800V DC Power Supply Comparison: ETOMMENS, Keithley and GW Instek

Updated October 9, 2026

800V model comparison

Why power limits matter at 800V

For either 720W multi-range model, the power ceiling at 800V is 720W ÷ 800V = 0.90A. The 2.88A headline applies within the permitted voltage/power envelope; it is not 2.88A at 800V. At 250V, 720W ÷ 250V = 2.88A. These calculations clarify the ratings; the manufacturer’s detailed operating limits still apply.

Choose for the required operating point

The eTM-8006 has a larger stated output-power rating. That may fit a higher-current high-voltage test, but it does not by itself prove better accuracy, noise or transient response. Compare those properties separately with matching load and measurement conditions.

Controls, protection and integration

Keithley’s series documentation lists programmable rise/fall behaviour; GW Instek’s PSW documentation describes multi-range operation. For every candidate, confirm the exact interfaces, command support, protection behaviour and optional configurations. Do not infer programmability or remote SENSE from a different model in the same family.

Installation and load checks

• Verify mains capacity, input configuration and environmental conditions.
• Specify output connections, insulation and the manufacturer’s discharge procedure.
• Identify capacitive, inductive or energy-returning loads and obtain documented compatibility.
• Record your required voltage/current points and acceptance measurements for the purchase decision.

Considering a 500V test instead?

Select the voltage class from the actual load requirement. A higher maximum voltage is not automatically better for lower-voltage resolution, measurement accuracy or cost. Compare the appropriate range and available current at your test point.