Tektronix 2252, Operator'S Manual, Page: 24 / 114

Introduction
The detachable three-wire power cord has a three-contact plug for con­
nection to the power source and the protective ground. The power cord is
held to the rear pane! by a dam p. The protective ground contact on the plug
connects (through the power cord protective-ground conductor} to the
accessible metal parts of the instrument.
WARNING
For electrical-shock protection, insert this plug into a power-
source outlet that has a properly grounded protective-ground
co n ta c t
instrument Cooling
To prevent instrument damage from overheated components, make sure the
interna! airflow is not blocked. Before turning on the power, check that the
ventilation holes on the bottom and side of the cabinet are not covered.
Start-up
At power on, the instrument does a self-diagnostic check, if the instrument
does h ot turn on and operate normally, turn power off then on again. If the
instrument still does not turn on properly, refer the instrument to a qualified
service person. TRIGGER MODE LEDs may be flashing to indicate the circuit
location of a start-up error; you should report this information to the service
person.
When the instrument is turned on, a seif-ca! routine may run to set the
voltage- and timing-measurement constants. The power-on seif cal runs
only if the stored constants have been lost, possibly due to a dead memory
back-up battery. The following warning message will be displayed for 5
seconds: “WARNING PROBABLE BATTERY FAILURE TURN OFF AND ON
TO VERIFY” . If the message reappears after having turned the power off and
on, have the battery checked and/or repiaced by a qualified service person.
The instrument can still be used for accurate measurements by running the
SELF CAL MEASUREMENTS routine from the SERVICE MENU after the
instrument has warmed up for at least 20 minutes.
To run the SELF CAL MEASUREMENTS routine, press the top and bottom
menu-item select buttons. Press down-arrow button to underline SELF CAL
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2252 Operators