| Module | Description | Number of channels |
|---|
| OP8121 | Current source, up to 5A RMS / 1V RMS | 2 |
| OP8122 | Current source, up to 2A RMS / 1V RMS | 4 |
| OP8123 | Current source, up to 1A RMS / 16V RMS | 4 |
| OP8124 | High voltage output, up to 150V RMS / 1mA RMS | 4 |
| OP8125 | Voltage amplifier, 150V RMS / 30mA RMS | 4 |
