Agilent Technologies 8590 Series Service Manual page 565

• While CAL: 3dB BW is displayed, the following
calibrations are performed:
• While CAL: ATTEN is displayed, the following
calibrations are performed:
Chapter 13
The 3 dB and 6 dB EMI resolution bandwidths
are measured.
DACs on the A7 analog interface assembly adjust
the bandwidth of the LC and crystal filters on the
A11 and A13 Bandwidth Filter assemblies.
The DAC bandwidth correction factors are stored
on the A16 processor/video assembly.
The amplitude error of the 10 dB step gains on
the A12 amplitude control assembly and the
10 dB linear gains on the A14 Log
Amplifier/Detector assembly are corrected.
The 10 dB step gain on the A12 assembly is
the amplitude reference.
Step-gain and linear-gain errors are corrected
with digital offsets of the video signal on the
A16 assembly.
The video offsets are stored as correction
factors.
Amplitude errors for the A3 Input Attenuator are
corrected.
The 10 dB step attenuator is the amplitude
reference.
Input attenuator errors are corrected with
digital offsets of the video signal on the A16
assembly.
The attenuator offsets are stored as correction
factors.
Softkey Descriptions
Softkey Descriptions
565