Keithley 2520, Service Manual, Page: 40 / 137

2-10 Calibration Model 2520 Pulsed Laser Diode Test System Service Manual
Testhead connections
The Model 2520 mainframe must be connected to the testhead in order to perform
calibration. Using
Figure 2-1 as a guide, make testhead connections as follows:
CAUTION Make sure power is turned off before making connections.
• Connect mainframe TESTHEAD CONN 1 to testhead MAINFRAME CONN 1.
• Connect mainframe TESTHEAD CONN 2 to testhead MAINFRAME CONN 2.
• Short pins 1 and 9 of the REMOTE INTERLOCK connector. Insert the key in the
KEY INTERLOCK and rotate to the ENABLED position to enable operation.
WARNING Shorting interlock connectors will disable the interlock. Use caution to
avoid live contacts when performing calibration.
NOTE Both interlocks must be enabled to perform calibration.
Figure 2-1
Testhead connections
TRIGGER LINK
PULSE
SYNC
OUT
TESTHEAD
CONN 1
LINE FUSE
SLOWBLOW
1.6A, 250V
LINE RATING
100-240VAC
50, 60Hz
140VA MAX.
TESTHEAD
CONN 2
CAT I
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.
MADE IN
U.S.A.
!
IEEE-488
(CHANGE IEEE ADDRESS
WITH FRONT PANEL MENU)
DIGITAL I/O
RS-232
!
!
ENABLED
DISABLED
(PULL TO
REMOVE)
1 9
ENABLED
DISABLED
BOTH INTERLOCKS MUST BE ENABLED TO OPERATE
!
MAINFRAME
CONN 1
MAINFRAME
CONN 2
REMOTE
INTERLOCK
INTERLOCK
STATUS
LASER
POWER
ON
GREEN=ENABLED
RED=DISABLED
KEY
INTERLOCK
Model 2520 Mainframe
Model 2520 Testhead
CONN 2 Cable
CONN 1 Cable
Front panel calibration
The front panel calibration procedure described below calibrates all functions. Note that
each function and range is separately calibrated, and the procedure must be performed in
the order shown.