Technical data

Waveform Commands 32
Agilent Infiniium 90000 Series Oscilloscopes Programmer's Reference 891
:WAVeform:PREamble?
Query :WAVeform:PREamble?
The :WAVeform:PREamble? query outputs a waveform preamble to the
computer from the waveform source, which can be a waveform memory or
channel buffer.
Returned Format
[:WAVeform:PREamble] <preamble_data><NL>
The preamble can be used to translate raw data into time and voltage
values. The following lists the elements in the preamble.
<preamble_
data>
<format>, <type>, <points>, <count> , <X increment>, <X origin>, < X
reference>, <Y increment>, <Y origin>, <Y reference>, <coupling>, <X display
range>, <X display origin>, <Y display range>, <Y display origin>, <date>,
<time>, <frame model #>, <acquisition mode>, <completion>, <X units>, <Y
units>, <max bandwidth limit>, <min bandwidth limit>
<format> 0 for ASCii format. 1 for BYTE format. 2 for WORD format. 3 for LONG
format. 4 for LONGLONG
<type> 1 RAW type. 2 AVERage type. 3 VHIStogram. 4 HHIStogram. 5 not used. 6
INTERPOLATE type. 7 not used. 8 not used. 9 not used. 10 PDETect.
<points> The number of data points or data pairs contained in the waveform data.
(See :ACQuire:POINts.)
<count> For the AVERAGE waveform type, the count value is the fewest number of
hits for all time buckets. This value may be less than or equal to the value
requested with the :ACQuire:AVERage:COUNt command. For RAW and
INTERPOLATE waveform types, this value is 0 or 1. The count value is
ignored when it is sent to the oscilloscope in the preamble. (See
:WAVeform:TYPE and :ACQuire:COUNt.)
<X increment> The X increment is the duration between data points on the X axis. For
time domain waveforms, this is the time between points. If the value is
zero then no data has been acquired. (See the :WAVeform:XINCrement?
query.)
<X origin> The X origin is the X-axis value of the first data point in the data record.
For time domain waveforms, it is the time of the first point. This value is
treated as a double precision 64- bit floating point number. If the value is
zero then no data has been acquired. (See the :WAVeform:XORigin? query.)
<X reference> The X reference is the data point associated with the X origin. It is at this
data point that the X origin is defined. In this oscilloscope, the value is
always zero. (See the :WAVeform:XREFerence? query.)