TEKTRONIX 3 Series Mixed Domain Oscilloscope MDO32 and MDO34

3. List of Testing Equipment (Table 3)

Minimum requirements for device name, example model

DC voltage source 3mV-100V, ± 0.1% accuracy Fluke 9500B (equipped with 9530 module)

Sine wave generator 9kHz-3GHz, ± 4% amplitude accuracy Anritsu MG3690C

Power meter+sensor -30dBm -+10dBm Rhode&Schwarz NRX (with NRP-Z98)

Frequency counter 0.1Hz-50MHz, 5ppm accuracy Tektronix FCA3000

Digital Multimeter (DMM) DC ± 0.1%, AC RMS ± 0.2% Tektronix DMM4040

Safety and Maintenance

1. Safety regulations

Grounding requirements: A 3-pin power cord must be used, and the grounding conductor must be reliably connected to the ground. Disconnecting the grounding is prohibited;

Input restrictions: Maximum 300VRMS (CAT II) for 1M Ω channel, maximum 5VRMS for 50 Ω channel, overvoltage may damage terminal resistance;

Operation taboos: Do not plug or unplug probes/cables with power on, do not use in damp (>90% RH) or explosive environments, and do not operate after removing the instrument cover.

2. Maintenance and Calibration

Firmware upgrade: 1 Download firmware. img from the official website to USB; 2. Turn off the oscilloscope and plug it into a USB port; 3. Automatic upgrade upon startup (power off prohibited);

Calibration cycle: recommended to be 1 year, with a reference frequency error accumulation of ± 10ppm/year (including aging and temperature effects);

Self check and diagnosis: Path: Utility → Self Test. If it fails, it will enter extended diagnosis and can be exited by pressing MENU OFF (it can be temporarily used when the fault does not affect the measurement).

Key issue

Question 1:3: The simulated bandwidth of the 3 series MDO is related to the vertical gear. What is the actual bandwidth of the 1GHz model at different vertical gears? How to confirm whether the bandwidth is qualified through performance verification?

Answer:

1、 Actual bandwidth of different vertical gears for 1GHz models

The simulated bandwidth of the 1GHz model decays with decreasing vertical gear, and the specific corresponding relationship is as follows:

Vertical gear (Volts/Div) 50 Ω input bandwidth 1M Ω input bandwidth (typical value)

10mV/div - 1V/div DC - 1.0GHz DC - 1.0GHz

5mV/div - 9.98mV/div DC - 500MHz DC - 500MHz

2mV/div - 4.98mV/div DC - 350MHz DC - 350MHz

1mV/div - 1.99mV/div DC - 150MHz DC - 150MHz

2、 Bandwidth performance verification steps (taking 50 Ω input as an example)

Equipment connection: Connect a sine wave generator (such as Fluke 9500B) to oscilloscope channel 1 via a 50 Ω coaxial cable, with the generator output impedance set to 50 Ω;

Oscilloscope settings:

Reset according to Default Setup;

Set the Acquisition Mode to Sample;

Add peak to peak measurement (Measure → Amplitude → Peak to Peak → Add);

Channel 1 setting: Termination=50 Ω, Vertical Scale=corresponding test gear (such as 1mV/div);

Signal input: The generator outputs a 10MHz sine wave, adjust the amplitude to display 8div on the screen (such as outputting 8mVpp at 1mV/div level), and record the peak value (Vin pp) at this time;

Bandwidth test: Adjust the generator frequency to the maximum bandwidth corresponding to this gear (e.g. 1mV/div corresponds to 150MHz), and record the peak value (Vbw pp) at this time;

Qualification judgment: Calculate the gain as Vbw-pp/Vin pp. If the gain is ≥ 0.707 (-3dB point), the bandwidth is qualified.

Question 2: How to test the threshold accuracy of the digital channel (3-MSO option) of the 3 series MDO? What are the key operational details to pay attention to during testing?

Answer:

1、 Testing steps for threshold accuracy of digital channels

Equipment preparation: DC voltage source (such as Fluke 9500B), P6316 digital probe, BNC-to-0.1 inch pin adapter;

Probe connection: P6316 probe Group 1 is connected to a voltage source, and an adapter is used to match the interface;

Oscilloscope settings:

Reset according to Default Setup;

Activate the digital channel (D15-D0 button → Turn All On);

Set digital channel threshold (such as 0V or 4V): D15-D0 menu → Thresholds → Enter target value;

Trigger setting: Trigger → Source=Target digital channel (such as D0), Slope=Rising/Falling;

Threshold measurement (taking 0V threshold as an example):

Vs - (high to low switching voltage): Set the voltage source to -400mV, gradually increase by 20mV until the channel displays a stable low level (blue), and record the voltage as Vs - at this time;

Vs+(low to high switching voltage): Set the voltage source to+400mV, gradually -20mV until the channel displays a stable high level (green), and record the voltage as Vs+at this time;

Calculate the average threshold: VSAvg=(Vs -+Vs+)/2;

Qualification judgment: The 0V threshold must meet the requirement of * * -0.1V ≤ VSAvg ≤ 0.1V * *, and the 4V threshold must meet the requirement of 3.78V ≤ VSAvg ≤ 4.22V.

2、 Key operational details

Probe grounding: All 8 grounding channels of P6316 probe need to be connected to user grounding to avoid threshold deviation caused by poor grounding;

Voltage stepping: After adjusting the voltage each time, wait for 3 seconds to ensure that the channel state is stable before recording to avoid transient interference;

Trigger slope switching: When measuring Vs -, use the Rising slope, and when measuring Vs+, use the Falling slope to ensure that the trigger point is consistent with the level switching;