04 | Keysight | Low Current Semiconductor Measurements Using the B2980A Series Ammeter - Technical Overview
2. Floating ammeter design provides stable measurements for both
(continued)
Figure 2 shows the case where one of the ends of the DUT is grounded. In this case the con-
nection scheme shown in Figure 1 cannot be used. The reason for this is that the ammeter
-
source (Vs) is connected to the ammeter common. The source voltage (Vs) is applied through
the ammeter’s input terminal.
– The ability to synchronize the voltage source output with the measurement timing.
– The ability to display the voltage and current relationship in an X-Y graph on the instrument front panel.
functions improve measurement data quality
Measurement Speed selection:
The B2980A series supports four measurement speeds: Quick, Normal, Stable, and Manual.
The Quick, Normal and Stable measurement speeds are available when using auto mode, and
they correspond to integrating over some fraction or multiple of the power line cycle (PLC).
For these cases the measurement speed is automatically set for a given measurement range
to provide the best data for the selected speed. If you want to control this parameter, then the
Filtering capability:
-
reduce noise effects.
A
A
-
+
+
DUT
Vs
Shield (GND)
Guard
Ammeter is connected on the voltage source.
i
Ammeter (high)
Ammeter
Common
(Floating)
DUT is grounded
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