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

Oscilloscope settings: Adjust the vertical offset (position) of the oscilloscope input, and select the appropriate probe range based on the measured signal voltage (low range has higher resolution and less noise, and high range needs to be switched when exceeding the range).

Security check: Confirm that the input impedance of the oscilloscope is 1M Ω and the bandwidth is not lower than the probe bandwidth; When the voltage is greater than 60VDC or 30VAC RMS, it is necessary to check again whether the accessory connections are secure.

2. Connect to the tested circuit

Connection line selection: Use the probe's built-in integral input line (25.4cm) or extension line (1.5m, paired to ensure consistent line length and reduce noise and inductance effects).

Accessory connection: Select accessories (such as hook tips, clamps, etc.) based on the type of test point, first connect the accessories to the probe input line, ensure a secure connection, and then connect them to the test circuit; Do not directly connect the voltage source when the accessory is not connected to the probe.

Measurement distance: Extending the cable can increase the distance between measurement points to 3.5m, but the measurement accuracy will decrease when the frequency is greater than 10MHz. It is recommended to use an oscilloscope with a bandwidth filter of 20MHz or below.

3. Detailed explanation of probe controls and indicator lights

Function description of control/indicator light position

Press the probe release button on the control box to unlock the connection between the probe and oscilloscope. First, disconnect the circuit and then unplug the probe

Status LED control box amber: self-test in progress; Green: Normal ready; Amber/Red: self-test failure or malfunction

The MENU button control box brings up the probe setting menu on the oscilloscope, which can operate functions such as AutoZero and range selection

The voltage range (RANGE) button and LED probe head switch between low/high range, and the LED displays the current range; Overrange LED lights up when exceeding the limit

BANDWIDTH LIMITED button and LED probe head switch to full bandwidth/5MHz limit; 5MHz can filter out high-frequency noise and harmonics in switch mode power supplies, suitable for SMPS testing

Overrange indicator light: The probe head of the probe lights up red: the differential signal exceeds the linear range of the current range, and the output signal is inaccurate

AUDBLE OVERRANGE button and LED probe head switch over range buzzer function (default enabled); ON/OFF LED indicates the current status

4. Key precautions for measurement

Limitations of Over Range Detection: OVERRANGE only detects differential over range between+/- inputs and does not detect common mode voltage or ground voltage over range. It is necessary to confirm that there is no over range situation through single ended measurement (ground at the - end and ground voltage at each point at the+end).

Common mode signal suppression: Twisted pair input lines can reduce noise coupling in high EMI environments; The higher the frequency, the lower the common mode rejection ratio, and the accuracy of the signal needs to be evaluated based on the measured frequency.

Probe load effect: The probe will introduce resistance, capacitance, and inductance into the tested circuit. When the frequency is greater than 1kHz, the input impedance decreases, and the load effect of low impedance and low-frequency signals can be ignored.

Accessory System: Standard Configuration and Optional Accessories

1. Standard accessories (by model)

(1) THDP0100 standard accessories

Accessory Name, Specification, Parameter Quantity, Revised Model

Extension cable length 1.5m, banana plug, 1000V CAT III, 600V CAT IV 1 pair 196-3523-xx

Test probe (TATP) 6-32 threaded head, with finger protection, 2300V CAT I, 1000V CAT II 1 pair included in 020-3070-xx kit

TASH compatible TATP for small conductors, 2300V CAT I, 1000V CAT II 1 pair included in 020-3070-xx kit

TALH compatible TATP for bolt terminals and busbars, 2300V CAT I, 1000V CAT II 1 pair included in 020-3070-xx kit

(2) THDP0200&TMDP0200 standard accessories

Accessory Name, Specification, Parameter Quantity, Revised Model

Extension cable length 1.5m, banana plug, 2300V CAT I, 1000V CAT III 1 pair 196-3523-xx

Handheld probe (TP175-FL) threaded head, extendable insulation sheath, 1000V CAT II/III, 10A 1 pair TP175-FL

Spring needle tip adapter and tip adapter TP175-FL, including conical tip and serrated tip, 150V CAT II, 0.1A 2 sets 020-3107-xx

Extended test probe adapter compatible with TP175-FL for dense circuits, 300V CAT II, 3A 1 pair 012-1724-xx

Hook clip (AC280-FL) banana interface, 1000V CAT III, 3A 1 pair AC280-FL

Clamp (AC283-FL) compatible with repeated test points, 1000V CAT III, 1A 1 pair AC283-FL

Crocodile clip (AC285-FL) large-sized insulation clip, 1000V CAT III, 10A 1 pair AC285-FL

Crocodile clip (344-0670-xx) double insulated, suitable for large bolts/busbars, 1000V CAT III, 10A 1 pair 344-0670-xx

The probe holder (TPH1000) supports hands-free measurement with handheld probes and requires one TPH1000 rubber foot

THV Browser adjusts the distance between two probes (maximum 2.54cm), supports one handed browsing or hands-free measurement of one THV Browser