08 | Keysight | Low Current Semiconductor Measurements Using the B2980A Series Ammeter - Technical Overview
(continued)
Step 4. Press the [Run/Stop] key to start continuous current measurements. The “AUTO” indicator at the bottom of the screen shows
that the measurement is continuously repeating.
Step 5. Change the voltage source to edit mode using the procedure outlined in step 2. (B2985A/87A only).
Step 6. (1) Continue rotating the [Knob] and increasing the voltage until the current is between 10 to 20 mA.
(2) The LED starts to emit light at around 1.5 V.
Roll View shows the measurement history
Rotate slowly to increase the voltage. The
value increases as you rotate the [knob] clockwise.
Stop when the voltage reaches approximately 1.0 V.
(3)
Roll View shows the current drift status after the
LED’s temperature stabilizes.
(1)
Further rotate , and increase the voltage until
the current is between 10 to 20 mA.
(2) LED light up as
shown in the picture.
As the LED
heats up the
current drifts.
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