Word Format; Byte Format; Compressed Format; Ascii Format - HP 54501A Programming Reference Manual
Digitizing oscilloscope
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Also See for 54501A:
- Operation reference (146 pages) ,
- Service manual (90 pages) ,
- Getting started manual (46 pages)
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BYTE Format
BYTE
format allows only
seven
bits to be used
to represent the voltage
values, with the first bit being the sign bit.
If
there
is
a
hole in the data,
it
is
represented
by
a
value
of
-1.
BYTE
formatted data will transfer over the
HP-ffi
faster than
WORD
formatted
data,
since
one byte per point
is
transferred in
BYTE
format
and two bytes per point are transferred in
WORD
format.
BYTE
formatted data
has
less
resolution than
WORD
formatted
data.
COMPRESSED
Format
The number of bytes
transmitted when the format
is
COMPRESSED
is
the same
as
the value returned
by
the
WAVEFORM:POINTS?
query.
Eight
bits
of
resolution are
retained in
the
COMPRESSED
format. So
that
a
hole in the data may be represented,
a
data value
of 255
is
mapped
to
254,
and 255
is
used to represent
a
hole.
This mode will give greater
vertical precision than
BYTE
formatted data, with faster transfer times
than
WORD
formatted
data, but
will probably require more time
once
transferred to be unpacked.
ASCII Format
ASCII
formatted waveform
records
are transmitted one
value at
a
time,
separated by
a
comma.
The
data values transmitted are the same
as
the
values
sent
in the
WORD FORMAT
except that they are converted to an
integer
ASCII
format (six or
less
characters) before being
sent over the
HP-IB.
Waveform Subsystem
17-6
HP54501A
Programming
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