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Keithley 228A |
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Programmable Voltage/Current Source
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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.
- 100 watt source or sink
- < 1ms transient recovery
- Built-in voltage and current monitors
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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
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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
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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.
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