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Controls, Connectors, and Indicators

readout. Whenever A MODE is selected, the A/B SELECT switch is

set to A Trigger.

ALT—Alternates between A sweep (with an intensified zone repre

senting B sweep) and B delayed sweep. Both A and B SEC/DIV switch

settings are displayed in the crt readout, but only the B can be

adjusted. Whenever ALT MODE is selected, the A/B SELECT switch

is set to B Trigger.

The B sweep speed cannot be set slower than the A sweep speed;

attempting to do so forces the A sweep speed to follow the B sweep

speed. To increase the A sweep speed in the ALT MODE, set the

Horizontal MODE to A, adjust the SEC/DIV switch to a faster A sweep

setting, and reset the Horizontal MODE switch to ALT. The B sweep

speed and the length of the intensified zone are determined by the B

SEC/DIV switch setting.

B—Selects B sweep horizontal deflection. The B sweep speed is de

termined by the B SEC/DIV switch setting as displayed in the crt

readout. Whenever B MODE is selected, the A/B SELECT switch is

set to B Trigger.

The start of the B sweep in RUNS AFTER mode (or the arming of the

B Trigger in any triggered mode) is delayed from the start of the A

sweep by a time determined by the setting of the |<- OR DELAY con

trol. The B SEC/DIV switch setting and the Delay Time Position set

ting are displayed in the crt readout. A greater-than sign (>) is dis

played 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-Axis).

The X-Y displays are horizontally positioned by the Horizontal POSI

TION control and vertically positioned by the associated vertical chan

nel POSITION control.

(2?) A AND B SEC/DIV Switch—Selects the horizontal deflection rate

(sweep speed) for both the A sweep and tht. 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 Horizontal MODE.

2245A Operators

2-9

Tektronix 2245A User Manual

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