Agilent Technologies 8590 Series Service Manual page 564

Softkey Descriptions
Softkey Descriptions
CAL AMPTD Calibrate Amplitude
D Note that if both
ESCRIPTION
self-calibration routines are required, perform the
FREQ
The
CAL AMPTD
self-calibration routine. Connect CAL OUT to the
analyzer input before pressing
During the
messages are sequentially displayed, indicating a
specific calibration activity. Each calibration performed
by
CAL AMPTD
• While CAL: AMPTD is displayed, the following
calibrations are performed:
564
CAL FREQ
routine first.
softkey initiates an amplitude
self-calibration routine,
CAL AMPTD
is described below.
The amplitude error of each resolution bandwidth
is corrected using the 3 kHz resolution bandwidth
is the amplitude reference. Each amplitude error
is then stored as a calibration factor.
The center frequency error of each bandwidth is
corrected.
The top-screen reference level is calibrated using
the amplitude of the
reference.
1. The amplitude of the detected 21.4 MHz IF
signal is measured on the A16 processor/video
assembly.
2. The Reference-Level-Calibration DAC on the
A7 analog interface assembly adjusts the gain
of the IF Calibration Amplifier on the A9
Third Converter assembly to correct the
amplitude measured on the A16 assembly.
3. After the A7 DAC adjusts the A9 output, fine
amplitude corrections are made with a digital
offset of the video signal on the A16 assembly.
4. The A7 DAC value and video offset are stored
as correction factors on the A16 assembly.
and
CAL AMPTD
.
CAL AMPTD
signal as a
CAL OUT
Chapter 13
CAL