G-6 GPIB 488.1 Protocol
GPIB reading speed comparisons
The tables that follow compare the differences in reading speed for the SCPI and 488.1 pro-
tocols. Included in all tables is the percentage improvement achieved with the 488.1 protocol
compared to the SCPI protocol. The most significant speed improvements are shown in the
shaded areas of the tables.
Sweep operation
Tables G-1 through G-4 show bus reading rates for measure-only, source-measure, source-
measure-limit test, and source-memory sweep operation respectively. Note that the reading rate
for sweep operation can be increased by almost 50%.
Table G-1
SCPI/488.1 reading speed comparisons for measure-only sweep operation (rdgs/sec)
Speed NPLC/Trig. origin SCPI 488.1 Improvement
Fast 0.01/internal 1198.7
1759.6 46.78%
0.01/external 1079.3
1254.7 16.25%
Medium 0.10/internal 0509.6 0511.5 00.37%
0.10/external 0438.4 0440.2 00.41%
Normal 1.00/internal 0059.0 0059.0 00.00%
1.00/external 0057.9 0057.9 00.00%
Table G-2
SCPI/488.1 reading speed comparisons for source-measure sweep operation (rdgs/sec)
Speed NPLC/Trig. origin SCPI 488.1 Improvement
Fast 0.01/internal 999.9
1369.3 36.94%
0.01/external 916.0
1035.2 13.02%
Medium 0.10/internal 470.2 0471.6 00.29%
0.10/external 409.3 0409.8 00.12%
Normal 1.00/internal 058.4 0058.4 00.00%
1.00/external 057.3 0057.3 00.00%
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