Keithley 6487 Reference Manual

G-24 Applications Guide Model 6487 Reference Manual
P.I.N. (Positive Intrinsic Negative) diodes respond as shown in Figure G-20.
Figure G-20
PIN photodiode leakage
In total darkness, Avalanche diodes respond as shown by the solid line in Figure G-21.
Notice the small irregularity of the curve while sweeping around 10-12V. This irregularity
is made larger under additional applied light (see dashed lines of Figure G-21).
Figure G-21
Avalanche photodiode leakage
I
V
05
P.I.N. photodiode
I
V
0
Avalanche photodiode
10 50 100
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Keithley 6487 Specifications

General

Type	Picoammeter/Voltage Source
Current Measurement Range	20 fA to 20 mA
Interfaces	GPIB, RS-232
Voltage Burden	< 200 µV
Input Impedance	>10^14 Ω
Power	100 V / 120 V / 220 V / 240 V
Basic Current Measurement Accuracy	0.4%