User`s guide

Agilent 4155C/4156C User’s Guide Vol.2, Edition 6 3-19

Sampling Measurements

Measurement Functions

Logarithmic Sampling Measurement

Logarithmic sampling mode plots the measurement data on the X-axis (@TIME) set

to the logarithmic scale by doing the following operation. See Figure 3-2.

1. Forces constant current, constant voltage, or pulsed constant bias.

2. Waits hold time.

3. Triggers one point measurement.

4. Measurement unit executes measurement. Measurement result data is stored in

memory.

5. Triggers one point measurement. Interval of trigger is constant (setting value of

INITIAL INTERVAL).

6. Measurement unit executes measurement if it is ready to measure. Measurement

result data is stored in memory.

Measurement unit waits next trigger if it is busy or in measurement.

7. Repeats steps 5 and 6 until that a sampling completion condition is satisfied.

Logarithmic sampling mode retains only the measurement data that can plot the

data on the logarithmic X-axis in almost the same distance.

Figure 3-2 Example Operation of Logarithmic Sampling

TIME

Hold Time

Discard

Sampling Interval

Starts

Sampling

Data of first decade

Measurement

Data of second decade

@TIME

This is the example

to plot LOG10 data.

Second decadeFirst decade

1/10 decade