Agilent Technologies B1500A Servisní příručka stáhnout pdf (Strana 458)

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4-142 Agilent B1500A/B1505A Programming Guide, Edition 11

Command Reference

For the linear sampling: 100001 / (number of measurement channels)

For the log sampling: 1 + (number of data for 11 decades)

h_base Hold time of the base value output until the bias value output. Numeric

expression. in seconds. 0 (initial setting) to 655.35 s, resolution 0.01 s.

Sampling

Operation

Sampling measurement will be started by a measurement trigger such as the XE

command or an external trigger, and performed as shown below. Before the

measurement trigger, the source channels set by the DI/DV commands will start

output at the timing of the DI/DV command execution.

1. By the measurement trigger, source channels set by the MI/MV commands start

the base value output. Each source channel controls the output simultaneously.

2. h_base seconds later, the source channels change the output to the bias value.

The channels keep the value until the end of the sampling measurement.

3. Another h_bias seconds later, the measurement channels start measurement for

the first sampling point. The measurement channels perform the measurement in

series by the order set to the MM command.

4. After that, the following operation is repeated with the specified time interval.

• Measurement channels start measurement if they are ready to measure.

• Measurement channels keep the condition if they are busy.

This operation is repeated until the number of measurement result data reaches

to the specified number of measurement data.

For the linear sampling with interval < 2 ms, if the total measurement time runs

over the specified time interval × number, the sampling measurement will be

stopped even if the number of measurement result data is less than the specified

number.

For the log sampling, the B1500 holds only the data that can be plotted on the

log scale in the same distance as close as possible. Only the held data is counted

in the number of measurement result data.

5. The sampling measurement is completed. And the source channel set by the

MI/MV command forces the base or bias value specified by the MSC command.

The source channel set by the DI/DV command keeps its output.

The index data (max. 9999999) and the time data returned with the measurement

data will be as shown in the following formula. However, long measurement or busy

status may cause unexpected time data.

time data = t + h_bias + (index data -1) × interval

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