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
Oscilloscope Core Performance
• 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.
