Module 7
Measurement Functions
7-14
Interval
Hold Time
Starts sampling
Voltage or current
Channel 1 output
Voltage or current
Channel 2 output
Bias hold time
Measurement time
Source
Base
Source
: Measurement
Time
Time=0 (origin)
Time=Hold time + a
Time=Hold time + Interval + b
a
b
a, b : time from measurement start to integration start
I/V-t Sampling Measurement
B1500A supports the sampling measurement which performs the operation shown above.
With the SEQUENTIAL output sequence, the source channels start to force the Source value
sequentially. Then the last source channel forces the Base value, and forces the Source value after
the Bias hold time. After the Hold time, the measurement channels start measurement sequentially,
and repeat this in the specified interval if the measurement channel is ready to measure. After the
last sampling measurement, the source channels stop output sequentially.
The order of source output is defined in the Channel Setup. Top of the channels on the setup screen
starts output first. And the following channels start output sequentially. After the measurement, the
source channels stop output sequentially in the opposite order.
With the SIMULTANEOUS output sequence, the source channels start to force the Base value
simultaneously. And the channels force the Source value after the Base hold time. After the Hold
time, the measurement channels start measurement sequentially, and repeat this in the specified
interval if the measurement channel is ready to measure. After the last sampling measurement, the
source channels stop output simultaneously.
For the measurement channels which use the high resolution A/D converter, the order of
measurement is defined in the SMU Range Setup. Top of the channels on the setup screen starts
measurement first. And the following channels start measurement sequentially. For the
measurement channels which use the high speed ADC, the channels start measurement
simultaneously.
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