Keithley 6487 User Manual

2-4 Connections Model 6485 and 6487 User’s Manual
Voltage source output connectors
The rear panel V-SOURCE OUTPUT HI and LO connectors (see Figure 1-4 in Section 1)
are used to connect the voltage source to the D
UT. The voltage source is primarily used
for ohms measurements. See “Ohms measurement connections,” page 2-7 for details.
Maximum input levels
The maximum input levels to the Model 6487 are summarized in Figure 2-4.
WARNING The
maximum safe voltage between the voltage source or ammeter
common and chassis ground (common mode voltage) is 505V peak.
Exceeding this voltage can create a shock hazard.
Figure 2-4
Model 6487 maximum input levels
Input HI
Input LO
505V Peak
Chassis Ground
Max Continuous
Input = 505V Peak
505V Peak
Connecting cables and test leads
When making precision measurements, you should always use low-noise triax cables for
INPUT connections. As a general rule, always use the shortest possible cable for measure-
ments. When using the voltage source, the test leads must be rated for 505V minimum and
shoul
d include safety sheaths. See “Model 6487 input cables, connectors, and adapters
,”
page 1-5 in for recommended cables and test leads.

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%