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Models 2500 and 2502 User’s Manual Photodiode Measurements 4-3

Conﬁguring measurements

Follow the steps below to conﬁgure channel 1 or channel 2 measurement functions.

1. Press CONFIG then the MSR1 or MSR2 key to access the conﬁguration menu for the

channel you are conﬁguring.

2. From the displayed conﬁguration menu, select the math function you wish to use on

that channel (I, I/V, V/I, MX + B, P , or P→), then press ENTER.

3. If you choose MX + B, conﬁgure the appropriate M (slope) and B (offset) parameters

for that function at the display prompts.

4. After conﬁguring all parameters, press EXIT to return to normal display.

Optical power

The Model 2500 has a built-in function for converting photodiode current to optical

power.

1. Press CONFIG then MSR1 or MSR2 to select the conﬁguration menu for channel 1 or

channel 2.

2. Select P→, then press ENTER.

3. At the prompt, enter the desired R (responsivity) value, then press ENTER.

4. At the prompt, enter the desired D (dark current), then press ENTER.

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Keithley 2500 User Manual

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