Tektronix T921 Instruction Manual page 14

Operating Instructions-T921/T922/T922R
2-2
POWER-Indicator lamp lights when ON-OFF but-
ton is depressed to ON (in) position and applied
power input voltage does not vary more than about
10% from the value indicated by the 120 V/240 V and
HI/LO voltage selector switch settings . When
applied power input voltage varies more than about
10% (either high or low) from the selected value, the
lamp will blink . (In someversionsthis lamp is labeled
ON .)
O
Internal graticule-Eliminates parallax . Risetime
amplitude and measurement points are indicated at
the left edge of the graticule.
Fig. 2-1. Display front panel controls and connectors .
Rear Panel (Fig . 2-2)
Left Side of Cabinet-T921/T922 only (See Fig. 2-3)
O
ASTIG-Screwdriver adjustment used with FOCUS
control to obtain a well-defined display. Requires
little or no adjustment once set.
EXT Z AXIS INPUT-BNC connector for applying
signals to intensity modulate the crt display . Signals
'must be time-related to the display for a stable
display.
TR ROT-Trace rotation screwdriver adjustment .
Aligns trace with the horizontal graticule lines .
REV . A, JUNE 197 6