Keithley
244

The Model 244 is a negative-polarity High-Voltage Supply that provides accurate, stable outputs.

• Voltage: -200 to -2200 V DC
  
• Max. current: 10 mA

Further features:

• In-line calibrated dials.- Two dials set the output voltage in 200 and 20 V steps. Trim control permits interpolation between 20 V setting, with 100 mV resolution.
  
• Overload protection.- Repeated or continuous overloads will not damage the instrument. Protection circuit limits the output current to less than 13 mA with automatic recovery when overload is removed .
  
• Stability.- Solid-state design, stable range resistors and selected zener diode provide voltage
  stability of ± 0.005% for 8-hour periods after one-hour warm-up.

Application:

• The model 244 has been designed primarily for negative-polarity high voltage biasing for photomultiplier applications.
  
• The stability, regulation and low noise also make it suitable for use with photocells, ion chambers and resistivity measurements.

Please find a corresponding data sheet here.
Please find an enlarged image here.