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66 34980A User’s Guide
2 Features and Functions
Self-Test
A power- on self-test occurs automatically when you turn on the
instrument. This limited test assures you that the instrument and all
installed plug-in modules are operational. This self-test does not perform
the extensive self test described below.
A complete self-test actually performs a series of internal tests and takes
approximately 20 seconds to execute. If all tests pass, you can have high
confidence that the instrument and all installed plug- in modules are
operational. This feature is available from the remote interface only.
• If you have a 34951A Isolated DAC Module installed, the complete
self- test will require an additional 15 seconds to complete per DAC
module (a memory test is performed).
• The complete self-test will abort if any signals are connected to ABus1
via the rear- panel Analog Bus connector (pins 4, 5, and 9; see “Analog
Buses” on page 15). Be sure to disconnect any signals from ABus1 prior
to running the self-test.
• If the power-on or complete self-test fails, and error is stored in the
error queue. See the Agilent 34980A Service Guide for more
information on returning the instrument to Agilent for service.
• Following the complete self-test, the instrument issues a Factory Reset
(
*RST command).
Remote Interface Operation: The following command returns “+0” if the
self- test is successful or “+1” if it fails.
*TST?
Front-Panel Display Control
For security reasons or for a slight increase in measurement rates,
you may want to turn off the front-panel display. From the remote
interface, you can also display up to 18 characters on the upper line
of the front-panel display.
• You can disable the front-panel display only by sending a command
from the remote interface (i.e., you cannot disable the front panel while
in local operation).
• When disabled, the entire front-panel display goes dark and all display
annunciators except ERROR, HOT, and Safety Interlock are disabled.
• The front-panel display is automatically enabled when power is cycled,
after a Factory Reset (
*RST command), or after an Instrument Preset
(SYSTem:PRESet command).