Keithley 6487 Reference Manual

Model 6487 Reference Manual Measurement Concepts and Connections 2-9
General purpose test fixture
A general purpose test fixture is shown in Figure 2-7. This test fixture will accommodate a
variety of connection requirements.
Figure 2-7
General purpose test fixture connections
Test fixture chassis
• The chassis of the test fixture should be metal so that it can function as a shield for
the DUT or test circuit.
• The test box must have a lid that closes to prevent contact with live circuitry.
• The test fixture must have a screw terminal that is used exclusively for connection
to safety earth ground.
t^okfkd To provide protection from shock hazards, the test fixture chassis must
be properly connected to safety earth ground. A grounding wire (#18
AWG or larger) must be attached securely to the test fixture at a screw
terminal designed for safety grounding. The other end of the ground
wire must be attached to a known safety earth ground.
Metal Chassis
To Voltage
Source
To 6487
Input
To 6487
COMMON
Metal Guard Plate
Banana Jacks
3-Lug Female Triax Connector
Insulated
Terminal
Post (6)
Safety
Earth
Ground
A
A
A
B
B
DUT

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%