2-12 Connections
Note that if the DUT is <1kΩ, you should use the 4-wire measurement method (remote sens-
ing) by connecting SENSE HI and LO to the DUT (Figure 2-7).
NOTE Guard current (I
G
) must never exceed 50mA. If it does, guard voltage will become
less than the output voltage and corrupt the measurement.
WARNING:NO INTERNAL OPERATOR SERVICABLE PARTS,SERVICE BY QUALIFIED PERSONNEL ONLY.
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.
CAUTION:FOR CONTINUED PROTECTION AGAINST FIRE HAZARD,REPLACE FUSE WITH SAME TYPE AND RATING.
MADE IN
U.S.A.
INPUT/
OUTPUT
42V
PEAK
250V
PEAK
TRIGGER
LINK
4-WIRE
SENSE
HI
LO
LINE RATING
100-240VAC
50, 60, HZ
100VA MAX
RS232
IEEE-488
(ENTER IEEE ADDRESS
WITH FRONT PANEL MENU)
250V
PEAK
5V
PEAK
5V
PEAK
5V
PK
V, Ω,
GUARD
GUARD
SENSE
LINE FUSE
SLOWBLOW
2.5A, 250V
INTERLOCK-
DIGITAL I/O
REMOTE
PreAmp
!
Triax
Cable
HI
DUT
WARNING
Guard is at the same voltage level as
input/output high. Therefore, if a
hazardous voltage (≥42V peak) is
present on input/output high, it is also
present on the guard terminals of the
Remote PreAmp and mainframe.
KEITHLEY
6430
REMOTE
PreAmp
SENSE
MAINFRAME
LO
Banana Plug Cables
6430 Mainframe (rear panel connectors)
Resistor
Network
Ohms Guard
<1kΩ
Guard Sense
Sense HI
Sense LO
<1kΩ
Triax
Cable
IN/OUT
HIGH
Preamp
Cable*
R
G
*Keithley part number: CA-176-1D.
Figure 2-7
Guarded ohms
connections
(6-wire ohms)
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