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EHT Power Supply
EHT Power Supply (Product Code: SLE/PHY/162) is an extra-high-tension laboratory power supply used to drive electron tubes and electrostatic experiments in college and advanced school physics labs. It gives a fully isolated, continuously variable output of 0–2.5 kV or 0–5 kV DC at a maximum of 2 mA, shown on a bright 12.5 mm green LED display, plus a 6.3 V AC auxiliary output for cathode heaters. It is supplied by Jain Scientific Equipments Pvt Ltd (ScienceLab), Ambala, India.
Specifications
| Parameter | Detail |
|---|---|
| EHT output | Continuously variable, 0–2.5 kV DC or 0–5 kV DC, maximum 2 mA; fully isolated |
| Current limiting | Electronically limited to 2 mA; outputs also current-limited by 100 kΩ resistors to avoid larger transient currents |
| Output stability | Specially wound switching transformer keeps the output voltage stable with time |
| Secondary outputs | Two, via 25 MΩ safety resistors (total 50 MΩ on the 5 kV range); short-circuit current 60 µA for electrostatic experiments |
| Auxiliary output | 6.3 V AC at 1 A for cathode heaters, protected by resettable fuse |
| Display | Bright 12.5 mm green LED display indicating EHT output |
| Earthing | Independent earth terminal for earthing any one of the five output sockets |
| Sockets | Shrouded; suitable for standard 4 mm plugs or shrouded plugs |
| Input | 220–240 V, 50/60 Hz |
| Mains supply (as listed) | 230 V ±5%, 50 Hz |
| Fuse | 315 mA (L) |
| Dimensions | 208 x 155 x 115 mm (W x H x D); height including handle 187 mm |
| Suitable for | Driving Teltron tubes and electrostatic experiments |
| Product code | SLE/PHY/162 |
| Supplied by | Jain Scientific Equipments Pvt Ltd (ScienceLab), Ambala, India |
What Is the EHT Power Supply Used For?
Electron-beam tubes need a high accelerating voltage on the anode and a low-voltage supply for the cathode heater. This unit provides both: the variable EHT output accelerates the beam, and the 6.3 V AC auxiliary output heats the cathode, so one supply can run deflection and fine-beam experiments such as measuring the specific charge of the electron. The bright LED display lets the class read the accelerating voltage as it is adjusted.
For electrostatics, the secondary outputs pass through 25 MΩ resistors, which limit the short-circuit current to 60 µA while still delivering a high voltage for charging plates and electroscopes. High voltage demands care: only trained staff should set up the unit, use shrouded leads where possible, turn the output to zero before making connections, and use the independent earth terminal as the experiment requires.
What to Specify When Ordering
- The tubes or electrostatic experiments you plan to run, so matching tubes and holders can be quoted together.
- Whether shrouded leads are needed for the output sockets.
- Your local mains supply, checked against the listed 220–240 V input.
- Any documentation required, such as a calibration certificate — ask us before ordering.
Supplier
Jain Scientific Equipments Private Limited, trading as ScienceLab, supplies the EHT Power Supply from Ambala, Haryana, India. The company also supplies the electron tubes, tube holders and electrostatics apparatus this unit is typically used with, so a physics department can source the supply and the experiments it powers through a single quotation. Colleges, universities, schools, dealers and institutional buyers across India and international markets are served. More about the company is on our company profile.
Related Physics Lab Equipment
These items are commonly powered by, or used alongside, an EHT supply:
- Teltron Electron Deflection Tube D — for studying electric and magnetic deflection of an electron beam.
- Teltron Dual Beam Tube D — helium-filled tube for observing fine luminous electron beams.
- Teltron Tube Holder D — holder for mounting D-series tubes.
- High Tension Power Supply — companion supply designed for thermionic experiments.
- Electroscope, Gold Leaf — for electrostatic experiments using the current-limited outputs.
Browse more power supplies and electrical apparatus in the Physics Lab Equipment category.
Frequently Asked Questions
What output does the EHT Power Supply provide?
The EHT Power Supply provides a fully isolated, continuously variable output of 0–2.5 kV or 0–5 kV DC at a maximum current of 2 mA. The output is shown on a bright 12.5 mm green LED display for easy reading during experiments.
Can the EHT Power Supply drive Teltron tubes?
Yes. The EHT Power Supply is described as suitable for driving Teltron tubes. Alongside the high-voltage output it has an auxiliary 6.3 V AC output at 1 A for cathode heaters, protected by a resettable fuse.
What are the secondary outputs on the EHT Power Supply for?
The two secondary outputs on the EHT Power Supply are linked through 25 MΩ safety resistors, totalling 50 MΩ on the 5 kV range. They limit the short-circuit current to 60 µA, making them appropriate for electrostatic experiments.
How does the EHT Power Supply limit current?
The EHT Power Supply limits output current electronically to 2 mA, and its outputs are also current-limited by 100 kΩ resistors to avoid larger transient currents. The auxiliary heater output is separately protected by a resettable fuse.
What mains supply does the EHT Power Supply need?
The EHT Power Supply is listed with an input of 220–240 V, 50/60 Hz, a mains supply rating of 230 V ±5%, 50 Hz, and a 315 mA (L) fuse. Check these figures against your local mains supply before ordering.
What are the dimensions of the EHT Power Supply?
The EHT Power Supply measures 208 x 155 x 115 mm (width x height x depth), and its height including the handle is 187 mm. It has five shrouded output sockets suitable for standard 4 mm plugs or shrouded plugs.
Is a calibration certificate available for the EHT Power Supply?
Calibration-certificate availability for the EHT Power Supply should be discussed with us before ordering. State the requirement in your enquiry through our contact page and we will confirm what documentation can accompany the unit.
Who supplies the EHT Power Supply?
The EHT Power Supply is supplied by Jain Scientific Equipments Pvt Ltd (ScienceLab), Ambala, Haryana, India, to colleges, schools, dealers and institutions across India and international markets. Send the product code SLE/PHY/162 and quantity for a quotation.
Request a Quote
To request a quotation for the EHT Power Supply (SLE/PHY/162), write to us through the contact page or add it to the enquiry cart with the tubes and leads you plan to use.
Last updated: 24 September 2026
