Agilent Technologies E4406A, Руководство пользователя

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154 Chapter 5
Functional Testing
Input Attenuator Accuracy at 50 MHz
Input Attenuator Accuracy at 50 MHz
Test Limits
The internal input attenuator should reduce the input signal to a value
within
±
1.0 dB of the nominal value at 50 MHz.
Test Description
The input attenuator accuracy test checks the proper function of the
internal attenuator. The attenuation is checked by using the internal
50 MHz calibration signal as a source. The input attenuator of the
instrument is set to various values. The internal 50 MHz calibration
signal source amplitude is constant. The signal amplitude is measured
by the UUT at the 10 dB attenuator setting and recorded as the
reference level. Then the signal amplitude is measured by the UUT at
additional settings and the measured values compared to the reference
level. Because the measured level of the input signal should not vary
with changes in input attenuation, the difference between the reference
value and the other measured values indicates the attenuator accuracy.
Required Equipment
None