Agilent 4155B/4156B User’s Guide Vol.2, Edition 5 2-31
Measurement Mode
Sampling Measurement Mode
@TIME Value
@TIME value of measurement data is determined by MODE, INITIAL
INTERVAL, NO. OF SAMPLES, and HOLD TIME parameters. Where MODE
decides number of measurement points in 1 decades. For example, LOG10 mode
obtains 10 data per 1 decade.
An example to get measurement data in logarithmic sampling measurement is
explained below. This example assumes the following settings. See also Figure 2-7.
• MODE = LOG10 (10 data / 1 decade)
• INITIAL INTERVAL = 10 ms
• NO.OF SAMPLES = 20
• HOLD TIME = 10 ms
• STOP CONDITION = DISABLE
If sampling interval is enough longer than measurement time:
INITIAL INTERVAL value decides the range of a decade.
10 ms to 100 ms (1st decade) Sampling is executed at the following @TIME
value: 10 ms, 20 ms, 30 ms, 40 ms, 50 ms, 60 ms, 70 ms, 80
ms, 90 ms, 100 ms. LOG10 mode allows to have 10 data in 1
decade. Therefore all measurement data is stored in memory.
100 ms to 1 s There are 90 sampling points in this range. Number of data can
remain is only 10. They can plot the data on the X-axis in
almost the same interval.
@TIME values are as follows:
140 ms, 170 ms, 210 ms, 270 ms, 330 ms, 410 ms, 520 ms,
650 ms, 810 ms, 1.02 s.
If sampling interval is less than measurement time:
Measurement time decides the range of a decade. If the measurement time is 18 ms,
interval of measurement is 20 ms, and the following data are stored in memory:
20 ms to 200 ms (1st decade) Sampling is executed at the following @TIME
value: 20 ms, 40 ms, 60 ms, 80 ms, 100 ms, 120 ms, 140 ms,
160 ms, 180 ms, 200 ms. LOG10 mode allows to have 10 data
in 1 decade. Therefore all data is stored in memory.
200 ms to 2 s There are 90 sampling points in this range. Number of data can
remain is only 10. They can plot the data on the X-axis in
almost the same interval.
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