Figure 3-2 Connections For Unguarded Volts And Ohms - Keithley 6514 Instruction Manual

Step 5
NOTE
WARNING
Unguarded connections — Connections for unguarded volts and ohms measurements are
shown in Figure 3-2, where the DUT is the voltage or resistance to be measured. If a hazardous
voltage (>30V) is present on the noise shield, or the test circuit is floating above earth ground at
a hazardous voltage level, a safety shield must be used as shown.
Figure 3-2
Connections for
unguarded volts and
ohms
237-ALG-2
Cable
INPUT 250V PK
INPUT
OFF
V,
(PROGRAMMABLE)
GRD Disabled
Connect the DUT to the electrometer
Fundamental information on making connections to the electrometer input is pro-
vided in Section 2 ("Connection Fundamentals").
A metal safety shield is required whenever a hazardous voltage (>30V) is
present on a noise shield or guard shield. As shown in Figures 3-2 and 3-3,
the safety shield must be connected to safety earth ground using #18 AWG
wire or larger.
Red (HI)
Green
DUT
(Chassis)
Black (LO)
!
PREAMP OUT 2V ANALOG
250V PK OUTPUT
DIGITAL I/O TRIGGER LINK
PREAMP
PREAMP
OUT
10K
ON
2V ANALOG
GUARD
OUTPUT
(FOLLOWS
GUARD INPUT)
COM
(INTERNAL)
Volts and Ohms Measurements
Metal Noise Shield
Metal Safety Shield
Safety
Earth
Ground
COMMON CHASSIS
RS232
LINE RATING
50, 60Hz
!
60 VA MAX
FUSE LINE
630mA T 100 VAC
(SB) 120 VAC
220 VAC
315mAT
240 VAC
(SB)
6514 Rear Panel
MADE IN
U.S.A.
IEEE-488
(CHANGE IEEE ADDRESS
WITH FRONT PANEL MENU)
3-5