Absolute Amplitude Accuracy - Keysight M9290A Manual

Description

Absolute Amplitude Accuracy

a
At 50 MHz
20 to 30C
0 to 55C
a
At all frequencies
20 to 30C
0 to 55C
95th Percentile Absolute
b
Amplitude Accuracy
(Wide range of signal levels,
RBWs, RLs, etc.,
Atten = 10 dB)
100 kHz to 3.0 GHz
c
Preamp On
At 50 MHz
At all frequencies
a.
Absolute amplitude accuracy is the total of all amplitude measurement errors, and applies over the following
subset of settings and conditions: 1 Hz  RBW 1 MHz; Input signal 10 to 50 dBm; Input attenuation 10
dB; span < 5 MHz (nominal additional error for span  5 MHz is 0.02 dB); all settings auto-coupled except
Swp Time Rules = Accuracy; combinations of low signal level and wide RBW use VBW 30 kHz to reduce
noise.
This absolute amplitude accuracy specification includes the sum of the following individual specifications
under the conditions listed above: Scale Fidelity, Reference Level Accuracy, Display Scale Switching
Uncertainty, Resolution Bandwidth Switching Uncertainty, 50 MHz Amplitude Reference Accuracy, and the
accuracy with which the instrument aligns its internal gains to the 50 MHz Amplitude Reference.
b.
Absolute Amplitude Accuracy for a wide range of signal and measurement settings, covers the 95th percentile
proportion with 95% confidence. Here are the details of what is covered and how the computation is made:
The wide range of conditions of RBW, signal level, VBW, reference level and display scale are discussed in
footnote a. There are 108 quasi-random combinations used, tested at a 50 MHz signal frequency. We compute the
95th percentile proportion with 95% confidence for this set observed over a statistically significant number of
instruments. Also, the frequency response relative to the 50 MHz response is characterized by varying the signal
across a large number of quasi-random verification frequencies that are chosen to not correspond with the
frequency response adjustment frequencies. We again compute the 95th percentile proportion with 95%
confidence for this set observed over a statistically significant number of instruments. We also compute the 95th
percentile accuracy of tracing the calibration of the 50 MHz absolute amplitude accuracy to a national standards
organization. We also compute the 95th percentile accuracy of tracing the calibration of the relative frequency
response to a national standards organization. We take the root-sum-square of these four independent Gaussian
parameters. To that rss we add the environmental effects of temperature variations across the 20 to 30°C range.
Same settings as footnote a, except that the signal level at the preamp input is 40 to 80 dBm. Total power at
c.
preamp (dBm) = total power at input (dBm) minus input attenuation (dB). This specification applies for signal
frequencies above 100 kHz.
24
Specifications
0.40 dB
0.45 dB
(0.40 dB + frequency response)
(0.45 dB + frequency response)
Supplemental Information
0.34 dB (95th percentile)
0.22 dB (Typical)
0.60 dB
0.36 dB (95th percentile)
(0.36 dB + frequency response)
(95th percentile)