SpellmanHV MX8Plus High Performance High Voltage Power Supply


  • ±8kV 25mS Polarity Reversing Speed
  • Precision Analog V/I Control and Monitors
  • High Stability, Low Ripple and Noise
  • RoHS Compliant

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

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High Performance High Voltage Power Supply

Spellman's RoHS compliant MX8 Plus is a well-regulated high performance fast reversible supply featuring a 25ms "hot switchable" polarity reversing capability. The MX8 Plus's low ripple specification is typical of the topologies that make Spellman High Voltage your ideal choice for mass spectrometry applications; especially security detection systems, dynodes, sample ionisation as well as capillary electrophoresis and electrostatic printing applications. The MX8 has been designed especially for EI and APCI applications. The MX8 Plus can be easily tailored to an OEM's requirement, such as improved ripple performance, or different voltage and/or current capabilities. 

Typical applications:

  • Mass Spectrometry
  • Capillary Electrophoresis
  • Electrostatic Printing


(Ref. 128067-001 REV. H)

Input Voltage:

+24Vdc, ±10%

Input Current:

<0.5A nominal continuous

<1.2A peak during reversing 

Output Voltage:

0V to ±8kV (see note 1)

Output Current:


Output Polarity:


Voltage Regulation:

Line: <±0.1%% for ±10% input voltage change

Load: <0.1% for 0 to full load 

Current Regulation:

Line: ±0.1% for +1V input voltage change for any load condition

Load: ±0.1% for full load to short circuit


<0.1% p-p @ 100μA 

Temperature Coefficient:

≤ 100ppm per degree C


Temperature Range:

Operating: 5°C to 45°C

Storage: -35°C to 85°C


10% to 85%, non-condensing


0.05% per hour after 1 hour warm up

Polarity Reversal Time:

<25ms from command to 90% into 100pF load capacitance(see note 2) 


Arc and short circuit protected

Output Voltage Limit:

Output voltage must not exceed ±8kV ±250V under any input or output conditions


1.48. H X 3.23. W X 9.45. D (37.6mm X 82mm X 240mm)


Approximately 3.3 pounds (1.5kg)

Input Connector:

14 way Molex housing p/n 39-01-2140 or similar with female terminals. Cable length 508mm

Output Connector:

Alden F303RX12, mating connector not provided

Regulatory Approvals:

Compliant to EEC EMC Directive. Compliant to EEC Low Voltage Directive. UL/CUL recognized file E227588. RoHS compliant.


Note 1: Linearity not guaranteed below 200V. Maximum offset ±20V when programmed to zero or disabled using remote enable.

Note 2: Unit incorporates circuitry to minimize the effects of low programmed current on reversing time. Polarity reversal time applies when current is programmed to 3µA or above.


Pin Signal
1 +24Vdc Input
2 Chassis and 24Vdc Ground
3 Enable/Inhibit Input
4 8kV Voltage Monitor output
5 Voltage Control Input
6 Current Monitor Output
7 Current Control Input
8 Polarity Control Input
9 Analog Ground
10 Current/Voltage Control Indicator
11 N/C
12 N/C
13 N/C
14 N/C
How to Order:
Standard: PART NO.:MXP8PN24

Tables & Diagrams



SpellmanHV MX8PLUS High Voltage Power Supply (Image 2)


SpellmanHV MX8PLUS High Voltage Power Supply (Image 3)


SpellmanHV MX8PLUS High Voltage Power Supply (Image 4)