Keithley 6482 - Ground Connect Mode Connections

6482-901-01 Rev. A / August 2012 Return to Section Topics 2-7
Model 6482 Dual-Channel Picoammeter / Voltage Source Reference Manual Section 2: Connections
Ground connect mode connections
The VOLTAGE SOURCE output jack for either channel can either be connected to chassis ground
or left floating, depending on the selected ground connect mode. See Section 3, “Ground connect
mode,” for details. With ground connect disabled, you must make separate connections to the
VOLTAGE SOURCE OUTPUT jack, as shown in Figure 2-4. However, with ground connect
enabled, you can bias and measure the device under test (DUT) using a single triaxial cable, as
shown in Figure 2-5. Note that one device under test (DUT) terminal is connected to INPUT HI,
while the other DUT terminal is connected to chassis ground through the outer shield of the triaxial
cable connection. Figure 2-6 shows an equivalent circuit.
Figure 2-5
Test connections using ground connect mode
WARNING:
NO INTERNAL OPERATOR SERVICABLE PARTS,SERVICE BY QUALIFIED PERSONNEL ONLY.
CAUTION:
FOR CONTINUED PROTECTION AGAINST FIRE HAZARD,REPLACE FUSE WITH SAME TYPE AND RATING.
SERIAL NO.
120
LINE RATING
50, 60Hz
60 VA MAX
FUSE LINE
630 mAT
(SB)
315 mAT
(SB)
100 VAC
120 VAC
220 VAC
240 VAC
CAT I
MADE IN
U.S.A.
OUTPUT ENABLE
RS-232
TRIGGER LINK
INPUT
RATINGS MAX.
30 V @ 20mA
CHANNEL 1
CHANNEL 2
RATINGS MAX.
COMMON
MODE
200V
!
!
IEEE-488
(CHANGE IEEE ADDRESS
WITH FRONT PANEL MENU)
ANALOG
OUT
RATINGS MAX.
30 V @ 20mA
VOLTAG E
SOURCE
OUT
30 V @ 20mA
INPUT HI
INPUT HI
Optional noise
shield (connect
to INPUT LO)
INPUT LO
INPUTS
INPUT HI: Center conductor
INPUT LO: Inner shield
Chassis ground: Outer shield
Chassis ground
Chassis ground
Triaxial cables
DUT 1
DUT 2
Model 6482