HP 4284A - Page 218

Note
When the data buer memory is used, use the following rules.
The measurement data after sending the MEMory:FILL DBUF
command to use the data buer memory capabilities are stored
into the data buer memory in the order measured.
When triggering the HP 4284A using the TRIGger:IMMediate
command, the measurement results are entered only into the data
buer memory.Soyou don't have to clear the output buer.
When triggering using the *TRG or Group Execution Trigger
( GET ) command, the measurement results are entered into both
the data buer memory and the output buer. So the output
buer must be cleared every time the HP 4284A's controller
reads the measurement results. If you don't, error ( 0 410, "Query
INTERRUPTED" ) will o ccur.
When the number of sets of measurement data exceeds the
capacity of the buer memory, all of the overowed measurement
data are lost, error 90: "Data Memory Overflow" o ccurs, and bit 3
of the standard event status register is set to 1. If y
ou enter new
data into the data buer memory, the data buer memory should
rst be cleared using the MEMory:CLEar DBUF command.
When the number of sets of measurement data is less than the
capacity of the buer memory, the following data, instead of the
actual measurement data, are input to the unused p ortion of the
data buer memory.
< DATAA > : 9.9E37
< DATAB > : 9.9E37
< STATUS > : 0 1
< BIN No. > or < IN/OUT > : 0
When the data buer memory capabilities are used during a list
sweep measurement, the measurement result of one sweep p ointis
stored as one set of measurement data. So when two or more sweep
points are the same, and are adjacent, the HP 4284A measures
the device once, but the number of data sets stored is equal to the
number of sweep p oints.
When the limit function of the list sweep measurement is set
to OFF at a sweep p oint, < IN/OUT > is 0. Also when the
comparator function is set to OFF, the < BIN No. > is 0.
There are two formats returned by MEMory:READ? DBUF query,
ASCII and BINARY. Each format is described b elow. (The sample
programs using the data buer memory (returned format: ASCI I and
BINARY) are shown later in this chapter.)
ASCII Format
When the ASCII format is selected as a data format, the returned
format is as follo ws. The < DATAA > , < DATAB > , < STATUS > ,
Remote Control 7-17