Tektronix 2247A Operator's Manual page 105

Operator Checks and Adjustments
Introduction
The checks and adjustments in this section are for the operator and involve
using only controls and adjustments on the outside of the Instrument.
Internal adjustments must be made by a qualified service person.
Before operating the Instrument for the first time and before connecting the
power, refer to Section 1 "Preparation for Use" to prepare the instrument
for the Initial start-up.
Verify that the POWER switch Is OFF (out position). Plug the power cord
into a power-source outlet that supplies a voltage within the operating
range of the instrument's power supply.
NOTE
If you notice an improper indication or instrument mal-
function during these procedures, refer the instrument to a
qualified service person.
Initial Setup
The following procedure may be used to set up front-panel controls when
the instrument is first turned on or when a signal is not being applied to the
Input connectors.
1. Press In the POWER switch button (ON) and let the Instrument warm up
(20 minutes Is recommended for maximum accuracy).
2. Set the instrument front-panel controls to obtain a baseline trace:
Vertical Controls
VERTICAL MODE CH 1
POSITION Center the trace
VOLTS/DIV 1Vv
VOLTS/DIV VAR Calibrated detent
Channel 1 COUPLING GND
2247A Operators 4-1