Keithley 6487 User Manual

Model 6485 and 6487 User’s Manual Connections 2-7
Figure 2-7
Basic Model 6487 current measurement connections
HI
LO
DUT
INPUT*
6487
* Maximum Continuous Input: 505V Peak
WARNING If it is possible for the DUT or external supply to present more than
505V to the input HI, it is imperative that the connection between
input LO and the external voltage source be sufficiently low imped-
ance and capable of carrying the short-circuit
current of the source, in
order that the LO not exceed 505V.
CAUTION Current limiting resistors are required
for DUTs capable of forcing
voltages 505V or greater. Damage to the instrument may result if volt-
ages greater than 505V are forced on
the Model 6487 INPUT HI.
Ohms measurement connections
Basic connections for ohms measurements are shown in Figure 2-8; the DUT is the resis-
tance to be measured. Circuit high is connected to the center cond
uctor of the INPUT con-
nector and circuit low is connected to the V-SO
URCE OUTPUT HI terminal. Note that
INPUT LO and V-SOURCE OUTPUT LO are connected together externally.

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%