This manual introduces the THURLBY THORNDARYN INSTRUMENTS EX series compact high power bench DC power supplies, which are available in single, dual and triple output models with voltage up to 150V, current up to 20A, powers from 175 watts to 420 watts and RS-232 programmable models.
The EX Series offers compact, high‑power bench DC power supplies ranging from 175 W to 420 W. Models are available with single, dual or triple outputs, fan‑less convection cooling (except EX2020R and EX4210R which use fan‑assisted cooling), and mixed‑mode regulation that combines switch‑mode pre‑regulation with linear post‑regulation.
Key features include separate digital voltage and current meters on each output, logarithmic current control, optional low‑voltage auxiliary output (EX354Tv), remote sensing on EX‑R models, and an RS‑232 programmable interface on EX‑P models. The series complies with EN61010‑1 safety and EN61326 EMC standards.
| Voltage range (single output models) | 0 V to 35 V (minimum) |
|---|---|
| Voltage range (dual/triple output models) | 0 V to 150 V (minimum) |
| Current range (single output models) | 0 A to 5 A (minimum) |
| Current range (dual output models) | 0 A to 4 A (minimum) |
| Maximum output power | 175 W – 420 W depending on model |
| Meter accuracy (voltage) | ±0.3 % + 1 digit |
| Meter accuracy (current) | ±0.6 % + 1 digit |
| Ripple & Noise (CV mode) | <2 mV rms, <10 mV pk‑pk (20 MHz bandwidth) |
| Cooling method | Fan‑less convection cooling (most models); fan‑assisted cooling for EX2020R and EX4210R |
| Input voltage | 110 V–240 V +10 %, 50/60 Hz |
| Physical size (EX355 example) | 140 mm × 160 mm × 320 mm (W × H × D) |
| Weight (EX355 example) | 3.0 kg |
The EX series can provide output voltages up to 150 V.
The EX series is available in single, dual, or triple output versions.
Most EX models use silent fan‑less convection cooling, but the EX2020R and EX4210R use fan‑assisted cooling.