Keithley 6485 User Manual

I-24 Applications Guide Model 6485 Picoammeter Instruction Manual
Figure I-21
PIN photo diode leakage
In total darkness, Avalanche diodes respond as shown by the solid line in Figure I-22.
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 I-22).
Figure I-22
Avalanche photo diode leakage
Connections are made to the Model 6485 through the BNC input connector (located on the
rear panel) (Figure I-23). In order to properly sequence voltage and measurement of leak-
age current, the instruments triggering needs to be linked. Trigger link connection to the
Model 2400 is made to the Model 6485 through the Trigger Link connector (located on the
rear panel).
I
V
05
P.I.N. photo diode
I
V
0
Avalanche photo diode
10 50 100
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Light

Keithley 6485 Specifications

General

Model	Keithley 6485
Category	Picoammeter
Input Impedance	>10^14 Ohms
Voltage Burden	<200µV
Accuracy	0.4% of reading
Voltage Source Range	Not Applicable
Voltage Source Resolution	Not Applicable
Voltage Source Accuracy	Not Applicable
Interface	IEEE-488
Power Requirements	100V to 240V AC, 50/60Hz
Dimensions	89 mm high x 214 mm wide x 369 mm deep (3.5 in x 8.4 in x 14.5 in)