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The spectrum analyzer outputs must be formatted appropriately for the controller and measurement requirements.
The spectrum analyzer transmits decimal or binary values, via the Hewlett-Packard Interface Bus (HP-IB), to a
controller or other HP-IB device, such as a printer. The decimal and binary values represent trace information or
instructions.
The format characteristics are summarized in the table below.
Analyzer Output
Sends trace information only as a decimal value in Hz,
Sends trace amplitude and position information, or
instruction word as decimal values ranging from P, to
4095:
in display units.
1024 to 2047 are instruction words (analyzer
machine language).
2048 to 3071 represent positive, blanked amplitudes
in display units.
3072 to 4095 represent negative, blanked
amplitudes in display units,
Sends trace amplitude and position information, or
instruction word as binary values in two &bit bytes,
sending the most significant bit first. The four most
significant bits are zeroes.
Sends trace amplitude information only as binary value
in one 8-bit byte, composed from the 02 output bytes:
o o o o x x x x x x x x x x x 0 2
1 1
x x x x x x x x 0 4
Output Example of Marker
Amplitude. Marker is at - 10 dBm
Format
Command reference level.
03
01
o o o o x x x x
02
values 0 to 4095
04
values (a to 255 (full scale)
FORMAT STATEMENTS
1001
x x x x x x x x
x x x x x x x x
Programming 115
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