Keithley 2657A

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 RATING
100-240
VAC
50, 60 Hz
350 VA MAX.
LINE FUSE
SLOWBLOW
5.0
A, 250 V
NO INTERNAL OPER
ATOR SERVICEABLE P
AR
TS,
SER
VICE B
Y
QUALIFIED PERSONNEL
ON
LY
.
REPLACE FUSE WITH SAME
TYPE AND R
A
TING.
WARNING:
INPUT/OUTPUT CURRENT: 120 mA MAX.
RS-232
DIGIT
AL I/O
LAN
!
IEEE-488
!
!
SENSE
LO
HI
LO
GUARD
SENSE
HI
LO
3030 VDC
MAX.
250 V
MAX.
DIGITAL I/ODIGITAL I/O
HI LO
DIGITAL I/O
DIGITAL 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 *
DIGITAL I/O
Test fixture
interlock
switch
connections
WARNING