Keithley 6487 User Manual page 53

3-6 Measurements and Sourcing Voltage
Step 5. Connect the current to be measured to the picoammeter
Basic connections for measurements are shown in
WARNING
NOTE
Step 6. Disable zero check and take a reading from the display
If the readings are noisy, you may want to use filtering to reduce noise. Filtering is covered
in Section
Figure 3-1
Connections for current measurements
237-ALG-2
Cable
A safety shield is advisable whenever floating measurements are being
made. Connections for the safety shield are shown in
metal safety shield must completely surround the noise shield or float-
ing test circuit, and it must be connected to safety earth ground using
#18 AWG or larger wire.
When not making floating measurements, it is recommended that you ground
measurement LO at only one place in the circuit, such as with the ground link
connection on the rear panel of the 6487. (See
Fundamental information on making connections to the picoammeter input is
provided in Section 2.
4.
Red (HI)
Green
(Chassis)
Black (LO)
MADE IN
U.S.A.
CAT I
ANALOG OUT DIGITAL I/O
!
505V PK
505V PK
505V PK
TRIGGER LINK
INPUT RS-232
V-SOURCE OUTPUT
505V PK TO CHASSIS
!
LO HI
INTERLOCK
FUSE LINE
630mAT 100 VAC
505V
(SB) 120 VAC
MAX
315mAT 220 VAC
(SB) 240 VAC
Model 6487
Figure 3-1.
"Ground loops," page
Metal Noise Shield
Metal Safety Shield
Safety
Earth
Ground
IEEE-488
(CHANGE IEEE ADDRESS
WITH FRONT PANEL MENU)
LINE RATING
50, 60Hz
50 VA MAX
Model 6487 User's Manual
Figure 3-1. The
B-2.)