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Models 2500 and 2502 User’s Manual Photodiode Measurements 4-5

Step 2. Set bias voltage source values.

Set up channel 1 and channel 2 voltage sources as follows:

1. Press SRC1 to edit the channel 1 source.

2. Use the RANGE  and  keys to select the source range that will accommodate the

value you want to set. For this example, set the range to 10V.

3. Using either the EDIT or numeric entry keys, enter the desired source value. For this

example, set the source value to +10V.

4. Press SRC2 to select the channel 2 source.

5. Use the RANGE  key to select the 100V range.

6. Again, using either the EDIT or numeric entry keys, set the bias source value to +20V.

Step 3. Turn source outputs on.

Turn both voltage source outputs on by pressing the ON/OFF OUTPUT key. The red

OUTPUT indicator will turn on to indicate the outputs are on.

Step 4. Observe readings on the display.

Observe the current readings in display. For this example, press MSR1 to display the cur-

rent on channel 1, or use MSR2 to display channel 2 power. If necessary, use the RANGE

 and  keys to manually select the current measurement range for that channel, or press

AUTO to select autoranging. Use the DISPLAY TOGGLE or CHANNEL SELECT keys

to display the desired readings.

Step 5. Turn source outputs off.

When ﬁnished making measurements, turn both voltage source outputs off by pressing the

ON/OFF OUTPUT key. The red OUTPUT indicator light will turn off.

Remote photodiode measurements

Photodiode measurement procedures can also be performed via remote by sending appro-

priate commands in the right sequence. The following paragraphs summarize the com-

mands and give a simple programming example.

Photodiode measurement commands

Table 4-2 summarizes commands used to make basic photodiode measurements. See

Section 17 for more information on using these commands as well as many other com-

mands that can be used for photodiode measurements.

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Keithley 2500 User Manual

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