4-2
4.4
INPUT connector cleaning
The INPUT connector insulators may become contaminated,
either through touching, or from air-borne deposits. Such
contamination may reduce the input impedance of the Model
6517A, affecting high-impedance and low-current
measurements.
If the INPUT connector insulators become contaminated,
they should be cleaned using a small foam swab dipped in
clean methanol. After cleaning, blow dry with dry nitrogen
or allow the connector to dry for several hours in a 50°C,
low-humidity environment before use. To avoid further con-
tamination after cleaning, keep the connecting cable or the
dust cap on the INPUT connector at all times.
Table 4-1
Power line fuse
Line voltage
Rating
Keithley
part no.
90-125V
180-250V
250V, 1/2A, Slow Blow
250V, 1/4A, Slow Blow
FU-71
FU-96-4
Note: 5
×
20mm fuses required
WARNING:
NO INTERNAL OPERATOR SERVICABLE PARTS,SERVICE BY QUALIFIED PERSONNEL ONLY.
WARNING:
NO INTERNAL OPERATOR SERVICABLE PARTS,SERVICE BY QUALIFIED PERSONNEL ONLY.
CAUTION:
FOR CONTINUED PROTECTION AGAINST FIRE HAZARD,REPLACE FUSE WITH SAME TYPE AND RATING.
CAUTION:
FOR CONTINUED PROTECTION AGAINST FIRE HAZARD,REPLACE FUSE WITH SAME TYPE AND RATING.
INPUT
250V PEAK
!
LINE RATING
50-60HZ
50VA MAX
AC ONLY
LINE FUSE
SLOWBLOW
1/2A 90-125V
1/4A 180-250V
IEEE-488
(CHANGE IEEE ADDRESS
WITH FRONT PANEL MENU)
DIGITAL
I/O
TRIG LINK
1
15V
LO
HI
RS232
!
MADE
IN
U.S.A.
PREAMP OUT
250 PEAK
COMMON
2V ANALOG
OUTPUT
TEMP
TYPE K
HUMIDITY
OPTION SLOT
V SOURCE
EXT TRIG
IN
MTR COMP
OUT
INTERLOCK
SELECTED
LINE VOLTAGE
90-110V
105-125V
180-220V
210-250V
1010V
PEAK
750V
PEAK
Model 6517
INPUT Connector
(cleaning: para. 1.4)
Line Voltage Selector Switch
(Setting: para. 1.2)
Line Fuse
(Replacement: para. 1.3)
Figure 4-1
Rear panel
4.5
Firmware updates
It is possible that you may receive a firmware update from
Keithley to enhance operation. The firmware for the main
microprocessor is contained in two ROMs (U637 and U638)
installed in sockets on the digital board to make replacement
relatively easy.
The replacement procedure requires that the case cover be
removed, and these static-sensitive devices require special
handling. As a result, the firmware update procedure should
be performed only by qualified service personnel. The proce-
dure to replace the ROMs is located in paragraph 6.7.