205B Series

  • 1-50kV @ 15-30W
  • Low Ripple and Noise
  • Reversible Output Polarity

Precision High Voltage Power Supplies

Spellman’s Bertan brand of 205B Series high voltage power supplies provide regulated high voltage outputs from 1 to 50kV. The low noise, linear topology employed results in extremely low output ripple specifications. These 15 to 30W units are inherently reversible by design, providing either positive or negative output polarity. The 205B is fully arc and short circuit protected. Excellent regulation specifications are featured along with outstanding stability performance. 

Typical applications:

  • HiPot Testing
  • CRT Testing
  • Electrostatics
  • E Beam Systems
  • General Laboratory Usage

CE Marking


(Ref. 128046-001 REV. K)

Input Voltage:

115Vac, ±10%, 50/60Hz @ 1A 
230Vac, ±10%, 50/60Hz @ 0.5A 
Input voltage is switch selectable

Output Voltage:

See “model selection” table

Output Polarity:

All units are reversible polarity by design

Output Current:

See “model selection” table

Voltage Regulation:

Line: ≤ 50ppm/0.001% of rated output voltage 
over specified input voltage range 
Load: ≤ 0.005% of rated output voltage for a full 
load change

Current Regulation:

Internally set to limit at 105% of rated current at full output voltage. Maximum output current at any other voltage setting must be derated linearly down to 30% of maximum at zero output voltage.


See “model selection” table

Temperature Coefficient:

≤ 50ppm/°C 


≤ 0.01%/hour, 0.02% per 8 hours after 
a 1/2 hour warm up


Current Monitor: ±(0.5% of reading + 0.25% of maximum)

Remote Programming: ±(0.1% of setting + 0.1% of maximum)

Voltage Monitor: ±(0.1% of reading + 0.1% of maximum)

Front Panel Meter: Voltage  ±(0.1% of setting + 0.1% of maximum)

Current:  ±(0.25% of setting + 0.25% of maximum)

Front Panel Control: ±(0.25% of setting + 0.05% of maximum) 

Operating Temperature: 

0°C to +50°C

Storage Temperature:

-40°C to +85°C


20% to 85%RH, non-condensing

Input Line Connector:

IEC320 EMI filter/ input connecter, a detachable line cord is provided

Interface Connector:

9 pin “D” connector, a mating connector is provided

Output Connector:

A detachable 10 foot (3 meter) long HV cable is provided


Convection cooled


1-20kV:19.0. W X 3.5. H X 9.625. D (483mm X 89mm X 244mm)

30-50kV:19.0. W X 5.25. H X 16.0. D (483mm X 133mm X 406mm)


≤ 20lbs (9.1kg) up to and including 20kV units,

≤ 35lbs (15.9kg) for 30kV and 50kV units

Regulatory Approvals:

Compliant to 2004/108/EC, the EMC Directive and 2006/95/EC, the Low Voltage Directive.


RF - Isolated (Floating) Output

Model Selection Table

205B Series Voltage Current Ripple
205B-01R 0 to 1kV 0 to 30mA 10mV
205B-03R 0 to 3kV 0 to 10mA 30mV
205B-05R 0 to 5kV 0 to 5mA 50mV
205B-10R 0 to 10kV 0 to 2.5mA 100mV
205B-20R 0 to 20kV 0 to 1mA 300mV
205B-30R 0 to 30kV 0 to 0.5mA 400mV
205B-50R 0 to 50kV 0 to 0.3mA 2V

Interface Connector

Pin Signal Parameters
1 Voltage Monitor 0 to 5Vdc = 0 to 100% rated voltage, Zout = 10KΩ
2 N/C No Connection
3 Enable TTL "0" disables HV, TTL "1" or open enables H
4 +5Vdc Reference +5.0Vdc @ 10mA, maximum
5 Current Monitor 0 to 5Vdc = 0 to 100% rated current, Zout = 10KΩ
6 Voltage Program Input 0 to 5Vdc = 0 to 100% rated voltage, Zin = 1MΩ
7 Analog Ground Ground
8 Digital Ground Ground (for use only with 200-C488, sold separately)
9 Polarity Indicator Open collector, 30V @ 25mA, positive = ON


Isolated (Floating) Output-Option RF

Units can be provided with the output capable of floating up to ±2kV from ground. All controls, programming and monitoring functions are normally referenced to ground. The high voltage output polarity with respect to the floating input terminal is reversible. Floating input connec­tor is Spellman P/N JDK. Mating connector is provided with each unit (Spellman P/N PDB, MHV type UG-932/U). Replace “R” suffix with “RF” for this option.

Tables & Diagrams

205B High Voltage Power Supply (Image 1)

205B High Voltage Power Supply (Image 2)

205B High Voltage Power Supply (Image 3)

Note: All specifications are subject to change without notice. Please consult the PDF version of this datasheet for the most up-to-date revision.