Model 2657A High Power System SourceMeter® Instrument Reference Manual Section 2: General operation
2657A-901-01 Rev. B/December 2012 2-5
7. USB port
Use the USB port to connect a USB flash drive to the instrument. The USB flash drive can be used
to store reading buffer data, scripts, and user setups. It can also be used to upgrade the firmware.
8. Display indicators (not shown)
The items listed below represent the possible display indicators and their meanings.
Indicator Meaning
EDIT Instrument is in editing mode
ERR Questionable reading or invalid calibration step
REM Instrument is in remote mode
TALK Instrument is addressed to talk
LSTN Instrument is addressed to listen
SRQ Service request is asserted
REL Relative mode is enabled
FILT Digital filter is enabled
AUTO Source or measure autorange is selected
* (asterisk) Readings are being stored in the buffer
Rear panel
The rear panel of Model 2657A is shown below. The descriptions of the rear-panel components follow
the figure.
Figure 2: Rear panel Model 2657A
1. RS-232
Female DB-9 connector. For RS-232 operation, use a straight-through (not null
modem) DB-9 shielded cable (Keithley Instruments Model 7009-5) for
connection to a computer.
2. DIGITAL I/O
Female DB-25 connector. Includes fourteen digital input or output pins, seven
GND pins, three +5 V pins, and one pin for interlock (active high enable). For
more information, see Digital I/O
(on page 3-80).
Use a cable equipped with a male DB-25 connector (Keithley Instruments
Model 7709-308).
LINE RATING
100-240 VAC
50, 60 Hz
350 VA MAX.
LINE FUSE
SLOWBLOW
5.0 A, 250 V
NO INTERNAL OPERATOR SERVICEABLE PARTS,
SERVICE BY QUALIFIED PERSONNEL ONLY.
REPLACE FUSE WITH SAME TYPE AND RATING.
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.
2 1
5
10
964
3
7 8
RS-232
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