Keithley 6482, Reference Manual

Page: 43 / 350

2-6 Return to Section Topics 6482-901-01 Rev. A / August 2012
Section 2: Connections Model 6482 Dual-Channel Picoammeter / Voltage Source Reference Manual
Voltage source connections
Figure 2-4 shows the connecting scheme for using the Model 6482 as a voltage bias source. Note
that the device under test (DUT) HI terminal is connected to the OUTPUT terminal of the voltage
source (Channel 1 output), and the DUT LO terminal is connected to INPUT LO (analog common,
which is the inner shield of the INPUT jack). The maximum voltage source output is 30 V at 20 mA.
Figure 2-4
Voltage source connections
NOTE If an optional noise shield is used, connect the shield to INPUT LO (inner shield of triaxial
cable).
Connection considerations
To avoid noise and offset currents that could degrade measurement accuracy, be sure to use only
quality, low-noise triaxial cables for INPUT connections. Also, keep cables and test fixtures away
from vibration and varying temperatures to minimize generated cable currents. See
Appendix D ,
“Measurement Considerations,” for information on these and other possible measurement
problems and how to avoid them.
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
VOLTAGE
SOURCE
OUT
30 V @ 20mA
DUT
Channel 1 output
LO
HI
Triaxial cable*
* The triaxial cable’s center conductor is not connected; the cable’s
outer shield is also not connected.
Optional noise
shield (connect
to INPUT LO)
Model 6482
INPUT LO
(inner shield)