Vartech's PPS series sits at the top of its DC power supply range - not the highest current or voltage, but the most capable when the job is repeatable, automated or unattended testing rather than a one-off bench measurement. This guide covers what "programmable" actually buys you over a standard SMPS supply, and which PPS model fits which job.
What "Programmable" Actually Adds
A standard SMPS supply gives you manual voltage and current control with a dial or buttons - fine for a single setup you dial in once and leave. The PPS-S series (PPS-3005 S, PPS-3010 S, PPS-3020 S, PPS-3610 S, PPS-6005 S, PPS-6010 S, PPS-10003 S) adds five 4-digit LED displays showing V set, I set, V out, I out and Watts simultaneously, a USB interface running ModBus-RTU for PC control, 6 stored memory sets, list mode for stepped test sequences, and programmable output-off delay timing up to 9999 seconds. None of that changes what the supply can output - it changes how repeatably and how remotely you can control what it outputs.
When this actually matters
Single-Output PPS-S vs the Triple-Output PPS 3005-3
The PPS-S models are single-output, differing mainly in voltage/current tier - PPS-3005 S (0-30 V/5 A), PPS-3010 S (0-30 V/10 A), PPS-6010 S (0-60 V/10 A) and similar, each with 10 mV/1 mA display resolution and ±(0.1% + 2 digits) setting accuracy. The PPS 3005-3 is a different animal entirely: a programmable linear supply with two main variable 0-30 V/5 A channels plus a third channel selectable between 2.5 V, 3.3 V or 5 V at 3 A - purpose-built for testing digital logic boards that need a standard logic rail (3.3 V or 5 V) alongside a variable analog or motor-drive supply, all under USB control with LabVIEW support and 4 memory sets.
Matching Voltage/Current to Your Test Sequence
Before choosing a model, map out the actual range your test sequence needs to cover - not just the peak value, but the lowest and highest points in the sequence, since a supply sized too far above your working range loses resolution at the low end. General bench R&D and embedded work is well covered by the 30 V tier (PPS-3005 S or PPS-3010 S depending on current draw); motor, solenoid or higher-voltage DC load testing typically needs the 60 V tier (PPS-6005 S, PPS-6010 S); and the PPS-10003 S (100 V/3 A) suits higher-voltage, lower-current instrumentation and sensor test work.
Automating a Test Sequence
List mode lets you programme a sequence of voltage/current/dwell-time steps directly into the supply and run it without a PC in the loop - useful for a fixed QC test that runs the same way every time. The USB/ModBus-RTU interface goes further, letting a PC or PLC set points, read back V/I/W in real time, and log results automatically - the difference between a technician manually recording readings off a display and a production line that runs unattended overnight.
Quick Reference by Use Case
- R&D bench work, single logic rail: PPS-3005 S or PPS-3010 S with memory presets for repeated setups.
- Digital logic board testing (3.3 V/5 V + variable analog): PPS 3005-3 triple output with LabVIEW support.
- Motor, solenoid, higher-voltage DC testing: PPS-6005 S or PPS-6010 S.
- Automated production-line QC testing: any PPS-S model's list mode plus USB/ModBus-RTU for full PC control and data logging.
- One-off bench measurement, no repeat testing: a standard manual SMPS model is simpler and sufficient - see our full Vartech DC power supply buying guide.
CIE Instruments is an authorised distributor for the full Vartech DC power supply range, including the PPS programmable series. Contact us with your voltage, current and automation requirements for a model recommendation.