Spectracom Logo Spectracom CNT91 91R Timer Counter Analyzer Calibrator

Spectracom CNT91/91R Timer/Counter/Analyser/Calibrator

Frequency Analysers/Counters


Pendulum CNT-91 Timer/Counter/Analyser is the highest performance counter for measurement, analysis and calibration of frequency, time interval and phase. The CNT-91 is very suitable for production test systems, for R&D, in calibration labs, or in the field. The CNT-91R is basically a combination of the high resolution CNT-91 and a Rubidium Frequency Standard, all in one box.

  • 250,000 meas/sec to internal 3.5M total result memory
  • Zero dead-time
  • Up to 15,000 meas/sec over GPIB and USB
  • 50 ps single-shot time interval resolution
  • 12 digits/sec frequency resolution
  • Continuous data streaming during, not after, measurements
  • Up to 20 GHz range, burst measurements down to 20 ns
  • Graphic display of jitter, histograms, trend and modulation
  • Modulation domain analysis to 20 GHz with TimeView SW


Ultrahigh speed and resolution The CNT-91 Frequency Timer/Counter/Analyser, is the highest performance counter for measurement, analysis and calibration of frequency, time interval and phase. In production test systems, R&D, calibration lab, or in the field; the CNT-91 outperforms any counter on the market for speed, resolution, statistical analysis and processing capabilities. The CNT-91 provides high 50 ps single shot time resolution or 12 digits/sec frequency resolution for capturing very small time and frequency changes. And, displays up to 14 digits on values obtained. The CNT-91 Timer/Counter/Analyser also processes an exceptionally fast 250,000 measurements/sec to internal memory with a maximum of 3.5M measurements stored. Graphic Display and Multi-mode Presentation Pendulum frequency counters supports unique graphic presentation of results including histograms, trend lines, and modulation. On-screen statistical processing of random signal distribution and measurement changes vs. time, from slow drift, to fast jitter and modulation. Complete analysis including mean, min., max. p-p, standard deviation, and Allan deviation are viewable in both graphic and numeric format. With TimeView, Modulation Domain Analyser software (optional), the CNT-91 statistical processing is more powerful and provides expanded analysis capabilities. Zero Dead-Time Captures Individual Periods Unlike standard gated frequency counters, the CNT-91 provides continuous time-stamping of events capturing all individual periods, back-to-back without dead-time, measuring every complete event cycle without event interpolation errors. This process allows for a least-squares linear regression of multiple measurements, adding 3 or more digits to the measurement resolution. Microwave Frequency Range and Time Base The CNT-91 features a frequency range of 0.001Hz to 400 MHz standard with options to 3, 8, 14 and 20 GHz. Two OCXO options are available: one with very high stability (0.01 ppm/month), and one with an ultra-high stability (0.003 ppm/month). GPIB/USB Increased Throughput and Efficiency USB and GPIB (IEEE 488.2) interfaces are standard with the CNT-91. The GPIB interface is SCPI/1999 compliant and includes a HP53131A emulation mode for easy inclusion in test systems designed for older model counters. This eliminates the need to re-program system commands when replacing older counters with the modern CNT-91. With a fast bus transfer speed of 2,600 individual measurement results/sec via GPIB or USB, the CNT-91 saves test system time and money by increasing throughput, up to 90%. CNT-91R Frequency Calibrator/Analyser The CNT-91R Frequency Calibrator/Analyser is an all-inclusive high performance calibrator of frequency sources, that combines high resolution measurements and advanced analysis, and a built-in ultra-stable Rubidium atomic reference clock. Its compact format, and its short warm-up time, makes the CNT-91R an ideal transportable frequency calibrator/analyser. The new CNT-91R is the first instrument in the Pendulum CNT-90-family that includes a built in ultra-stable atomic clock. The CNT-91R is basically a combination of the ultra-high resolution CNT-91 and a Rubidium Frequency Standard, all in one box.


Find out more information about the Spectracom CNT91/91R Timer/Counter/Analyser/Calibrator here


Datasheet CNT-91-91R Timer Counter Analyser Calibrator Datasheet Application Notes & White Papers Improvement of frequency resolution using PicoTime along with CNT-91 Application Note ABCs of Modulation Domain Analysis Application Note Continuous Measurements with Zero Dead-Time in CNT-91 White Paper Start-up Measurements on Oscillators White Paper Time & Frequency Measurements for Oscillator Manufacturers using CNT-91 White Paper CNT-90 Series and Agilent 53131A-132A Compatibility Certificates EC Declaration of Conformity Manuals Operating Manual Programming Guide