HP E1563A User Manual page 71

Note
1. Measurement data on channels not in the specified channel list is thrown away
by this command and is not recoverable.
2. 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 specified 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?
•
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>
# signifies a block transfer
<num_digits> is a single digit (1 through 9) which specifies how many digits
(ASCII characters) are in the <num_bytes> descriptor which follows
<num_bytes> is the number of data bytes which immediately follow the
<num_bytes> field
•
A full scale reading may actually be an overload.
•
A deadlock can occur when trigger events are set to BUS or HOLD because a
software trigger could not break in after this command is sent.
•
Executable when initiated: Yes
•
Coupled command: No
•
Reset (*RST) condition: none
command to obtain the resolution value.
Digitizer Command Reference 71