Agilent Technologies 8590 Series Service Manual page 602

Softkey Descriptions
Softkey Descriptions
MAIN SPAN Main Span
D Displays the main-coil-span signal, MC_SPAN, from
ESCRIPTION
the span dividers on the A7 analog interface assembly.
Perform the following steps to observe MC_SPAN for
the main-coil spans (LO spans greater than 10 MHz).
1. Press
2. Press
3. Adjust the span setting while observing the
displayed ramp. The slope of the ramp increases as
the span increases.
Due to quantization errors, the display appears flat for
LO spans less than 100 MHz.
For FM coil spans (LO spans less than or equal to
10 MHz), the display is a flat line.
Refer to
information.
R S
ELATED OFTKEYS
MIXER BIAS DAC Mixer-Bias DAC
D Note that this function is available for 8592L, 8593E,
ESCRIPTION
8595E, and 8596E spectrum analyzers only.
Displays the output of the mixer-bias DAC from the
first-converter driver on the A7 analog interface
assembly. This DAC provides a bias current for the
high-band mixer in the A3A6 Dual-Band Mixer. The
instrument must be in a single-band sweep for the
display to be valid.
The top four display divisions represent the DAC range
of 0 V to +10 V. A horizontal line, representing the DAC
output voltage, is displayed within the top four
divisions. The DAC voltage should not change within a
frequency band.
Refer to
information.
R S
ELATED OFTKEYS
602
before pressing
SPAN
to display a negative-going ramp.
MAIN SPAN
Chapter 6 for additional LO troubleshooting
FM SPAN
Chapter 6 for additional troubleshooting
CAL MXR
.
CAL
Chapter 13