TDS310 datasheet(79/242 Pages) ETC2

79 / 242 page

Triggering

TDS 310, TDS 320 & TDS 350 Instruction Manual

327

H Press Noise Reject to select noise reject mode. Noise rejection provides

DC low sensitivity, but it requires additional signal amplitude for stable

triggering.

Change Trigger Slope

Press the main menu button Slope. Use the top

two side menu buttons to switch between positivegoing and negativegoing

slope.

Adjust Trigger Level

Press the main menu button Level. Use the side

menu to select from these options.

H Use the General Purpose Knob to adjust trigger level. (Note that this

selection performs the same function as the trigger LEVEL knob on the

front panel.)

H Press Set to TTL to automatically set the trigger level to the TTL switch

ing threshold.

H Press Set to ECL to automatically set the trigger level to the ECL switch

ing threshold.

H Press Set to 50% to set the trigger level to the midpoint of the trigger

source signal. (Note that this selection performs the same function as the

SET LEVEL TO 50% button on the front panel.)

Select Trigger Mode

Press the main menu button Mode. Use the side

menu to select either Auto or Normal mode.

In normal trigger mode, the oscilloscope waits for a valid trigger from the

trigger signal source. In auto trigger mode, the oscilloscope produces an

internal trigger in the absence of other trigger events.

At horizontal scale settings of 100 ms per division and slower, auto trigger

mode switches to an untriggered roll display. When the display is in roll"

mode the envelope and average acquisition modes does not work properly,

and the display does not show a trigger T" on the waveform.

Adjust Holdoff

Press the main menu button Holdoff to activate the

General Purpose Knob. Use the knob to adjust holdoff; the TDS 300 Series

have a holdoff range of 500 ns to 10 s. Press the side menu button Set to

Min to quickly set the holdoff to 500 ns.

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