Service Guide N5242-90001
5-11
PNA Series Microwave Network Analyzers
Theory of Operation
N5241A/42A
Synthesized Source Group Operation
with an external test set. This output is terminated with a 50-ohm load on the A8 26.5 GHz
source.
The companion signal, EXT TEST SET DRIVE LO, is output from the A23 mixer brick.
Refer to
“A23 and A24 Mixer Bricks” on page 5-21
A21 Multiplier/Amplifier 26.5 Board (HMA26.5)
In bands 2–28, the synthesized LO input is filtered, amplified, and passed through to the
A22 splitter (4-port only). In bands 29–36, the input is amplified, doubled, and filtered,
then sent to the output.
Together, these signal paths create the full output frequency range of 12.5 MHz to
26.508 GHz that is sent to the A22 splitter (4-port only) where the signal is divided and
sent to the A23 and A24 (4-port only) mixer bricks as the LO signal.
A10 Frequency Reference Board
This assembly provides stable reference frequencies to the rest of the instrument. A high
stability 10 MHz oven-controlled crystal oscillator (OCXO) normally provides the
frequency standard. However, if a 10 MHz external reference signal is detected at the
10 MHz EXT REF IN port on the rear panel, it is used as the frequency reference instead.
The 10 MHz reference signal is used to phase lock a 100 MHz VCO. The output of this VCO
is then divided by ten to produce the 10 MHz EXT REF OUT rear panel signal and also a
10 MHz reference signal for the A12 signal processing ADC module (SPAM) board. The
VCO output is also divided by two to produce 50 MHz reference signals for the A4, A13,
and A11 13.5 GHz synthesizer boards.
Rear-Panel Interconnects
10 MHz REF INPUT
A BNC connector that allows an external frequency reference
signal to be used to phase lock the analyzer for increased
frequency accuracy.
The analyzer automatically enables the external frequency
reference feature when a signal is connected to this input. When
the signal is removed, the analyzer automatically switches back to
its internal frequency reference.
10 MHz REF OUTPUT
A BNC connector that allows a 10 MHz reference signal, produced
by the A10 frequency reference board, to be output for use in
phase locking external test equipment.
Содержание N5241A
Страница 11: ...Service Guide N5242 90001 1 1 1 Safety and Regulatory Information...
Страница 19: ...Service Guide N5242 90001 2 1 2 General Product Information...
Страница 35: ...Service Guide N5242 90001 3 1 3 Tests and Adjustments...
Страница 81: ...Service Guide N5242 90001 4 1 4 Troubleshooting...
Страница 125: ...Service Guide N5242 90001 5 1 5 Theory of Operation...
Страница 159: ...Service Guide N5242 90001 6 1 6 Replaceable Parts...
Страница 243: ...Service Guide N5242 90001 7 1 7 Repair and Replacement Procedures...
Страница 313: ...Service Guide N5242 90001 8 1 8 General Purpose Maintenance Procedures...
Страница 354: ...Index 22 Service Guide N5242 90001 Index...