Fluke 900 - Manual (Page 79)

FLUKE 900 SERVICE MANUAL Maintenance
5 Maintenance
5.1 Performing a Complete System Checkout
The Basic Functional Test is built into the system software as the power on selftest, which takes
about 1 minute.
Power the Fluke 900 up by setting the power switch to position "1".
Monitor results of the built-in selftest. It should pass and proceed to the initial screen.
Qieck the System Firmware Revision indicated at the bottom of the LCD display. All
systems should have version 4.09 or higher. Systems with the Simulation Option
(900-001) must have version 5.05 or higher. All systems can have the Learn feature
and extended FMask and Threshold ranges when fitted with System Firmware
Revision 6.00 or higher. The most current Library Finnware Revision (as of January
1992) is 6.00. It has only minor device additions to version 5.00, the recommended
minimum.
The Extended Functional Test checks features which cannot be tested during the power up
selftest (eg. RS232), or which have LED visual display only.
Put the Fluke 900 into debug mode (refer to Section 1.2 for instructions).
Run test 50 (RS232) to verify that it passes. Note that no external device should be
connected to the RS232 port during this test.
Run test E60 to check the size LEDs with walking 1 and 0 patterns.
Run test E62 to check the monitor LEDs with walking 1 and 0 patterns.
Run test E76 to verify test cycle control. Ignore failures in BYTEl of the test results.
The following procedure wiU register the limits of the power supply output voltage.
From debug mode run test E63 continuously for as long as monitoring is required
(usually about 5 minutes).
Stop the execution of the test by pressing any key. It will not display voltage results on
this menu, but will on the Engineering Menu as explained below. Return to the main
screen by pressing (^m) three times.
Bring up the special Engineering Menu by simultaneously pressing and an
unlabelled keyswitch found between LNEyrJ and I tectj , Press 0)(Vcc) and the upper
and lower voltage limits will be displayed, as they are measured on the Interface
Buffer.
Vcc should be between 5.00 and 5.04 volts.
5-1