Model 2657A High Power System SourceMeter® Instrument Reference Manual
Section 2: General operation
2657A-901-01 Rev. B/December 2012
2-55
Figure 17: Three-terminal device connections using two SMUs: connections
Guarding and shielding
You can optimize source-measure performance and safety with the effective use of guarding and
shielding (noise and safety shields).
Safety shield
A safety shield must be used whenever hazardous voltages (>30 V RMS, 42 V peak) will be present
in the test circuit. To prevent electrical shock that could cause injury or death, never use the Model
2657A in a test circuit without a properly installed and configured safety shield.
9
LINE R
ATI
NG
100-240
VAC
50, 60 Hz
35
0
VA
MAX.
LI
NE
FU
SE
SLOWBLOW
5.0
A,
250 V
NO
INTE
RN
AL
OPE
RA
TO
R S
ER
VICEABLE P
AR
TS,
SE
RVICE B
Y QU
AL
IFI
ED
PE
RS
ONNEL
ON
LY.
REPLACE FUSE W
ITH
SAME
TYPE
AN
D R
ATI
NG.
W
ARNING:
INPU
T/OUTPUT CURRENT: 120 m
A MAX.
RS-
232
DIGI
TA
L I
/O
LAN
!
IEEE-48
8
!
!
SE
NSE
LO
HI
LO
GUA
RD
SE
NSE
HI
LO
30
30
VD
C
MA
X.
25
0 V
M
AX
.
DIGIT
AL I/O
DIGIT
AL I/O
HI LO
DIGIT
AL
I/O
DIGIT
AL
I/O
1
7
3
2a
2b
* Additional
connections
for redundant protective
earth (safety ground)
may be required
6
6
5
5
HI LO/
SLO
10
8
4 *
DIGIT
AL I/O
Test fixture
interlock
switch
connections
WARNING
Summary of Contents for 2657A
Page 3: ......
