A16 Rear Panel; Source Theory Overview - HP 8753D Option 011 Service Manual

A16 Rear Panel

The A16 rear panel includes the following interfaces:
TEST SET I/O INTERCONNECT.
analyzer to an P 85046A/B or 85047A S-parameter test set using the interconnect cable
supplied with the test set. The S-parameter test set is then fully controlled by the analyzer.
This interface also provides control signals and power to operate duplexer test adapters.
This allows for a frequency reference signal input that can phase lock the
EXT REF.
analyzer to an external frequency standard 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.
0 MHZ PRECISION REFERENCE. (Option D5)
REF (described above) to improve the frequency accuracy of the analyzer.
This allows for a dc or ac voltage input from an external signal source, such
AUX INPUT.
as a detector or function generator, which you can then measure, using the S-parameter
menu. (You can also use this connector as an analog output in service routines.)
This allows for an external analog signal input that is applied to the ALC
EXT AM.
circuitry of the analyzer's source. This input analog signal amplitude modulates the RF
output signal.
This allows connection of an external negative TTL-compatible signal that will
EXT TRIG.
trigger a measurement sweep. The trigger can be set to external through softkey functions.
This outputs a TTL signal that can be programmed in a test sequence to
TEST SEQ.
be high or low, or pulse (10 seconds) high or low at the end of a sweep for a robotic part
handler interface.
This outputs a TTL signal of the limit test results as follows:
LIMIT TEST.
Pass: TTL high
Fail: TTL low

Source Theory Overview

The source produces a highly stable and accurate RF output signal by phase locking a YIG
oscillator to a harmonic of the synthesized VCO (voltage controlled oscillator). The source
output produces a CW or swept signal between 300 k z and 3 G z (or 30 k z and 6 G z for
Option 006). The source has a maximum leveled power of +20 dBm (or +18 dBm for Option
006) and a minimum power of 5 dBm.
The full frequency range of the source is produced in 14 subsweeps, one in super low band,
two in low band and eleven in high band. The high band frequencies (16 M z to 3 G z)
or (16 M z to 6 G z for Option 006) are achieved by harmonic mixing, with a di erent
harmonic number for each subsweep. The low band frequencies (300 k z to 16 M z) are
down-converted by fundamental mixing. The super low band frequencies (10 k z to 300 k z)
are sent directly from the A12 reference board to the output of the A3 source assembly. This
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This allows you to connect an P 8753D Option 011
This output is connected to the EXT
Theory of Operation 12-9