TESTEC TT-HVP 2739 High Voltage Passive Oscilloscope Probe | 39 kV Peak, 1000:1, CAT 0 Only

The TESTEC TT-HVP 2739 is a 1000:1 passive high voltage oscilloscope probe rated to 39 kV DC+AC peak and 27 kV AC RMS, with DC to 50 MHz bandwidth, 7 ns rise time and 900 MΩ / 2.0 pF input loading. TESTEC designs it for use within Measurement Category 0 (CAT 0) only and for ground-referenced measurements only, on high-voltage supplies and generators in the lab. It plugs into a standard oscilloscope BNC input with no external power.

39 kV Peak Through a 1000:1 Passive Divider

At 1000:1, 39 kV at the tip reads as 39 V on the oscilloscope. DC accuracy is within 3% from 0 to 35 kV, and AC accuracy is within 6% at 1 kHz. Input resistance is 900 MΩ and the maximum loading current is 45 µA, which limits loading on the source.

Above 25 kV, TESTEC states that the TT-IH 2739 high-voltage isolation head must be connected to the probe to meet IEC 61010-031:2015. TESTEC also states that the probe is not suitable for long-time use: at 30 kV DC or 20 kV AC RMS and above, keep contact with the circuit to 30 seconds, with at least 5 minutes between measurements.

DC to 50 MHz Bandwidth for High Voltage Edges

With 2.0 pF input capacitance and a 7 ns rise time, this high voltage oscilloscope probe resolves switching edges and pulse shapes as well as DC levels and ripple. For signals above 40 MHz, or when adjusting the bandwidth, TESTEC specifies the short earth lead connected to the alligator clip to get the best frequency response. The compensation trimmer sits in the BNC plug and covers oscilloscope inputs from 15 pF to 35 pF (TESTEC's manual gives 10 pF to 35 pF); it is set with the supplied adjust bar against a 200 Hz square wave whenever the probe moves to another oscilloscope or channel.

Safety Rating and Conditions of Use

TESTEC lists IEC 61010-031:2015 as the safety standard and states that the probe is designed for use within Measurement Category 0 (CAT 0) only. It must not be used on circuits defined by any other measurement category. The probe is for indoor use, and only by trained or otherwise qualified personnel.

All measurements are ground referenced. The alligator clip goes to a good earth ground before the tip touches the high voltage, and the tip is removed before the ground clip. TESTEC prohibits floating measurements with this probe. If it has been exposed to more than 39 kV DC or 27 kV AC RMS, it must not be used again.

Specifications

Limitations

• CAT 0 only. It must not be used on circuits defined by any other measurement category. For other work, check the rating of an active differential probe such as the TT-SX 9002 against your circuit.
• Ground-referenced measurements only. TESTEC prohibits floating measurements.
• Measurements above 25 kV need the TT-IH 2739 isolation head connected.

What's Included

TESTEC does not publish a box-contents list for the TT-HVP 2739. The manual refers to a supplied adjust bar for the compensation trimmer, and to the short earth lead and alligator clip used in measurement. The TT-IH 2739 isolation head is not stated as included; ask us when ordering.

TT-HVP 2739 Compared with Other TESTEC High Voltage Probes

Typical Applications

Checking the output level and ripple of a high-voltage DC supply up to 35 kV, the range over which TESTEC specifies DC accuracy within 3%. Capturing switching edges and pulse shape on a high-voltage generator output, using the 50 MHz bandwidth and the short earth lead. Measuring AC high voltage up to 27 kV RMS, with AC accuracy within 6% at 1 kHz. Above 30 kV DC or 20 kV AC RMS, each measurement is limited to 30 seconds of contact.

The TT-HVP 2739 suits test and development engineers making ground-referenced CAT 0 measurements on high-voltage sources, who need a 39 kV peak rating and a 50 MHz bandwidth in one passive probe. TESTEC's manual gives no voltage derating curve against frequency, so do not assume the full 39 kV applies at 50 MHz.

Order the TESTEC TT-HVP 2739 €1.286,95 ex VAT. If your measurement is above 25 kV, ask us for a formal quotation that includes the TT-IH 2739 isolation head.

Frequently Asked Questions

What Measurement Category Is the TT-HVP 2739 Rated For?

CAT 0 only. TESTEC's manual states it is designed for use within Measurement Category 0 and must not be used on circuits defined by any other measurement category. The safety standard listed is IEC 61010-031:2015.

Answered by John Legg, Director, Debug Store

Can I Make Floating Measurements with It?

No. TESTEC prohibits floating measurements with the TT-HVP 2739. Connect the ground clip to a good earth before the tip touches the high voltage. For floating measurements, use an active differential probe within its own rating.

Answered by John Legg, Director, Debug Store

Do I Need the TT-IH 2739 Isolation Head?

Yes, for any measurement above 25 kV. Above 25 kV, TESTEC states that the TT-IH 2739 high-voltage isolation head must be connected to the probe to meet IEC 61010-031:2015.

Answered by John Legg, Director, Debug Store

Which Oscilloscopes Can It Be Compensated To?

Any oscilloscope with a BNC input whose input capacitance falls within the compensation range: 15 pF to 35 pF on testec.de, 10 pF to 35 pF in the 2024 manual. The trimmer in the BNC plug is set with the supplied adjust bar against a 200 Hz square wave. Check compensation against a 200 Hz square wave on any input below 15 pF.

Answered by John Legg, Director, Debug Store

Last reviewed: 30 October 2026