Fluke PM 3390B Autoranging CombiScope, 200 MHz, 2-Channel

The Fluke PM 3390B Autoranging CombiScope integrates oscilloscope and multimeter functionality in a single benchtop instrument, enabling comprehensive waveform analysis and precision digital measurements for electronics testing and signal troubleshooting. Its dual-mode operation - switchable between analog and digital storage oscilloscope (DSO) modes - adapts to diverse signal conditions without manual reconfiguration.

Technical Specifications

• Bandwidth: 200 MHz


• Analog channels: 2


• Real-time sampling: 200 MS/s (single channel), 100 MS/s (dual channel)


• Equivalent sample rate (random sampling): Up to 25 GS/s


• Repetitive signal sampling: Up to 25 GS/s


• Maximum memory depth: 0.032 Mpts, expandable to 32K samples per trace


• ADC resolution: 8-bit; enhanced to 16-bit via memory processing and averaging


• Vertical sensitivity: 50 mV/div minimum, magnifiable up to 32x


• Input impedance: 1 MΩ ± 1% // 25 pF ± 2 pF; selectable 50 Ω ± 1% on PM 339xB models


• Maximum input voltage: ±150 VRMS CAT II (1 MΩ); ±5 V DC / 5 V RMS / ±50 V AC peak (50 Ω)


• Bandwidth limiter: 20 MHz @ -3 dB Timebase & Acquisition


• Main timebase: 0.5 s/div to 20 ns/div (1-2-5 sequence)


• Delayed timebase: 0.5 ms/div to 20 ns/div (1-2-5 sequence)


• Fastest sweep: 2 ns/div (with 10x magnification on PM 339xB)


• Continuously variable timebase down to 1 µs/div in DSO and analog modes Triggering & Analysis


• Edge, auto, and triggered modes


• TV triggering with HDTV tri-level-sync support


• Pattern/state triggering


• Glitch detection to 5 ns


• Sine interpolation (up to 40 MHz, single channel); linear interpolation (up to 20 MHz, single channel)


• User-selectable averaging: 2 to 4096x factors, achieving up to 14-bit resolution


• Measurement functions: VDC, VRMS, Vpk-pk, frequency, period, rise time, overshoot


• Display: Screen read-out with cursor analysis Integrated Multimeter The CombiScope designation includes multimeter functionality for voltage (AC/DC), current (AC/DC), and resistance measurements.

Key Features

• Single-button mode switching between analog and DSO operation


• Selectable input impedance for flexible measurement scenarios


• Dual-channel simultaneous acquisition


• Enhanced vertical magnification for low-level signal analysis


• Extensive triggering vocabulary for complex waveform capture

Typical Applications

• Power supply and regulator characterization


• Digital circuit timing verification


• Signal integrity and transient analysis


• Multichannel troubleshooting in mixed-signal environments

Compatibility & Integration Benchtop form factor with embedded operating system for standalone operation. Supports both oscilloscope and multimeter measurement protocols within a unified interface.