Tektronix MSO4000/DPO4000 series digital fluorescence oscilloscope

Set the threshold according to [Thresholds] (such as TTL 1.4V, 3.3V CMOS 1.65V);

Press MagniVu → On to enable 60.6ps timing resolution (for precise measurement of digital edges).

Core functional system

1. Collection system (5 modes)

The working principle of the collection mode is applicable to different scenarios

Sample: equidistant sampling, 1 point/interval regular stable signal (sine wave/square wave), strong real-time performance

Peak Detect records the maximum/minimum value of each interval to capture narrow spikes (≥ 1ns), effective at low-speed time base (≥ 5 μ s/div)

Hi Res (High Resolution) calculates the average value of each interval sample to reduce noise and improve the resolution of low-frequency signals

Envelope records the maximum/minimum waveform collected multiple times, observing the range of signal amplitude changes (such as power ripple fluctuations)

Average: After multiple acquisitions, the average (4/16/64/128 optional) suppresses random noise, and averaging 128 times can significantly improve the signal-to-noise ratio

2. Trigger system (8 types)

Trigger type key parameters applicable scenarios

Edge slope (rising/falling), coupling (DC/LF Reject/HF Reject), stable display of conventional signals (such as clock, square wave)

Pulse Width condition (>/</=/≠), width (33ns-10s), polarity capture of abnormal pulses (such as narrow pulse interference in communication links)

Logic channel status (High/Low/Don't Care), clock edge multi-channel logic combination triggering (such as I2C SDA=1 and SCL=0)

Setup&Hold: Clock channel, data channel, violation time detection bus timing violation (such as insufficient setup time between FPGA and memory)

Bus type (I2C/CAN/RS-32, etc.), trigger conditions (address/data/error), decode and trigger bus specific events (such as Write operation for I2C address 0x7F)

3. Measurement and analysis functions

Automatic measurement: Supports 11 types of parameters, with a maximum of 8 displayed simultaneously. The key measurements are as follows:

Measurement type definition accuracy conditions

The amplitude of the reciprocal signal of the first cycle of frequency (Freq) is ≥ 1div, without any truncation

Rise Time: The time signal with an amplitude of 10% -90% has no noise on the rising edge and is horizontally scale adapted (such as 10ns/div)

Peak to peak value (Pk Pk) full waveform maximum minimum value waveform without truncation, vertical scale adaptation (such as 100mV/div)

FFT spectrum analysis:

Press 【 Math 】 → 【 FFT 】, select the source channel (such as CH1);

Press [Window] to select the window function (Rectangular: optimal frequency resolution; Blackman Harris: excellent amplitude accuracy);

Select dBV RMS/Linear RMS according to 'Vertical Units' (dBV RMS is suitable for multi frequency comparison);

Histogram analysis:

Press 【 Measure 】 → 【 Waveform Histograms 】, select Vertical (voltage)/Horizontal (time);

Set the boundary of the rectangular frame (Horizon. Limits/Vert. Limits) and add statistical measurements (such as σ 1/σ 2/σ 3);

Vertical histograms are used to measure noise (the smaller the σ value, the lower the noise), while horizontal histograms are used to measure jitter.

Data Management and Communication

1. Storage medium operation

Storage content operation steps, file name format, 1MB capacity, approximate storage quantity

Waveform file 1. Press 【 Save/Recall 】 → 【 Save Waveform 】; 2. Select [To File] → [Internal File Format (. ISF)]; 3. Edit file name tekXXXX_Cx.ISF (x=1-4) 18 (10M point waveform)

Set file 1. Press 【 Save/Recall 】 → 【 Save Setup 】; 2. Select [To File] or [To Setup 1-10]; 3. Confirm to save 250 units of tekXXXXX.SET

Screen Image 1. Press 【 Save/Recall 】 → 【 Save Screen Image 】; 2. Select format (. BMP/. TIF/. PNG); 3. Press [OK Save] tekXXXXX.BMP 16

2. Remote communication settings

Ethernet（e*Scope）：

Connect the Ethernet cable to the rear panel LAN port, press 【 Utility 】 → 【 I/O 】 → 【 Ethernet Network Settings 】;

Set DHCP to On (automatically obtain IP) or Off (manually set IP);

Input the oscilloscope IP into the PC browser and access the e * Scope interface to control the oscilloscope;

USBTMC (PC Control):

Connect the Rear panel USB Device port of the oscilloscope to the PC using a USB cable;

Install VISA driver (official website download), and send SCPI command through LabVIEW/Excel on the PC end;

Application modules and case studies

1. Optional application modules

Module model, function, applicable scenarios

DPO4PWR power analysis: power quality, switching losses, harmonics, safe working area (SOA) power supply design (such as AC-DC converter efficiency testing)

DPO4USB 2.0 decoding: low-speed/full speed bus triggering and decoding, supporting PID error detection and USB device debugging (such as troubleshooting USB disk enumeration failures)

DPO4AUTO Automotive Bus: CAN/LIN triggering and decoding, supporting frame type/ID filtering for automotive electronics (such as CAN bus communication faults)

DPO4VID video trigger: HDTV (such as 1080i), custom video (3-4000 lines), video equipment (such as monitoring camera signal testing)

2. Typical troubleshooting cases

Case 1: Abnormal RS-232 bus