09 | Keysight | Low Current Semiconductor Measurements
Using the B2980A Series Ammeter - Technical Overview
Example 1. Monitoring LED Forward diode current
(continued)
Step 7. As a inal step we will check the residual current of the test ixture.
(1) Close the lid of the test ixture.
(2) Disconnect the Vs cable from the ixture.
(3) Check the current transient in the Roll view display and note the
inal residual current.
Note that the residual current quickly reaches the pA level and eventually
stabilizes at the fA level (3 fA in about 100 seconds in this example).
Example 2. LED forward diode I/V characteristics
This example outlines how to plot LED current versus voltage (I/V) characteristics and it only applies to the B2985A/87A.
Note: If using the B2981A/83A then you need to plot the current measured by the B2981A/83A and the voltage applied by the external voltage source on a
PC to make this same type of I/V plot.
The following steps outline how to plot the I/V characteristics of an LED.
Step 1. (1) Press the [Meter View] function key at the bottom of the screen.
(2) Then press the [More ... 1 of 3] assist key twice so that the third set [More ... 3 of 3] of softkey labels is displayed on the
assist keys at the right of the screen.
(3) Press the [Show VS Func.] assist key to show the VS function menu.
Step 2. (1) Move the cursor by rotating the [Knob] until the cursor is on the VS Function and then select it by pushing the knob.
The VS Function is now in edit mode and the assist softkey menu at the right of the screen represents the available VS
Functions.
(2) Press on the [LINEAR SINGLE] assist key.
(3) press key.
3.
(1) Press key, then
(2) press key two times until key appears.
1.
2.
(1) Click on the VS Function by , and the VS
menu options are displayed.
(2) Press assist key.
1.
Move the cursor on the VS Function by rotating .
2.
