Models 2500 and 2502 User’s Manual SCPI Command Reference 17-73
Logarithmic sweep
Logarithmic sweep from 10V to 100V in 20 points:
*RST
SOUR1:SWE:SPAC LOG
SOUR1:VOLT:STAR 1
SOUR1:VOLT:STOP 100
SOUR1:SWE:POIN 20
TRIG:COUN 20
SOUR1:VOLT:MODE SWE
OUTP1 ON
INIT
To determine the source values that will be generated:
Start: 10 Log
10
(Start): 1
Stop: 100 Log
10
(Stop): 2
LogStep = (Log
10
(Start) - Log
10
(Stop)) / (SWE:POIN -1)
= (2-1) / (20 - 1)
= 1/ 19
= 0.105263
Now add the LogStep value to Log
10
(Start) and to each subsequent result. This will create
a list of Log
10
values. Next take the anti-log of each Log
10
value to get the actual sweep
values:
Value# Log
10
Value Sweep Value (V)
1 1.0000000 10.000000
2 1.0526316 11.288379
3 1.1052632 12.742751
4 1.1578948 14.384501
5 1.2105263 16.237767
6 1.2631579 18.329807
7 13157895 20.691382
8 1.3684211 23.357217
9 1.4210527 26.366513
10 1.4736842 29.763514
11 1.5263158 33.598184
12 1.5789474 37.926905
13 1.6315790 42.813329
14 1.6842105 48.329299
15 1.7368421 54.555947
16 1.7894737 61.584823
17 1.8421053 69.519286
18 1.8947369 78.476007
19 1.9473684 88.586675
20 2.0000000 100.00000
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