Keithley 2657A

Model 2657A High Power System SourceMeter® Instrument Reference Manual Section 2: General operation
2657A-901-01 Rev. B/December 2012 2-57
Figure 18: High-impedance guarding
LINE R
A
TING
100-240
V
AC
50, 60 Hz
350
V
A
MAX.
LINE FUSE
SLOWBLOW
5.0 A, 250 V
NO INTERNA
L OPER
A
T
OR SERVICEABLE P
A
RTS,
SERVICE B
Y QUALIFIED PERSONNE
L
ON
L
Y
.
REPLACE FUSE WITH SAME
TYPE AND RA
TING.
WARNING:
INPUT/OUTPUT CURRENT: 120 mA MAX.
RS-232
DIGITAL I/O
LAN
!
IEEE-488
!
!
SENSE
LO
HI
LO
GUARD
SENSE
HI
LO
3030 VDC
MAX.
250 V
MAX.
DIGITAL I/O
HI LO
DIGITAL I/O
!
SENSE
LO
HI
LO
GUARD
SENSE
HI
LO
3030 VDC
MAX.
250 V
MAX.
Model 2657A
DIGITAL I/O
1
14
13
25
4 **
1
7
4 **
3
6
7
Guard*
LO
HI
3
2
2
* Guard connected to
metal guard shield.
** Additional connections
for redundant protective
earth (safety ground)
may be required
5
5
Ground symbols
Chassis
Protective earth
(safety ground)
Metal guard
shield
DUT
>1 GΩ
NC
1
6
Test fixture
interlock
switch
connection
+5 VDC