gamma spectrometers utilizing NaI(Tl) or LaBr₃(Ce) scintillators
• High-voltage source for miniature proportional counters in airborne radon monitoring systems
• Dynode chain powering in compact PMT-based beta particle detectors for environmental water assay
• Electrostatic lens biasing in miniaturized alpha spectrometry setups
• OEM integration into handheld XRF analyzers, neutron coincidence counters, and UAV-mounted radiation mapping payloads
• Lab-scale electron beam focusing in low-energy SEM prototypes and ion mobility spectrometers

FAQ

Is the MG module compliant with medical device regulations?
The MG module itself is not an IVD or Class II medical device, but it may be incorporated into FDA 510(k)-cleared or CE-marked radiation safety equipment when validated as part of the final system.
Can multiple MG modules be synchronized for multi-channel detector arrays?
Yes — via shared analog control voltage and ground-referenced enable lines; phase synchronization is unnecessary due to DC output nature.
What is the recommended minimum load current to ensure regulation stability?
Operation down to 1 µA is supported; however, optimal stability is achieved at ≥10 µA load, per Wisman Application Note AN-MG-02.
Does Wisman provide test reports for radiated emissions?
Yes — full EMC test reports per CISPR 32 and EN 55032 are available under NDA for qualified OEM partners.
Is conformal coating available for enhanced humidity resistance?
Standard units are uncoated; IPC-CC-830B-compliant acrylic conformal coating is offered as a build-option for extended outdoor deployment.