TEKTRONIX THDP0100/0200 and TMDP0200 series high-voltage differential probes

Operation steps:

Turn off generator output → Set probe range and generator parameters → Turn on generator → Record DMM reading → Turn off generator → Switch range and repeat measurement.

(3) Rise time verification

Device connection:

Pulse generator output → 2X attenuator → 50 Ω terminal → BNC - dual banana adapter → probe input (+/-);

Connect the probe to the oscilloscope and keep the input line straight and parallel.

Parameter settings:

Pulse generator: 50V output, 1kHz frequency, 200ns pulse width (probe input actual 25V, due to 2X attenuation);

Oscilloscope: 5V/div, 10ns/div, full bandwidth, average of 16 samples;

Probe: Full bandwidth, corresponding range.

Measurement and Qualification Standards:

Turn on the generator and use an oscilloscope to automatically measure the rise time → record the value → switch the range and repeat the measurement;

Qualification criteria: THDP0100 range ≤ 3.6ns; THDP0200 150V range ≤ 2.4ns, 1500V range ≤ 2.0ns; TMDP0200 75V range ≤ 2.4ns, 750V range ≤ 2.0ns.

4. Internal adjustment (limited to probes with serial number C020000 and above)

(1) Adjustment premise

The safety label on the back of the probe needs to be removed (must be replaced after repair) and an insulation adjustment tool should be used.

Preheat for 20 minutes before adjustment, strictly follow the high-voltage operation specifications (professional personnel are required for voltage>30VAC RMS).

(2) Adjustable projects and processes

Adjust the reference standards for the core steps of the project

Gain accuracy 1. Connect the calibration fixture, generator, and DMM; 2. Verify parameter settings based on gain accuracy; 3. Use insulation tools to adjust the DC gain potentiometer of the corresponding range, so that the DMM reading is within the qualified range and meets the gain accuracy verification standard (± 2%)

DC CMRR 1. Connect the two inputs of the probe to the generator+terminal, and set the generator parameters according to the table; 2. Set the oscilloscope to 10ms/div and 5MHz bandwidth; 3. Adjust the DC CMRR potentiometer to minimize the signal amplitude displayed on the oscilloscope. The signal amplitude should be minimized without significant fluctuations

LF compensation 1. Probe input connected to generator for fast rising edge output (10kHz, 50Vp-p); 2. Set the oscilloscope to 4 μ s/div, averaging 16 times; 3. Adjust in the order of "long+LF → long+LF * → short+LF" (TMDP0200 without+LF *); 4. Reverse the input line and adjust the square wave response optimization by pressing "Long LF → Long LF * → Short LF", without overshoot or attenuation

AC CMRR 1. Connect the two inputs of the probe to the generator+terminal, and set the generator to 297Vp-p (105Vrms) and 100kHz; 2. Set the oscilloscope to 10 μ s/div and probe to full bandwidth; 3. Fine tune+LF potentiometer (short+LF → long+LF → long+LF *) to minimize signal amplitude. The signal amplitude is minimized, and CMRR conforms to typical values

(3) DC CMRR generator parameter settings

Probe Model Range Generator Voltage (rms) Generator Voltage (p-p) Frequency

THDP0100 600V 353.53V 1000V 40Hz

THDP0200 150V 200V 566V 40Hz

TMDP0200 75V 353.53V 1000V 40Hz

Troubleshooting and Maintenance

1. Common faults and solutions

Troubleshooting steps for possible causes of fault phenomena

The probe LED does not light up frequently. There are interface and channel faults between the probe and oscilloscope. 1. Disconnect and reconnect the probe; 2. Replace the oscilloscope channel; 3. Restart the oscilloscope and reconnect it; 4. Replace the oscilloscope for testing (if the fault follows the probe, it needs to be returned to the factory)

The oscilloscope has no signal and the display accessories are not fully connected, the probe and circuit are loose, and the probe is faulty. 1. Check whether the accessory connections are firm (banana plugs and clamps need to be fully inserted); 2. Reconnect the probe to the tested circuit and confirm good contact; 3. Perform functional checks to verify if the probe is functioning properly; 4. Check the oscilloscope channel settings (such as coupling mode and range)

The OVERRANGE light is abnormally on, and the differential signal is out of range and the common mode voltage/ground voltage is out of range. 1. Switch to a higher range and observe if the light goes out; If it is already at the highest range, stop measuring and check the measured signal; 3. Perform single ended measurement to confirm that the common mode voltage and ground voltage do not exceed the rated value of the probe

Measurement signal distortion: Insufficient probe bandwidth, input line not twisted, load impact: 1. Confirm that probe bandwidth is ≥ measured signal frequency; 2. Twist the input line to reduce noise coupling; 3. Evaluate the impact of probe load on the tested circuit and replace the high input impedance probe if necessary

The gain accuracy probe is not calibrated and the environmental temperature and humidity exceed the standard. 1. Perform AutoZero calibration; 2. Re calibrate the gain according to the performance verification process; 3. Confirm that the measurement environment is within the range of 0 ℃~40 ℃ and 5%~85% RH