Description
Power stages push voltages that a standard scope probe cannot take. The Tektronix P5122 high-voltage passive probe is a single-ended passive probe built for that work, with a 1000 V RMS CAT II rating and 200 MHz bandwidth. Because it needs no power or amplifier, setup stays simple. Lost in HCM rents and sells it, and it can arrange service on request.
What the rating and input mean
The listing gives an input impedance of 100 MΩ in parallel with 4 pF. So the probe draws very little from the circuit, even on high-impedance nodes. Meanwhile, the 1000 V RMS CAT II figure sets the upper limit for its use. Treat those values as the ceiling, and follow the manufacturer’s manual and ratings.
Where the Tektronix P5122 high-voltage passive probe fits
- Switch-mode power supply design and repair.
- Motor drive and inverter work in factory maintenance.
- Lighting ballast and appliance control boards.
- Training benches in power electronics courses.
In these settings, 200 MHz covers the switching edges that most engineers want to see. However, very fast gallium nitride edges may call for a different probe type, so check your edge speed first.
Connecting it to your scope
The probe plugs into a 1 MΩ oscilloscope input. According to the listing, some scopes may need manual setup, for example to set the probe ratio. Therefore check the scope menu before the first reading. Also confirm the connector and accessory kit with Lost in HCM when you ask for a quote.
Looking after it
Keep the tips, clips and marker rings together in one pouch, so the kit stays complete between jobs. Also store the Tektronix P5122 high-voltage passive probe coiled loosely, because tight bends stress the cable.
Buy or rent
Rent it for a power audit, a repair campaign or a trial run. Alternatively, buy one when high-voltage work is part of normal duty. Send your scope model, voltage range and accessory needs, then request a quote from Lost in HCM. You can also see other oscilloscope probes, visit Tektronix for the manual, or contact SMK Vietnam.
P5122 FAQ
What voltage rating does the P5122 carry?
The listing states 1000 V RMS CAT II.
Does it need a 50 Ω input?
No. It connects to a 1 MΩ oscilloscope input, as the listing notes.
Why might my scope show the wrong scale?
Some scopes need manual setup with this probe. So set the probe ratio by hand if the scope does not do it.
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