Tektronix 2247A

Controls, Connectors, and Indicators
setting are displayed In the crt readout. A greater-than sign (>) Is
displayed In front of the Delay Time readout if the B Trigger MODE Is
not RUNS AFTER.
X-Y—The signal applied to CH 1 OR X Input connector produces the
horizontal (X-Axis) deflection. Signals applied to any vertical input
connector or ADD may be selected to provide the vertical deflection
(Y-Axls).
The X-Y displays are horizontally positioned by the Horizontal
POSITION control and vertically positioned by the associated vertical
channel POSITION control.
A AND B SEC/DIV Switch—Selects the horizontal deflection rate
(sweep speed) for both the A sweep and the B sweep in a 1-2-5
sequence. Calibrated sweep speeds are obtained with the A and B
SEC/DIV VAR control In the detent (fully clockwise) position. The A
SEC/DIV switch setting Is set only from the A Horizontal MODE and
the B SEC/DIV switch is set only from the ALT or B Horlzontal MODE.
NOTE
The 8 sweep speed can never be slower than the A sweep
speed. When the two sweep speeds are the same, they are
“locked.” At this point A will follow B to slower SECIDIV
settings (in ALT or B) and B will follow A to faster settings
(in A).
A SEC/DIV—The calibrated A sweep speed Is selected only in A Hori-
zontal MODE from 0.5 s per division to 20 ns per division (X10 MAG
off).
B SEC/DIV—The callbrated B sweep speed Is selected either In ALT
or B Horizontal MODE from 5 ms per division to 20 ns per division (X10
MAG off).
A and B SEC/DIV VAR Control—Provides continuously variable,
uncalibrated A and B sweep speeds to at least 2.5 times slower than
the callbrated SEC/DIV setting.
The VAR control extends the slowest A sweep speed to at least
1.25 sec per division. The UNCAL indicator Is lit and a greater-than
sign (>) Is displayed before each SEC/DIV readout value when the
sweep speeds are greater than the SEC/DIV settings.
2-10
2247A
Operators