Keysight NFA Series User Manual

12 Chapter 2
Test Descriptions
10 MHz Out Frequency Reference Accuracy
10 MHz Out Frequency Reference Accuracy
Test Description
The test applies to NFAs with either the standard 10 MHz frequency
reference or 10 MHz precision frequency reference (Option 1D5).
The test measures both the frequency reference accuracy and the ability
to set the timebase. The frequency reference accuracy is measured with
the NFA’s 10 MHz REF OUT connected to the frequency counter's
Channel A input. A cesium beam frequency standard, or some other
10 MHz ± “house standard” provides the frequency reference for the
frequency counter. The timebase to be set is measured by changing the
setting of the digital-to-analog converter (DAC) which controls the
frequency of the timebase. The frequency difference over the range of
DAC settings is calculated and compared to the specification.
Test Specification
Related Adjustment
10 MHz Frequency Reference Adjustment (see page 18).
Standard Option 1D5
Ageing Rate < ±2 ppm/year < ±1 ppm/year
Settability < ±0.5 ppm < ±0.01 ppm
Temperature Stability < ±6 ppm < ±0.01 ppm

Keysight NFA Series Specifications

General

Brand	Keysight
Model	NFA Series
Category	Measuring Instruments
Language	English