Performance Verification for Analog Analyzer
3
Keysight U8903B Service Guide
53
DFD verification
This test verifies the DFD performance of the U8903B is within the published specification
using an internal loopback connection.
1
Preset the U8903B audio analyzer. Configure the U8903B generator output channel 1
and 2 to connect to all of its own analyzer input channels (up to 8 channels
concurrently) through internal loopback.
2
Configure the U8903B generator output channels as follows:
– Connection type: Unbalanced
– Output impedance: 600
Ω
– Output grounding configuration: Floating ground
– Waveform: DFD IEC268
– Level summation: Linear
– Output state: ON
3
Configure the U8903B analyzer input channels to be tested as follows:
– Connection type: Loopback
– Input bandwidth: 90 kHz
– Input coupling: DC
– Voltage detector type: RMS
– Trigger source: Immediate
– Measurement function2: DFD IEC 60268 2nd order
– Sample size: 131072
4
On the U8903B generator output channels, set the difference frequency to 80 Hz. Set
the center frequency of f
DUT
and the amplitude of Vrms as given in “
.
5
On the U8903B analyzer input channels, set the input range as given in “
Table 3-9
DFD specification
DFD specification (at 1 Vrms)
Equipment used
≤
–106 dB
U8903B (internal loopback)
NOTE
Power on the U8903B audio analyzer for at least 30 minutes before performing the
performance verification.
Содержание U8903B
Страница 1: ...Keysight U8903B Performance Audio Analyzer Service Guide ...
Страница 12: ...12 Keysight U8903B User s Guide THIS PAGE HAS BEEN INTENTIONALLY LEFT BLANK ...
Страница 126: ...A Appendix A 126 Keysight U8903B Service Guide THIS PAGE HAS BEEN INTENTIONALLY LEFT BLANK ...
Страница 160: ...B Appendix B 160 Keysight U8903B Service Guide THIS PAGE HAS BEEN INTENTIONALLY LEFT BLANK ...
Страница 161: ...Keysight U8903B Audio Analyzer Service Guide Appendix C Modify a Cable for the U8903B CMRR test 162 ...
Страница 164: ...C Appendix C 164 Keysight U8903B Service Guide THIS PAGE HAS BEEN INTENTIONALLY LEFT BLANK ...