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Pendulum CNT-91 Advanced Frequency & Time Interval Analyzer

Pendulum CNT-91 Advanced Frequency & Time Interval Analyzer

Price on request

  • Highest performance counter
  • 50 ps single-shot time interval resolution
  • Zero dead-time
  • Continuous data streaming during, not after, measurements
  • Up to 20 GHz range, burst measurements down to 20 ns
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Pendulum CNT-91 Advanced Frequency & Time Interval Analyzer


The Pendulum CNT-91 Frequency Timer/Counter/Analyzer, 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.

Ultra high Speed and Resolution ​

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/Analyzer 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 support a 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 formats.

With TimeView, Modulation Domain Analyzer software (optional), the CNT-91 statistical processing is more powerful and provides expanded analysis capabilities.

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).

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.

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 an 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%.


For more information: Pendulum

Pendulum CNT-91 Advanced Frequency & Time Interval Analyzer

Pendulum CNT-91 + CNT-91r Datasheet

Additional information




Analyzers, Frequency Counters

Frequency Range

400 MHz, 3 GHz, 8 GHz, 15 GHz, 20 GHz

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