Fluke PM6681R/676 - 300 MHz Rubidium Timer/Counter/Analyzer

• Calibrates frequency, time intervals and phase
• 11 digits per second measuring speed
• 50 ps single-shot time interval resolution
• Down to 2 ps averaged time interval resolution
• 8k readings/s to internal memory with 50 ps resolution
• Repetitive sampling rate up to 10 M/s
• High trigger level resolution 1.25 mV
• Very low systematic time error 500 ps
• High phase accuracy to 0.02º
• TimeView PC software including frequency-vs-time, FFT
• Five 10 MHz reference outputs and one 5 MHz output

The Rubidium reference of the PM 6681R makes this instrument the most accurate frequency reference/counter/calibrator for the calibration of frequency, time or phase.

• High accuracy and short warm-up times:
• Calibrates frequency, time or phase
• Calibrates any application specific frequency
• 5 x 10 MHz and 1 x 5 MHz buffered reference output
• 5 year warranty on Rubidium element

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PM 6681R Rubidium Counter/Calibrator

The PM6681R is based on the PM6681, yet is equipped with a Rubidium stablized timebase. The full specification for the PM6681 applies, with the following spcifics for the Rubidium timebase. Frequency Stability Specifications * Aging Per Month: 5E-11 (After 1 month of continuous operation) Per Year: 5E-10 (First Year)   2E-10 (After First Year) Short Term Allan Variance of Reference Oscillator: 1s: 1E-10   10s: 3E-11   100s: 1E-11 Temperature Dependency 0 to 50ºC: 3E-10 1 day stability at 25 ± 3ºC: 4E-11 after 7 days continuous operation Warm up time (at 25ºC) Unlock status indicated by LED   Time to lock: 4 minutes Time to reach 1E-9: 6 minutes Retrace: 5E-11   Retrace is the relative frequency deviation after 1 hour operation, compared with the previous value, before a switch off period of 24 hours. Power Requirements (at 25ºC) Voltage 90 to 264 Vrms, 47 to 440 Hz Power Rating: < 100 W for < 4 minutes, < 50 W continuous operation (at 25ºC) Reference Outputs   5 additional 10 MHz reference outputs are available at the rear of the counter Output Level: 0.5 V rms into 50Ω load Wave Shape: Sine Mechanical Data Weight: Net is 4.8 kg (10 lb)   Shipping is 7.8 kg (16.8 lb)