1. GENERAL INFORMATION User Manual
CNT-90/91/91R/91RAF/90XL
About this Manual
This manual contains directions for use that apply to the Timer/Counter/Analyzers CNT-90 and CNT-91 as well as the
Frequency Calibrator/Analyzer CNT-91R and CNT-91R/AF and the Microwave Counter/Analyzer CNT-90XL.
In order to simplify the references, these instruments are further referred to throughout this manual as the ‘9X’,
whenever the information applies to all types. Differences are clearly marked.
Examples:
CNT-90 means CNT-90 and CNT-90/XL
CNT-90/91 means CNT-90 and CNT-91
CNT-91(R) means CNT-91, CNT-91R and CNT-91R/AF
Chapter 8, Specifications is divided into four separate sections to increase legibility. Much of the contents is common,
so redundant data is the price in this case.
Warranty
The Warranty Statement is part of the folder Important Information that is included with the shipment.
Declaration of Conformity
The complete text with formal statements concerning product identification, manufacturer and standards used for type
testing is available on request.
2. Chapter 1: Preparation for Use
2.1. Preface
2.1.1. Introduction
Congratulations on your choice of instrument. It will serve you well and stay ahead of most competition for many years
to come, whether in bench-top or rack system use. It gives significantly increased performance compared to traditional
Timer/Counters. The ‘9X’ offers the following advantages:
12 digits of frequency resolution per second and 50 or 100 ps resolution, as a result of high-resolution
interpolating reciprocal counting.
A high measurement rate of up to 250k readings/s to internal memory.
Optional oven-controlled timebase oscillators, except the CNT-91R & CNT-91R/AF, which have an ultra-
stable rubidium oscillator.
CNT-90, CNT-91(R): A variety of RF prescaler options with upper frequency limits ranging from 3 GHz to 20
GHz.
CNT-91R/AF: Special version of CNT-91R with selected Rubidium oscillator, plus 5 Reference frequency
outputs covering 100 kHz, 1 MHz, 5 MHz, and 10 MHz. Model CNT-91R/AF has a 3 GHz input C and
CNT-91R/AF/20G has a 20 GHz input C as standard
CNT-90XL: A number of microwave inputs with upper frequency limits ranging from 27 to 60 GHz.
CNT-90(XL): Optional Pulsed RF for RF pulse characterization up to 60 GHz carrier frequency and down to
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