05 | Keysight | Low Current Semiconductor Measurements Using the B2980A Series Ammeter - Technical Overview
functions improve measurement data quality (continued)
Null (Zero cancel) capability:
To remove the effects of any residual offset currents, you can have the instrument
automatically subtract out these currents by pressing the Null key.
have been removed using the NULL function. Using the B2985A’s Roll View the data is
displayed over a 100 second time span. With these settings it is easy to see that a stable
100 aA level measurement can be made.
4. Histogram View enables real-time data distribution analysis
measurement data statistically in real-time. Once you know the characteristics of the
noise you are seeing you can decide if it is better to reduce the noise at its source or to
you can simply use the average of the histogram.
have when making measurements in a noisy test environment.
Figure 4(a) shows Histogram View results using 0.1 power line cycle (PLC) measurement
measured sigma is 0.17 pA. Figure 4(b) shows the same measurement performed using
measurement data. In this case the measured sigma is 0.018 pA, which is about 9.5 times
(= 0.17/0.018) smaller than the sigma shown in Figure 4(a).
The Roll View graph shows the measurement is
stable at the 100 aA level within a 100 sec interval.
Measurement condition:
- Speed: Quick
- 2 pA range
- Filter: 100 moving average
- Null: zero cancel
- DUT: Open condition
Quick measurement speed
Zero cancel Filtering
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