GW Instek GOS-6000 Series - Manual (Page 14)

GOS-6051/6050/6031/6030 OSCILLOSCOPE
USER MANUAL
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will be displayed.
Use this mode when effecting synchronization to a very low frequency
signal (25Hz or less).
(31)SOURCE—Pushbutton
Pressing the pushbutton to select the trigger signal source. The actual
setting is indicated by the readout (“SOURCE”, slope, coupling).
Each time when the pushbutton is pressed, the trigger source change in the
sequence:
VERT—CH1—CH2—LINE—EXT—VERT
VERT (Vertical Mode)
For observing two waveforms, the sync signal changes alternately
corresponding to the signals on CH1 and CH2 to trigger the signal.
CH1
The signal applied to the channel 1 input connector is the source of the
trigger signal.
CH2
The signal applied to the channel 2 input connector is the source of the
trigger signal.
LINE
The triggering signal is obtained from a sample of the AC power source
waveform. The trigger source is useful when the displayed waveform
frequency is time related to the AC power source frequency.
EXT
The external signal applied through the EXT input connector is used for
the external triggering source signal.
GOS-6051/6050/6031/6030 OSCILLOSCOPE
USER MANUAL
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(32)TV—Pushbutton for video sync signal selection
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 pushbutton. The current setting is displayed in the
readout under item (source, video polarity, “TVV or TVH”). Each time
when the pushbutton is pressed, the video sync signal is displayed in the
sequences as follows:
TV-V—TV-H—OFF—TV-V
TV-V
Start the main trace at the beginning of a video signal field. The polarity
must match the composite sync polarity (i.e, “ ” for negative sync) to
obtain TV field triggering on the vertical sync pulse.
TV-H
Start the main trace at the beginning of a video signal line. The polarity
must match the composite sync polarity to obtain TV line triggering on the
horizontal sync pulse.
(33)SLOPE—Pushbutton for the triggering slope.
Briefly pressing the pushbutton to select the slope of the signal which is
used for triggering the time base generator. Each time when the pushbutton
is briefly pressed, the slope direction will switch from falling edge to
rising edge, and vice versa.
The current setting is displayed in the readout under item “source, SLOPE,
coupling”.
If in the TV trigger mode, it is synchronized only when the sync signal is
negative. A “ ” symbol is displayed in the readout.