Low-power, noise dc converters are programmable

XP EMCO P series of micro-power dc to HV dc converters provide a programmable 0V to 1,200V or 0Vdc to 2,000Vdc output in a miniature, lightweight, PC-mount package. Positive and negative outputs are available. The output-voltage is linear to the programming voltage, from turn on to maximum output-voltage, enabling easy low-voltage control of the high voltage. A precision on-board voltage reference allows for simple configuration for full scale, fixed, or variable output. Voltage monitoring is provided at a 1000:1 ratio. Ripple voltage less than 100 microvolts and extremely low EMI / RFI make device suitable for integration into noise sensitive equipment. Product provides an inductor / transformer-less design, grounded case and draws less than 4 mA at full output.  http://www.emcohighvoltage.com