Keithley 228A Programmable Voltage/Current Source

Keithley 228A Programmable Voltage/Current Source
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Manual Specifications Other1

 

4 Quadrant Operation -  The Keithley 228A is capable of bipolar source or sink up to a full 100 watts without derating, permitting it to act as a voltage or current supply or as an active load.

 

Specifications:

  • 100 watt source or sink
  • < 1ms transient recovery
  • Built-in voltage and current monitors


As a Constant Voltage Source

Output

Compliance (Source or Sink)

Range Maximum Resolution Maximum Resolution
100 V ± 101.0 V 100 mV ± 1.010 A 1 mA
± .1010 A 100 µA
10 V ± 10.10 A 10 mV ± 10.10 A 10 mA
± 1.010 A 1 mA
± .1010 A 100 µA
1 V ± 1.010 A 1 mA ± 10.10 A 10 mA
± 1.010 A 1 mA
± .1010 A 100 µA

  • Output Resistance (maximum) -
    • 100 V Range:  10 m ohms.
    • 10 V Range:   100 µ ohms.
    • 1 V Range:  100 µ ohms.
  • Output Inductance -  100 µ H typical
  • Sensing - REMOTE or LOCAL


As a Constant Current Source

Output

Compliance (Source or Sink)

Range Maximum Resolution Maximum Resolution
10 A ± 10.10 A 10 mA ± 10.10 V 10 mV
± 1.010 V 1 mV
1 A ± 1.010 A 1 mA ± 101.0 V 100 mV
± 10.10 V 10 mV
± 1.010 V 1 mV
0.1 A ± 0.1010 A 100 µA ± 101.0 V 100 mV
± 10.10 V 10 mV
± 1.010 V 1 mV

  • Output Resistance (min) -
    • 10 A Range:  104 ohms
    • 1 A Range:  10 5 ohms
    • 0.1 A Range:  106 ohms
  • Output Capacitance - 0.2 µ F typical
  • Output Load -  Must be non-inductive


Current Monitor Output
 

  • Scale Factor - 1 V = 100% of range
  • External Modulation
  • Sensitivity - -10V increases magnitude of programmed output by 100% full scales; + 10 V decreases magnitude of programmed output by 100% of full scale
  • Modulation Frequency - 600 Hz bandwidth
  • General
  • Display - Dual 3½-digit LED (0.5 in) displays indicate programmed values in Standby and output values in Operate
  • Program Memory (battery backed-up) -  Stores up to 100 output settings.
  • Range of Dwell Times:  10 ms to 1000 s 
  • Output Connections -   Quick disconnect card with screw terminals for output, modulation, current monitor, and external sense.  BNC (chassis isolated) connectors for TRIGGER IN/OUT.