Operating Environment; Operating Temperature; Ventilation Requirements; Applying And Interrupting Power - Tektronix 420 Service Manual

Installation
Operating
Environment
Applying and
Interrupting Power
2 4
The following environmental requirements are provided to ensure proper
operation and long oscilloscope life.

Operating Temperature

Operate the oscilloscope where the ambient air temperature is between 0 _ C
and +50 _ C, and store the oscilloscope at an ambient temperature from
–40 _ C to +75 _ C. After storage at temperatures outside the operating limits,
allow the chassis to stabilize at a safe operating temperature before applying
power.

Ventilation Requirements

The digitizing oscilloscope is cooled by air drawn in and exhausted through its
cabinet side panels by an internal fan. To ensure proper cooling of the
oscilloscope, allow at least two inches clearance on both sides and
the bottom of the digitizing oscilloscope. (The feet on the bottom of the
oscilloscope provide the required clearance when set on flat surfaces.) The
top of the oscilloscope does not require ventilation clearance.
If air flow is restricted, the power supply of the digitizing
oscilloscope may temporarily shut down.
Consider the following information when you power up or power down the
oscilloscope, or when power is interrupted due to an external power failure.

Power-Up

Upon power-up, the oscilloscope runs its power-on self check. If the self
check passes, the oscilloscope displays a "passed" status message and a
prompt to press CLEAR MENU to continue. If the self check fails, the oscillo-
scope displays a diagnostic log that identifies the area(s) that failed and a
prompt to press CLEAR MENU to continue. See Section 6, Maintenance , for
information on diagnostics and fault isolation.
CAUTION
Operating Information
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