HP 8753E User Manual page 47

EXTERNAL BEF'ElUINCE INPUT. connector. This allows for a frequency reference signal
input that can phase lock the 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.
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signal source, such 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, as described in the service manual.)
EXTERNAL AM connector. This allows for an external analog signal input that is
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applied to the ALC circuitry of the analyzer's source. This input analog signal amplitude
modulates the RF output signal.
EXTERNAL TRIGGER connector. This allows connection of an external negative-going
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external through softkey functions.
TEST SEQUENCE. This outputs a 'ITL signal that can be programmed in a test sequence
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to be high or low, or pulse (10 pseconds) high or low at the end of a sweep for robotic part
handler interface.
15. LIMIT TEST. This outputs a TI'L signal of the limit test results as follows:
n Pass: TTLhigh
Fail: ITLlow
n
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TEST SET INTEECONNECC. This allows you to connect an HP 8763E Option 011
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analyzer to an HP 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.
BIAS INPUTS AND FUSES. These connectors bias devices connected to port 1 and
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port 2. The fuses (1 A, 125 V) protect the port 1 and port 2 bias lines
Serial number plate. The serial number of the instrument is located on this plate.
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EXTERNAL MONITOB: VGA. VGA output connector provides analog red, green, and blue
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video signals which can drive a VGA monitor.