Trigger controls – GW Instek GOS-6100 Series User Manual

Page 14

GOS-6112 OSCILLOSCOPE

USER MANUAL

 21 

Trigger controls

The trigger controls determine the sweep start timing for both signal and

dual trace operation.

TRIGGER

LEVEL

SOURCE

DELAY TIME

SLOPE

ATO

NML

MODE

TV-V/
TV-H

COUPLING

LFR

HFR

CH2

CH1

EXT

(26)MODE – Pushbutton and indicator LEDs.

Pressing the pushbutton to select the trigger mode. The actual setting

is indicated by a LED.

Each time when the MODE pushbutton is pressed the trigger mode

changes in the sequence:

ATO—NML—TV—ATO

ATO (Auto)

Select the automatical mode, the sweep free-runs will display a

baseline trace when there is no trigger signal or the frequency is below

10Hz. The setting of triggering level changed only when the TRIGGER

LEVEL control is adjusted to a new level setting.

GOS-6112 OSCILLOSCOPE

USER MANUAL

 22 

NML (Normal)

Select the normal mode, the input signal will trigger the sweep when

the TRIGGER LEVEL control is set within the peak-to-peak limits of

an adequate trigger signal. When the sweep is not triggered, no

baseline trace will be displayed.

Separate the video sync signal from the composite waveform and

direct it to the triggering circuit. The horizontal or vertical sync signals

are selected by TV-V/TV-H pushbutton. Please refer to the

TV-V/TV-H (31).

(27)LEVEL—Control knob

Turning the control knob causes a different trigger input setting

(voltage), and set to a suitable position for the starting of triggered

sweep of the waveform. An approximate trigger level setting (voltage)

value will be displayed in the readout. When rotate clockwise the

control knob, the trigger point moves toward the positive peak of the

trigger signal and rotate it counterclockwise to move the trigger point

toward the negative peak of the trigger signal.

When the setting (voltage) value is out of the changing portion of the

observation waveform, the synchronization sweep stops. Sometimes a

“?” will be displayed on the left of the valued display, that indicates

that direct reading is impossible if AC, HFR, LFR coupling or VAR of

vertical deflection is set.