Digalog Systems 2040D Series Manuale utente
Series 2040D Test Systems
2040D
Maintenance
Manual
Part Number #4200-0181
Version 1.0
Table Of Contents
System Overview......................................................................................... 3
SYSTEM MAINTENANCE OVERVIEW ................................................ 5
Selftest & Calibration .................................................................................. 7
SELFTEST AND CALIBRATION OVERVIEW........................................ 8
Purpose Of Calibration ........................................................... 8
When To Calibrate .................................................................. 8
SELFTEST........................................................................................... 9
Selftest Failure Analysis ......................................................... 14
CALIBRATION ................................................................................. 16
Diagnostics................................................................................................ 19
DIAGNOSTIC TOOLS ..................................................................... 20
SelfTest EXaminer (STEX) for Microsoft Windows 95 ......................... 20
Overview.............................................................................. 20
Creating the Diagnostic File for STEX ..................................... 20
Analyzing Selftest Data .......................................................... 21
TRMAN (Tester Resource Manager) .................................................. 25
Menu Bar ............................................................................. 25
TESTHEAD - PATCHBOARD - UUT P/S BUILT-IN DIAGNOSTICS .... 31
Breakers and Test Points ........................................................ 32
LED Indicators ...................................................................... 32
GPIB/HPIB POWER SUPPLIES ......................................................... 37
Troubleshooting Hewlett-Packard Power Supplies.................. 37
Certification .............................................................................................. 43
CERTIFICATION .............................................................................. 45
Setup .................................................................................... 45
Module Repair & Replacement ................................................................. 49
REPAIR AND REPLACEMENT PROCEDURES ................................... 50
COMPUTER ASSEMBLY ........................................................ 51
INTERNAL AND PATCHBOARD P/S OVERVIEW ............................. 52
TESTHEAD & PATCHBOARD P/S REPLACEMENT ................. 53
+5VDC Testhead Power Supply ............................................ 54
UUT POWER SUPPLIES - Description.............................................. 56
UUT POWER SUPPLY CONTROLLER REPLACEMENT .......... 57
UUT POWER SUPPLIES........................................................ 58
GPIB/HPIB POWER SUPPLIES .............................................. 59
UUT - GPIB/HPIB P/S DISCONNECT AT TEST BAY ............... 60
CIRCUIT BOARD REPLACEMENT ................................................... 61
CONTACT SPRING REPAIR ............................................................. 63
USE OF PATCHBOARD SPRING REMOVAL TOOL (0000-2746)...... 64
CONTACT SPRING REPLACEMENT (Conventional Method) . 65
Series 2040 Test System
Series 2040 Maintenance Manual V2.00 Maintenance Overview
3
System Overview
Series 2040 Test System
Series 2040 Maintenance Manual V2.00Maintenance Overview
4
Series 2040 Test System
Series 2040 Maintenance Manual V2.00 Maintenance Overview
5
SYSTEM MAINTENANCE OVERVIEW
The Series 2040 Test System has been designed with extensive diagnostics and
self testing capabilities. Each module and circuit board includes additional
circuitry for calibration and self testing programs. In addition, a Selftest
Assembly is provided to calibrate and functionally test every component in the
test system. This assembly attaches to the fixture interface to provide the best
accuracy and reliability for calibration and self-diagnostics.
The Certification program uses a Calibration station containing a Digital
Voltmeter (DVM) and Universal Counter/Timer, which are certified by the
National Institute of Standards and Technology as a “Transfer Standard,” to
calibrate the internal precision references of the tester. The Selftest Assembly
uses a 18-bit D/A converter (TDAC) as an internal precision voltage standard.
The internal precision time standard is a Temperature Compensated Crystal
Oscillator located on the Time Measurement System board.
The Calibration and Selftest routines calibrate the remainder of the system to
the tester’s internal precision references. Calibration constants are derived
during Calibration. These constants are used during runtime to maintain
system accuracy. The Calibration constants are stored on the hard drive and
reloaded at powerup. Complete system auto-calibration is achieved without
any pots to adjust.
The Selftest programs use the Selftest Assembly to test all circuits to their
published specifications, and assure that all paths and modules are functional.
The System Maintenance guide is written for troubleshooting to the module
and circuit board level.
The tester shall be disconnected from all power sources
before it is opened for any adjustment, replacement,
maintenance or repair. If service repairs performed under
power become necessary, the repairs shall be performed
by a skilled technician who is aware of the hazard
involved.
Series 2040 Test System
Series 2040 Maintenance Manual V2.00Maintenance Overview
6
Series 2040 Test System
Series 2040 Maintenance Manual V2.00 Selftest & Calibration
7
Selftest & Calibration
Series 2040 Test System
Series 2040 Maintenance Manual V2.00Selftest & Calibration
8
SELFTEST AND CALIBRATION OVERVIEW
Calibration on the Series 2040 Functional Test System is completely
automated. All calibration is based on high precision references built into the
system Testhead and the Selftest Assembly. A high precision Temperature
Compensated Crystal Oscillator (TCXO) on the Time Measurement System
Board (TMS) is used as a frequency/time reference. A precision digital to
analog converter (TDAC) contained within the Selftest Assembly is used as a
voltage reference for system calibration.
Purpose Of Calibration
Calibration of the functional tester is necessary to obtain gain and offset terms
for all signal paths that exist within the system, and to determine timing for the
MDE’s (Measurement Display Electronics) sweeps, delays, triggers, and
measurement mark. Since potentiometers are used in only a few instances
where factory calibration is required, the majority of the calibration is done by
taking measurements and calculating calibration terms which can be
referenced at a later time. These terms are used by the hardware functional
calls to account for gains, offsets, and timing discrepancies, and their use is
transparent to the user.
In all calibration programs, limits are set on what values any given calibration
term may take on. If a calculated value is outside of the allowable range, a
failure will result and be displayed/printed to the designated output device .
When To Calibrate
Selftest is the best guide to determine if calibration is required. The battery of
Selftest programs is designed to test all functions of the 2040 to their
specifications. If any failures occur during Selftest (especially borderline
failures), calibration should be carried out before proceeding to troubleshoot
the system.
Running through Selftest periodically can tell you if calibration is or is not
required. If you find that all Selftest programs run without failures, there is no
need to recalibrate any portion of the tester. The recommended guideline is to
calibrate every 3 months.
Whenever a temperature change of more than five (5) degrees Celsius occurs
or a Testhead board swap is made, the 2040 should be recalibrated.
Series 2040 Test System
Series 2040 Maintenance Manual V2.00 Selftest & Calibration
9
SELFTEST
Selftest on the Series 2040 Test System is an automated procedure. The
programs that comprise Selftest are organized under the Selftest Executive in a
test menu called “Functional”. These programs exercise the hardware
functions available to the user through the hardware functional calls. To
perform Selftest, proceed as follows:
1) Install the Selftest unit on the Patchboard assembly as shown
below:
A) Pull the locking handle towards the front of the unit until it
is vertical.
B) Slide the pins on the rear of the Selftest unit into the
Patchboard and rotate the Selftest unit forward until it is
vertical, and sets into the Patchboard.
C) The ribbon assembly should be installed in the receptacle
behind the Selftest, with the colored edge of the ribbon on
the left side, while viewing the front of the unit.
D) Rotate the locking handle back to it’s original position to
lock the Selftest into place.
2) Enter the Selftest Executive by selecting (double-clicking on) the
“SelfExec” program from the Windows Explorer. The Selftest
Executive menu will be displayed as shown on the next page.
3) From the File menu, select Configure, and the small “Report
Indice
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