# HP 6525A 0-4000V 0-50mA High Voltage DC Power Supply (Pre-Owned)

# HP 6525A 0-4000V 0-50mA High Voltage DC Power Supply (Pre-Owned)

## Key Features At A Glance

-   DC output range of 0–1600 V at 0–5 mA for bench-level high-voltage applications
-   Series regulator feedback circuit using a temperature-compensated zener diode for reference
-   Short-circuit protection and current-limiting built into the design
-   Floating output allowing choice of negative or positive voltages up to 1 KV off ground
-   Solid-state circuitry throughout for reliability and serviceability
-   100 V step control with intermediate vernier providing 100 mV resolution
-   0–1800 V panel meter for output monitoring
-   Operates from 115 V ±10%, 60 Hz AC input

The HP 6515A is a compact, DC-regulated bench high-voltage power supply in the HVB Series, providing 0–1600 V at 0–5 mA output. It is designed to deliver high-voltage performance in a portable bench form factor, offering low cost, low ripple, and low impedance for experimenting and circuit developing at the bench.

Applications listed for this series include photomultiplier work, traveling wave tubes (TWTs), cathode ray tubes (CRTs), gas flow tubes, proportional counter tubes, and rapid high-voltage single-trip electrophoresis. The high-performance design makes this series particularly suited for these applications, where moderate currents and stable high voltages are required.

ValueTronics International maintains a 20,000 square foot secure warehouse at 1675 Cambridge Drive in Elgin, Illinois, where high-voltage instruments like the HP 6515A are received, inspected, and held in inventory. Operating since 1992, ValueTronics is a dedicated test and measurement specialist — not a drop-shipper or pass-through broker — which means the unit you order has been physically handled and assessed by our team before it ships. For legacy HP bench supplies in particular, this depth of stocking and in-house assessment is the practical difference between a confident purchasing decision and an unverified online listing.

## Brand Heritage

Hewlett-Packard's test and measurement instrument business was spun off as Agilent Technologies in 1999, and Agilent's electronic measurement division was subsequently transferred to Keysight Technologies in 2014. The HP 6515A and the broader HVB / HVR Series carry the original Hewlett-Packard branding from the era in which these supplies were produced, predating both the Agilent and Keysight transitions.

## Compare Other Models in This Series

The datasheet covers two related families of HP high-voltage power supplies. The HVB Series — comprising the 6515A and 6516A — consists of two compact, DC-regulated bench supplies offering up to 3 KV at moderate currents, designed for low cost, portability, and high-performance bench experimenting and circuit development.

The HVR Series — comprising the 6521A, 6522A, and 6525A — consists of three tightly regulated supplies (0.005%) that provide sufficient output current for many devices not capable of being powered from conventional low-current, high-voltage supplies. Listed applications for the HVR Series include power TWTs, Klystrons, continuous wave magnetrons, power gas lasers, and electron beam welding devices.

Each pre-owned model in the HVB and HVR Series is listed on its own product page with condition-matched pricing. Selecting the correct model below depends on the required voltage range, output current, and regulation tier for the intended application.

The 6515A is the lower-voltage member of the HVB Series, providing 0–1600 V at 0–5 mA. It shares the same series regulator feedback architecture, solid-state construction, and floating-output design as the 6516A, but in a more compact voltage range suited to bench applications that do not require the higher 3000 V output of its sibling.

Within the HVB Series, the 6515A provides 0–1600 V at 0–5 mA, while the 6516A extends to 0–3000 V at 0–6 mA. Both share the same 0.01% + 16 mV load and line regulation specifications and the same temperature-compensated zener diode reference architecture. The 6516A uses a 4-digit thumbwheel control to 1-Volt resolution, where the 6515A uses 100 V steps with intermediate vernier to 100 mV resolution.

The HVR Series instruments — 6521A (0–1000 V, 0–200 mA), 6522A (0–2000 V, 0–50 mA), and 6525A (0–4000 V, 0–50 mA) — operate at the tighter 0.005% regulation tier and provide constant voltage / constant current operation with automatic crossover. The full comparison table that follows shows the voltage, current, regulation, ripple, and control configuration for each model in both series.

Model

Output Voltage

Output Current

Regulation

**6525A**

0-4000 V

0-50 mA

0.005% or 20 mV

6515A

0-1600 V

0-5 mA

0.01% + 16 mV

6516A

0-3000 V

0-6 mA

0.01% + 16 mV

6521A

0-1000 V

0-200 mA

0.005% or 20 mV

Additional differences in specifications beyond the few shown above are not listed here — see each model's full specifications below.

## Product Core & Specifications

Specification

Value

DC Output Voltage

0-4000 V

DC Output Current

0-50 mA

AC Input

115 V ac ±10%, 50-500 Hz

Load Regulation (constant voltage)

0.005% or 20 mV

Load Regulation (constant current)

2% or 1 mA

Line Regulation (constant voltage)

0.005% or 20 mV

Line Regulation (constant current)

1 mA

Ripple and Noise (peak-to-peak, constant current)

500 µA

Temperature Coefficient (constant current)

0.2% + 0.05 mA

Stability (constant voltage)

0.25% + 0.12 mA

Meters

0-4 kV and 0-50 mA

Controls

Voltage control—3 decade thumbwheel switches plus thumbwheel vernier with 0.002% resolution, current control—single-turn potentiometer

Dimensions

5¼" H x 18" D x 19" W (13.3 x 45.7 x 48.3 cm)

Weight (net/shipping)

50/60 lbs (22.5/27 kg)

**Important:** Output is floating, providing the choice of negative or positive voltages up to 1 KV off ground.**Important:** HVB Series: Output is floating, giving choice of negative or positive voltages up to 1 KV off ground.**Important:** HVR Series: With floating output, you have the option of negative or positive voltages up to 2 KV off ground.**Important:** HVB Series design includes short-circuit protection and current-limiting.**Important:** HVR Series supplies are short-circuit proof and provide constant voltage/constant current operation with automatic crossover.**Important:** All circuits are solid-state.**Important:** Note: See Model 6110A on p. 566.

## About this used unit

-   Warranty included
-   Functional verification included
-   Standard Calibration Upgrade Options: No Calibration Required, NIST Traceable, Z540.1 or ISO 17025 with Data, Z540.3 Guardbanding with Data.
-   Note that unnecessary accessories may not be included (contact Test Architect to confirm).

**Please review the Manufacturer's Data Sheet to verify published specifications. Feedback on this webpage is always welcome — please reach out to your Test Architect at any time for questions or concerns. Thank you, we truly appreciate you being our customer.**

## Details

- **Price:** 0.0 USD - 153.0 USD
- **Vendor:** HP
- **Type:** Dc Supply
- **Tags:** Agilent, Agilent Keysight, DC Power Supply, Manufacturers, Power Supplies & Loads, product_manual_group_1, Product_used

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| None | 0.00 USD | In stock |
| NIST Traceable | 93.50 USD | In stock |
| NIST Traceable with Full Data | 110.50 USD | In stock |
| ISO IEC 17025 Accredited | 153.00 USD | In stock |

## Images

- HP 6525A 0-4000V 0-50mA High Voltage DC Power Supply (Pre-Owned)

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> Source: [ValueTronics](https://valuetronics.com/products/6525a-agilent-dc-power-supply-used)
> Updated: 2026-05-30