GW Instek GOS-6100 Series - Manual (Page 15)

GOS-6112 OSCILLOSCOPE
USER MANUAL
 23 
(28)COUPLING –Pushbutton and indicator LEDs.
Pressing the pushbutton to select the trigger coupling. The actual
setting is indicated by a LED and by the readout (“source, slope, AC”).
Each time when the COUPLING pushbutton is pressed the trigger
coupling changes in the sequence:
AC—DC—HFR—LFR
AC
Attenuates trigger signal frequency components below 10Hz and
blocks the DC component of the signal.
AC coupling is useful for triggering on AC waveforms that have a
large DC offset.
DC
Couples DC and all frequency components of a triggering signal to the
trigger circuitry.
DC coupling is useful for most signals, especially for providing a
stable display of low-frequency or low-repetition-rate signals.
HFR (High Frequency Reject)
Attenuates high-frequency triggering signal components above 40kHz.
HFR coupling is useful for providing a stable display of low-frequency
components of complex waveforms and eliminates high-frequency
interference from the trigger signal.
LFR (Low Frequency Reject)
Attenuates low-frequency triggering signal components below 40kHz
and blocks the DC component of the trigger signal.
LFR coupling is useful for producing stable triggering on the
high-frequency components of complex waveforms and rejecting
low-frequency interference or power supply hum from the trigger
signal.
GOS-6112 OSCILLOSCOPE
USER MANUAL
 24 
(29)SOURCE—Pushbutton and associated LEDs.
Pressing the pushbutton to select the trigger signal source or the X
signal for an X-Y operation. The actual setting is indicated in a LED
and by the readout (“SOURCE”, slope, coupling).
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. When in the dual X-Y
operation, the X-axis operates with the external signal.