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Fluke PM6681R/876 - 300 MHz Rubidium Timer/Counter/Analyzer

Fluke PM6681R/876 - 300 MHz Rubidium Timer/Counter/Analyzer

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300 MHz Rubidium Timer/Counter/Analyzer including:

  • GPIB-Interface (PM 9626/00)
  • TimeView Time & Frequency Analysis Software for DOS

The highest performance timer/counter/analyzer available

The PM 6681R sets the new standard for measurement and analysis of time intervals, frequency, phase and jitter. For development, calibration, or challenging production test applications, the PM 6681R is the leader.

  • 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
Calibration Instruments   >   Time and Frequency Instruments   >  
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 *
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 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)
Voltage90 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)

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