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06 | Keysight | Low Current Semiconductor Measurements Using the B2980A Series Ammeter - Technical Overview
4. Histogram View enables real-time data distribution analysis
(continued)
This example shows how you can use line frequency averaging and data iltering in
conjunction with the Histogram View to improve data quality
Note: The sample histogram shown in Figure 4(a), which has a bimodal distribution with peaks at both
ends, is typical of the situation where sinusoidal power line voltage is the main noise source. Figure 4(b)
illustrates that the line frequency noise components can be iltered out using power line cycle integra-
tion and data averaging.
Measurement condition:
- Speed: 0.1 PLC
- Filtering: None
(a) 0.1 PLC speed measurement.
Figure 4. Using histogram view and other functions to improve measurement data.
Low Current Measurement Example
Measurement steps on B2985A/87A front panel operation
This section gives step-by-step instructions on how to use the B2980A's Femto/Picoam-
meter to perform low current (I/V) characterization using an LED as the test device. The
B2985A Electrometer/High Resistance Meter is used in the example because it has a
built-in voltage source so that no additional external instruments are required to apply
voltage to the LED.
Note: To make the same measurements using the B2981A/B2983A Femto/
Picoammeter requires some modiications to the software key sequences and
steps shown in this example (although the ammeter setup is identical).
Of course, when using the B2981A/B2983A you need to supply an external
voltage source to measure the I/V characteristics.
You can download the test setup of the following examples from the
next link; www.keysight.com/ind/SensitiveMeasurements
Example 1. Monitoring LED Forward diode current
Figure 5 shows the proper connections to measure the I/V charac-
teristics of an LED. Note that it is important to connect the ammeter
common to the chassis ground using the banana to lug cable as
shown in the igure.
Note: If the ammeter common and the test ixture shield are connected,
then this ground connection is not necessary.
Measurement condition:
9.5X improvement
- Speed: Normal
in noise distribution
- Filtering: Moving average (100 points)
(b) Normal speed measurement using the data averaging.
B2980A Series
Ammeter
Triax cable
+
A
A
Common
Chassis ground
Connect with the
Banana to lug cable
Figure 5. LED I/V measurement setup example.
Test Fixture (N1295A)
N1254A-101
LED
adapter
J1
adapter
Vs High
+
Vs
Vs Low
Coax
cable
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