Troubleshooting The Instrument - Teledyne 8800T Instruction Manual

8800T User's Manual
the current loop output, refer to appendix G.
9. Lock/Unlock the instrument : This mode is used to
block access to parameter settings, protecting the instru-
ment from unauthorized or inadvertent changes of
parameters. Attempting to change settings while instru-
ment is locked will display
To unlock the instrument press the UP button, to lock
the instrument press the DOWN button. Pressing the
MODE button will navigate back to the Select Alternate
Display Units mode.
Pressing and holding either the UP or DOWN button,
will save the lock or unlock setting depending on the
button, and reset the instrument. This feature is useful if
it is difficult to power off the instrument.
Note: It is imperative that one returns the instrument to
the locked mode to avoid unauthorized changes.

3.5 Troubleshooting the Instrument

This instrument performs diagnostic tests on power up as
well as once every two minutes. The table that follows,
depicts all possible error/unexpected messages that may be
displayed on the instrument. For each message the table has
explanations for the reason, and if necessary a suggested
action to remedy it.
page 28