03 | Keysight | Low Current Semiconductor Measurements Using the B2980A Series Ammeter - Technical Overview
Measurement Basics and the B2980A Series Performance
1. Low noise, low impedance and low current ammeter provides stable
measurement data
The B2980A Series ammeter has the following features:
– The B2980A’s low noise design achieves better than 100 aA current measurement (with 10 aA minimum
resolution).
– The low input resistance and low offset voltage allow a faster measurement response and more accurate
measurement results.
These features provide the B2980A Series ammeter with the ability to perform stable measurements
across a wide range of applications (especially very low current measurements).
and grounded DUTs
-
ing current to the device under test (DUT). The ammeter common is connected to the inner shield of
The chassis is connected to earth ground through the power cable ground connection.
ammeter connected at the other end. Since the ammeter is not connected to earth ground, any com-
A
A
-
+
DUT
Shield
(GND)
i
Ammeter (high)
Ammeter
Common
(Floating)
Im
common
DC source
Ground noise
DUT is floating
X
No ground
loop noise
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