What Does the Auto Setup on the Mixed Signal Oscilloscope Do?

What Does the Auto Setup on the Mixed Signal Oscilloscope Do?

When you perform auto setup, the mixed signal oscilloscope (MSO) senses the input signal and automatically chooses many of the instrument settings.

If a signal is detected on an analog channel, the software chooses the smallest available vertical range that is larger than the signal range, and an offset to center the waveform within that range. For example, if the signal is a 1.2 V_pk-pk sine wave, the software will choose the 2 V vertical range for that channel. An analog channel is considered to have a signal present if the signal is at least 10% of the smallest vertical range available for that channel and vertical offset.

If a signal is detected on a digital channel, then the software enables that channel.

If a signal is detected on at least one analog channel, then the lowest-numbered analog channel with a signal will be used as the Analog Edge trigger, and the sample rate and acquisition time will be optimized for that channel.

If no signals are detected on analog channels but signals are detected on digital channels, then the digital channel with a signal with the fewest toggles will be used as a Digital Edge trigger, and the sample rate and acquisition time will be optimized for the digital channel with the most frequently toggling signal.

If no signal is detected on any analog or digital channels, all settings configured by Auto Setup are placed in the default configuration. If you are using LabVIEW, a warning is also returned.

Details

The following settings may be changed during an auto setup:

Analog Channels

• Channel Enabled: Changed by Auto Setup
• Vertical Coupling: Unchanged by Auto Setup
• Probe Attenuation: Unchanged by Auto Setup
• Vertical Offset: Changed by Auto Setup
• Vertical Range: Changed by Auto Setup

Digital Channels

• Channel Enabled: Changed by Auto Setup

Timing

• Sample Rate: Changed by Auto Setup
• Acquisition Time: Changed by Auto Setup
• Pretrigger Time: 50% of Acquisition Time
• Sampling Mode: Sample

Triggering

• Trigger Type: Analog Edge, Digital Edge, or Immediate (if no signal present)
  • Analog Edge (if Trigger Type is Analog Edge)
    • Trigger Source: Lowest numbered channel with signal present
    • Trigger Slope: Rising
    • Trigger Level: 50% of signal on trigger channel
  • Digital Edge (if Trigger Type is Digital Edge)
    • Trigger Source: Channel with fewest transitions greater than zero
    • Trigger Slope: Rising

Advanced Digital Timing

• Digital Sample Rate Control: Automatic
• Buffer Control: Automatic

Digital Threshold

• Threshold: Unchanged by Auto Setup

State Mode

• Enabled: False