Agilent Technologies Ininiium 90000 Specifikace stáhnout pdf (Strana 42)

Chapter 3: 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 time base calibration, whether performed by at the

factory, by a customer, or by an Agilent service center. The aging component scales linearly from

the time since the last time base 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 Calibration)) ppm peak

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 E8267D 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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