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

Front panel photodiode measurements

Photodiode measurement circuit conﬁguration

The basic circuit conﬁguration for the photodiode measurement procedures in this section

is shown in Figure 4-2. This example shows channel 1 connections to one photodiode.

Channel 2 connections to the other photodiode are similar. See Section 2, “Connections,”

for detailed connection information.

Figure 4-2

Circuit conﬁguration for photodiode measurements

Front panel photodiode measurement procedure

Step 1. Conﬁgure measurement functions.

For this example, channel 1 will be used to measure the current of the back photodiode

detector, while channel 2 will measure the forward photodiode optical power. Conﬁgure

each channel as follows:

1. To conﬁgure channel 1, press CONFIG then MSR1.

2. From the CONFIG MSR1 BUTTON menu, select I, then press ENTER.

3. To conﬁgure channel 2, press CONFIG then MSR2.

4. From the CONFIG MSR2 BUTTON display, select P→, then press ENTER. Set the

parameters R and D as desired.

Model 2500

INPUT HI

CHANNEL 1

VOLTAGE SOURCE

OUTPUT CHANNEL 1

See Section 2 for detailed connections.

Floating

Analog

Common

Photodiode

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Keithley 2500 User Manual

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