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Controls, Connectors, and Indicators

CH 1 AND CH 2 VOLTS/DIV VAR Controls—Allow the CH 1 and

CH 2 vertical deflection factors to be increased up to at least 2.5

times.

Vertical deflection factors are greater than the VOLTS/DIV switch

setting when the UNCAL indicator is lit and a greater-than symbol (>)

is displayed to the left of the associated VOLTS/DIV readout. The

VOLTS/DIV settings are calibrated when the VAR control is in the fully

clockwise (detent) position.

UNCAL Indicator—Lights when either CH 1 or CH 2 VOLTS/DIV set

ting Is uncalibrated (variable function in effect).

SCOPE BW Button—Reduces the bandwidth of the vertical deflec

tion system and trigger system to 20 MHz when the button is lit. The

full vertical deflection bandwidth is available when the SCOPE BW but

ton Is not lit.

CH 2 INVERT Button—Inverts the Channel 2 input signal when the

INVERT button is lit.

The Channel 2 input signal in ADD mode and the Channel 2 trigger

signal pickoff are also inverted. A down-arrow symbol is displayed be

tween the Channel 1 and Channel 2 VOLTS/DIV readout when the IN

VERT mode is on.

COUPLING Buttons—Select the method of coupling input signals to

the Channel 1 and Channel 2 attenuators.

GND—Disconnects the input signal and grounds the input of the asso

ciated vertical attenuator to provide a zero (ground) reference volt

age display.

The COUPLING switch is In the ground position when the AC and the

DC buttons are not lit. A ground symbol ( rh ) is displayed to the right

of the associated VOLTS/DIV readout.

AC—Capacitively couples the Input signal to the vertical attenuator

when the AC button is lit.

Turning on AC Coupling turns off DC Coupling. AC Coupling blocks the

dc component of the input signal. The lower -3 dB frequency limit is

10 Hz or less when using either a IX probe or properly terminated

coaxial cable; it is 1 Hz or less using a compensated 10X probe. With

AC Coupling selected, an AC symbol ( A; ) Is displayed to the right of

the associated VOLTS/DIV readout. An ac symbol is also displayed

after the value readout of a CURSOR VOLTS measurement.

2245A Operators

2-5

Tektronix 2245A User Manual

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