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G-6
GPIB 488.1 Protocol
2400 Series SourceMeter
®
User’s Manual
GPIB reading speed comparisons
The tables that follow compare the differences in reading speed for the SCPI and 488.1
protocols. 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
Table G-1
through
Table 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
509.6
511.5
0.37%
0.10.external
438.4
440.2
0.41%
Normal
1.00/internal
59.0
59.0
0.00%
1.00/external
57.9
57.9
0.00%
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
471.6
0.29%
0.10.external
409.3
409.8
0.12%
Normal
1.00/internal
58.4
58.4
0.00%
1.00/external
57.3
57.3
0.00%
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