HP E1563A User Manual page 72

DATA:ALL?
Parameters
Comments
Note
72 Digitizer Command Reference
[SENSe:]DATA:ALL? <rdgs_per_channel> command returns voltage formatted
data from each active channel.
Parameter Name
rdgs_per_channel
**(memory size in bytes) / (number of channels * 2) = 128M/4 or 128M/8 (MAX)
•
The readings are returned in an array in an interleaved configuration. That is,
the array contains the first reading from channel 1, channel 2, etc. This is
followed by the second reading from channel 1, channel 2, etc.
This command can read the data from a measurement only once. It is a
destructive read and the data cannot be retrieved a second time.
•
The number of readings this command will return for each channel is
determined by the number of samples set by the SAMPle:COUNt command.
The total number of readings returned is the number of samples X the number
of channels. If a measurement is aborted with the ABORt command, there
may be less readings available than indicated by (samples X channels). For
ABORted measurements, use DATA:COUNt? to determine how many
readings are available.
•
Data is returned as raw data (16-bit integers) when the data format is set to
PACKed (see the FORMat[:DATA] PACKed command). Use either of the
two methods shown below to convert the raw readings to voltages:
voltage = reading * range/32768
voltage = reading * resolution
NOTE: Use the [SENSe:]VOLTage[:DC]:RESolution?
command to obtain the resolution value.
•
Data is returned as real numbers when the data format is set to REAL (see the
FORMat[:DATA] REAL command). The data is returned in voltage units
and no scaling conversion is required as with the PACKed format. Readings
are in an interleaved configuration as described in the first bullet item.
•
Both PACKed and REAL formats return data preceded by the IEEE-488.2
definite length arbitrary block header. The header is as follows:
# <num_digits> <num_bytes>
Parameter Range of
Type Values
numeric 1 to 32M** (E1563A)
1 to 16M** (E1564A)
Default
Units
none