Basic Operation NOTE: Trigger coupling only affects the signal passed through the trigger system. It does not affect the bandwidth or coupling of the signal displayed on the screen. Video Trigger DSO1000B(V) Series HandHeld Oscilloscope User Manual 26 Options Settings Comments Trigger Type Edge By default the oscilloscope uses the edge trigger which triggers the oscilloscope on the rising or falling edge of the input signal when it crosses the trigger level (threshold). Source CH1 CH2 Select the input source as the trigger signal. CH1, CH2: No matter the waveform is displayed or not, a certain channel will be triggered. AC Line:
Uses a signal derived from the power cord as the trigger source. Mode Auto Normal Single Select a trigger mode. By default, the oscilloscope uses the Auto mode. In this mode, the oscilloscope is forced to trigger when it does not detect a trigger within a certain amount of time based on the TIME/DIV setting. The oscilloscope goes into the scan mode at 80ms/div or slower time base settings. In the Normal mode, the oscilloscope updates the display only when it detects a valid trigger condition. New waveforms are not displayed until they replace old ones. Use this mode to just view valid triggered waveforms. Only after the first trigger does the display appear.
Coupling AC DC Noise Reject HF Reject LF Reject Select the components of the trigger signal applied to the trigger circuitry. AC: Blocks DC components and attenuates signals below 10Hz. DC: Passes all components of the signal. Noise Reject:Attenuates the noise conponents. HF Reject: Attenuates the high-frequency components above 80kHz. LF Reject: Blocks DC components and attenuates the low-frequency components below 8kHz. 50% Set the vertical trigger postion to the channel zero level postion. Options Settings Comments Video With Video highlighted, an NTSC, PAL or SECAM standard video signal will be triggered. The trigger coupling is preset to AC.
Source CH1 CH2 Select the input source as the trigger signal. Polarity Normal Inverted Normal: Triggers on the negative edge of the sync pulse. Inverted: Triggers on the positive edge of the sync pulse. Sync All Lines Line Number Odd Field Even Field All Fields Choose a proper video sync. When selecting Line Number for the Sync option, you may use the User Select it to specify a line number. Standard NTSC PAL/SECAM Choose a video standard for sync and line number count.