Model 6487 Reference Manual Measurements and Sourcing Voltage 3-9
t^okfkd A safety shield is advisable whenever floating measurements are being
made (see “Floating measurements,” page 2-12). Connections for the
safety shield are shown in Figure 3-2. The metal safety shield must
completely surround the noise shield or floating test circuit and it must
be connected to safety earth ground using #18 AWG or larger wire.
klqb 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.
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 Section 4.
Figure 3-2
Connections for amps
Black (LO)
Red (HI)
237-ALG-2
Cable
Metal Noise Shield
Metal Safety Shield
Safety
Earth
Ground
Green
(Chassis)
Model 6487
120
LINE RATING
50, 60Hz
50 VA MAX
INPUT
(CHANGE IEEE ADDRESS
WITH FRONT PANEL MENU)
IEEE-488
CAT I
TRIGGER LINK
RS-232
MADE IN
U.S .A .
ANALOG OUT
DIGITAL I/O
INTERLOCK
505V
MAX
V-SOURCE OUTPUT
505V PK TO CHASSIS
LO HI
!
!
FUSE LINE
400mAT
(SB)
100 VAC
120 VAC
200mAT
(SB)
220 VAC
240 VAC
505V PK
505V PK
505V PK
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