Pendulum Instruments, with its roots in Philips T&M, has over 50 years of experience in developing technology-leading solutions for precise time & frequency measurement, calibration and analysis.
Frequency Timer/Counter/Analyzers
Frequency Timer/Counter Analyzers are characterized by the unique graphic UI showing high-accuracy numeric results plus graphic trends, modulation, histograms and statistical parameters. The fast measurements, the very high resolution and the TimeView analysis SW makes the instruments complete Frequency & Modulation Domain Analyzers.
The modern measurement technique is based on fast continuous time-stamping that enables gap-free zero dead-time measurements.
The range consists of 4 instruments:
CNT-90: Basic model, 70 ps resolution/time-stamp
CNT-91: Enhanced model 35 ps resolution
CNT-91R: A CNT-91 with integrated Rubidium oscillator
CNT-90XL: A CNT-90 plus an additional microwave mixer input
- UI: Graphical w trends, modulation, histograms display
- Speed: 250000 measurements/s
- Frequency resolution: 12 digits/s
- Time resolution: 35/70 ps/time stamp
- Frequency range CNT-90/91: 400 MHz (up to 20 GHz opt.)
- Frequency range CNT-90XL: 27/40/46/60 GHz
- Zero-dead-time measurements: CNT-91
- Continuous gap-free data streaming: CNT-91
- Built-in Rubidium atomic clock: CNT-91R
- Battery option: CNT-90 & CNT-90XL
- Pulsed RF option: CNT-90XL (down to 30ns pulses, up to 60 GHz)

TimeView Modulation Domain Analysis
The combination of a CNT-9x Counter/Analyzer, as a fast sampling front-end, and the TimeView SW makes a full-blown Modulation Domain Analyzer, MDA.
An MDA displays Frequency variation over time (Modulation Domain), similar to an oscilloscope that displays Voltage variation over time. It is a great complement to the oscilloscope (Time domain) and Spectrum Analyzer (Frequency domain) for in-depth signal analysis.
The example below show the display of a 2-level FSK signal on an oscilloscope (carrier shape), spectrum analyzer (frequency components) and TimeView (modulating signal shape).


TimeView exists in two versions.
- TimeView 2, which can use any of the CNT-9x models as frontend
- TimeView 3, with enhanced functionality, which can only use CNT-91(R)
- View dynamic frequency changes over time
- View residual FM on up to 60 GHz carriers
- Follow frequency changes every 4 us in real time (every 10 ns with repetitive sampling)
- Analyze VCO settling, PLL responses and more
- Analyze oscillators; power-on stability, short-term (ADEV) and long-term stability
- Analyze frequency hopping, chirp radar, frequency droop to 20 GHz
- Powerful analysis: FFT, Statistics (histogram), smoothing, ADEV and MADEV vs t
- Zero dead-time (gap-free) measurements, detect phase shifts
Contact Testhouse Nordic for more information and prices!
E-mail: sales@testhouse.se
Or call: +46 8 5012 60 50 (SWE) , +358 40 744 3082 (FIN)
Frequency Analysis from Pendulum
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