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Chapter 4: Testing Performance

Time Scale Accuracy (TSA)

This procedure verifies the maximum TSA specification for the oscilloscope.

Description

TSA refers to the absolute accuracy of oscilloscope’s time scale. Because TSA depends directly on

frequency of a crystal oscillator, it is comprised of two components: an initial accuracy component and

an aging component. The initial accuracy component applies to the oscilloscope’s accuracy immediately

after a calibration, whether performed at the factory, by a customer, or by an Agilent service center. The

aging component scales linearly from the time since the last factory calibration and adds to the initial

accuracy component.

Specifications

TSA is published as a warranted specification, expressed by the following formula. The aging

component is specified by the crystal manufacturer while the initial accuracy component represents our

best estimate of the final value, which will be determined from subsequent characterization of a large

sample of production units.

TSA = ±(0.4 + 0.5(Years Since Factory Calibration)) ppm peak

To see the number of years since factory calibration, open the oscilloscope application and navigate to

Utilities -> Calibration in the top menu bar. Inside this dialog box will be a line specifying the Time

Scale Cal Date. This is the date of the last factory calibration.

Note that TSA is specified with respect to an absolute standard and therefore its measurement results

must be compared against test limits that account for the uncertainties in its measurement results. The

total measurement uncertainty of the following test procedure is 0.1 ppm. It is the sum of 0.01 ppm for

the test signal’s absolute frequency accuracy, 0.04 ppm for the voltage noise and phase noise of the

oscilloscope’s digitized waveforms, and 0.05 ppm for the residual settling time of the crystal oscillator

after the specified 30 minute warm-up time. Therefore, all measurement results need to be better than

the specified values by a test margin of at least 0.1 ppm in order to guarantee compliance to the

specification.

Equipment Required

Equipment Critical Specifications Recommended Model/Part

Synthesized sine

wave source

Output Frequency: 10 MHz

Output Amplitude: 0 dBm

Frequency Resolution: 0.1 Hz

Agilent E8257D PSG

10 MHz frequency

reference

Output Frequency: 10 MHz

Output Amplitude: 0 dBm

Absolute Freq. Error: < 0.01 ppm

Symmetricom 58503B

SMA cable 50 ohm characteristic impedance

SMA (m) connectors

Max Frequency:  50 MHz

Agilent 8120-4948

RF cable 50 ohm characteristic impedance

BNC (m) connectors

Max Frequency:  50 MHz

Agilent 8120-1840

Adapters, assorted 3.5 mm (f) to Precision BNC (m) Agilent 54855-67604

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