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Models 2500 and 2502 User’s Manual Photodiode Measurements 4-7

Photodiode measurement programming example

Table 4-3 summarizes the command sequence for a photodiode measurement procedure

using channel 1 to measure the current of the back photodiode detector, and channel 2

displaying optical power. Note that the steps correspond to those listed previously in

“Front panel photodiode measurement procedure.” See Figure 4-2 earlier in this section

for basic connections and Section 2 for detailed connection information.

These commands set up the Model 2500 as follows:

• Channel 1 measurement: current measurement, auto range

• Channel 2 measurement: optical power

• Channel 2 responsivity constant (R) of detector for wavelength of interest: 1

• Channel 2 dark current (D): 1

• Channel 1 source: 10V range, +10V amplitude

• Channel 2 source: 100V range, +20V amplitude

NOTE See Appendix H for a complete program listing.

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Keithley 2500 User Manual

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