Fluke PM 3394A 4 Channel 200 MHz 200 MS/s Autoranging Combiscope

The Fluke PM 3394A is a four-channel combiscope that unifies analog real-time and digital storage oscilloscope functionality in a single instrument. It delivers 200 MHz bandwidth with 200 MS/s real-time sampling, achieving equivalent sample rates of 25 GS/s through advanced interpolation. Autoranging attenuators and timebase settings optimize display instantly, while extensive triggering options - including TV, pattern, state, and glitch detection down to 2 ns - capture elusive signal events.

The 8 Kpts per channel acquisition memory (expandable to 32 Kpts) stores over 200 waveform traces for detailed post-acquisition analysis.

Technical Specifications

• Bandwidth: 200 MHz


• Channels: 4


• Real-Time Sampling Rate: 200 MS/s


• Equivalent Sample Rate: 25 GS/s


• Acquisition Memory: 8 Kpts per channel, expandable to 32 Kpts


• Waveform Storage: Over 200 traces (204 with optional memory extension)


• Peak Detection: Glitches as narrow as 5 ns


• Trigger Delay & Pre/Post-Triggering: Available


• Vertical Resolution: 8 bits standard; up to 16 bits with averaging


• Magnification: Up to 625 ns/div with 32× magnification


• Power Supply: 100–240 V AC, 50/60 Hz


• Dimensions: 325 mm × 142 mm × 470 mm


• Weight: 8 kg

Key Features

• Extensive triggering: TV (including HDTV and line selection), logic, pattern, state, and glitch modes with hold-off


• Cursor measurements with 1% accuracy across time, voltage, and manual modes


• Probe-operated "Touch Hold and Measure" for instant frequency, amplitude, and DC voltage display


• Standard measurements: voltage, time, frequency, period, rise/fall time, duty cycle, phase


• Waveform math: Add, Subtract, Multiply, Divide (optional MATH+ adds Integration, Differentiation, Histogramming, FFT)


• Signal processing: Averaging, digital low-pass filtering, sine interpolation


• Autoset function for immediate optimized display


• Real-time clock and autocal for automatic circuit fine-tuning


• Closed-case calibration for maintenance efficiency

Interfaces & Connectivity

• EIA-232-D serial interface (standard)


• Optional GPIB/IEEE-488 (IEEE-488.2 with SCPI)


• RS-232, GPIB, and Centronics connectivity

Typical Applications Troubleshooting, production testing, and design verification across complex signal environments requiring dual-mode acquisition and precise temporal analysis.