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APPENDIX I
Because of the faster processing speed, the addition of new commands, the slight modification of some old
commands, and the input buffering capability of the HP 8566B, there are a few minor operating differences
between the HP 8566B and its predecessor, the HP 8566A. If you intend to
interchangeably, become familiar with the following differences.
EXPONENTIAL FORMAT
With the HP 8566B, any command that specifies the display address (e.g., DA, DR, DW), and which is given in
the exponential format (i.e., with notation El, E2, E3, etc.), executes its prescribed functions as described in this
manual. The HP 8566A, however, interprets the exponential notation as an analyzer command. For example, the
El notation is interpreted as a peak search command, the E2 notation as a marker-into-center-frequency com-
mand, etc.
The HP 8566A does not have an input buffer, and the HP-IB can be reset with an interface clear (IFC) . To reset the
input buffer in the HP 8566B, use a device clear (CLEAR 718). This way, any commands in the input buffer of the
HP 8566B are executed before instrument preset (IP) occurs. However, if device clear (CLEAR 718) is preceded
by interface clear (ABORT 7), an instrument preset (IP) occurs and clears the input buffer immediately. Thus, all
commands in the buffer are lost and not executed.
REMOTE INSTRUMENT PRESET
command causes the HP 8566A to preset its controls and run a check of its IO bus and memory.
R E L O C K
In the HP 8566A, the local oscillator (LO) is phase-locked to the reference oscillator after every data entry. In the
HP 8566B, the relock does not occur until the analyzer needs to relock for taking data readings. Because the
relock occurs less often in the HP 8566B than in the HP 8566A, the HP 8566B operates faster than the HP
8566A.
TIMING
The HP 8566B processes data faster than the HP 8566A (see RELOCK, above). Therefore, if you attempt to use
HP 8566A software with the HP 8566B, timing problems may occur.
Appendix I
OPERATING DIFFERENCES
use
the HP 8566A and HP 8566B
A p p e n d i x 4 9
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