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2. Disconnect W26 (coax 2) from
A3JlOl
and connect the output of a function generator to
A3JlOl.
3. Set the function generator to the following settings:
Output
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..Sinewave
Amplitude
. . . . . . . . . . . . . . . . . . . . , . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 V pk-to-pk
DC Offset
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
+500mV
Frequency
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
50Hz
4. Set the spectrum analyzer sweep time to 50 ms.
5. Adjust the function generator amplitude and offset until the sine wave fills the entire
graticule area.
6. Measure and note the function generator peak-to-peak voltage using an oscilloscope.
v(10
dB/div)
=
V
7. Set the spectrum analyzer to 2 dB/div.
8. Readjust the function generator amplitude and offset until the sine wave again fills the
entire graticule area.
9. Measure the function generator peak-to-peak voltage and dc offset.
v(2
dB/div)
=
V
10. The ratio of voltage recorded in step 6 to the voltage recorded in step 9 should be 5
f3%.
If the ratio is not 5, troubleshoot the A3 Interface assembly.
11. Reconnect W26 to
A3JlOl.
Video
MUX
Refer to function block U of A3 Interface Assembly Schematic Diagram in the
HP 8560 E-Series Spectrum Analyzer Component Level Information.
1. Press
[-ET)
and set the spectrum analyzer controls as follows:
Center frequency
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
..300MHz
Span
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . OHz
2. Press
[mSWP),
(CAL), and IF
&DJ
OFF.
Connect the CAL OUTPUT to the INPUT
50R
connector.
3. Check for a TTL high on A3U104 pin 2 and a TTL low on
U104
pin 10. Set the spectrum
analyzer to 2 dB/div and check for a TTL high on A3U104 pin 10 and a TTL low on
A3U104 pin 2.
4. If the logic levels on A3U104 are incorrect, check the LLOG-STB signal
as
follows:
a. Monitor A3U104 pin 9 with an oscilloscope or logic probe. Check that a 1
microsecond, low-going pulse is present when switching between 10 dB/div and
2 dB/div.
b. Check the inputs to A3U104 (pins 3 and 11) while switching between 10 dB/div and
2 dB/div.
8-16
ADC/lnterface
Section