Rosenfell Detector - Agilent Technologies 8564EC Service Manual

3. Check that HODD (U408 pin 5) is a square wave with a period of
4. Check LPOS_RST (U422 pin 4) for 200 ns low-going pulses every
5. Check LNEG_RST (A3U422 pin 12) for 200 ns low-going pulses
6. Set the detector mode to NORMAL and check that LNEG_RST
7. Check HMUX_SEL0 (A3U408 pin 3) and HMUX_SEL1 (A3U408 pin
Table 8-7 HMUX_SELO/1 versus Detector Mode
NORMAL
SAMPLE
POS PEAK
NEG PEAK

Rosenfell Detector

Refer to function block S of A3 Interface Assembly Schematic Diagram
(sheet 4 of 6) in the 8560 E-Series Spectrum Analyzer Component Level
Information.
If both HPOS_HLDNG and HNEG_HLDNG are high during the same
bucket, HROSENFELL will also be set high. This indicates that the
video signal probably consists of noise, since it rose and fell during the
same period. The HROSENFELL signal is valid only when the
NORMAL (rosenfell) detector mode is selected.
1. Remove anything connected to the
2. Check LPOS_RST and LNEG_RST as described in
Chapter 8
16.7 ms (2 × sweep time/600).
128 µs.
every 128 µs.
(A3U422 pin 12) has two pulses spaced 40 µs apart and then a single
pulse approximately 88 µs from the second pulse.
9) according to Table
Detector Mode HMUX_SEL0
(U408 pin 3)
15 µs pulse every
128 µs
H
H
L
INPUT 50Ω connector. Press
set the controls as follows:
Center frequency ..................................................... 300 MHz
Span ................................................................................. 0 Hz
Sweep time .......................................................................... 5 s
Detector mode ......................................................... NORMAL
Reset" on page 398
8-7.
HMUX_SEL1
(U408 pin 9)
40 µs pulse every
128 µs
H
L
H
8564EC
on the spectrum analyzer and
PRESET
ADC/Interface Section
A3 Assembly Video Circuits
or 8565EC front-panel
"Peak Detector
399