Keithley 6487 Reference Manual page 51

Model 6487 Reference Manual
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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. Use filtering if the
noise is caused by a noisy input signal. Filtering is covered in
Figure 3-2
Connections for amps
237-ALG-2
Cable
A safety shield is advisable whenever floating measurements are being
made (see "Floating measurements," page
safety shield are shown in
completely surround the noise shield or floating 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 Model 6487.
Fundamental information on making connections to the picoammeter input is
provided in Section 2.
Red (HI)
Green
(Chassis)
Black (LO)
MADE IN
U.S.A.
CAT I
ANALOG OUT
!
505V PK
505V PK
505V PK
INPUT TRIGGER LINK
V-SOURCE OUTPUT
505V PK TO CHASSIS
LO HI
INTERLOCK
FUSE
400mAT
505V (SB)
MAX
200mAT
(SB)
Model 6487
Measurements and Sourcing Voltage
Figure 3-2. The metal safety shield must
Metal Noise Shield
Metal Safety Shield
Safety
Earth
Ground
IEEE-488
(CHANGE IEEE ADDRESS
DIGITAL I/O
WITH FRONT PANEL MENU)
RS-232
!
LINE RATING
50, 60Hz
LINE
50 VA MAX
100 VAC
120 VAC
220 VAC
240 VAC
2-12). Connections for the
Section 4.
3-9