The standard Power1401 may be expanded in capability by fitting a range of modular top boxes.  These expansion boxes make internal connections to the Power1401 motherboard. They require the Power1401 expanded mechanics (can and case) and are unsuitable for end-user installation.

8 additional channels of waveform input, 2 further channels of waveform output and 6 event input BNCs

In some circumstances, such as in many Spike2 applications, the digital inputs and outputs are heavily used for signals. It is convenient to have more of these connectors available on the front panel as BNCs. The 2701-9 top-box provides six event inputs, mapped onto digital inputs 10-15, together with eight ADC inputs and a pair of DACs, mapped onto ADC 8-15 and DAC 2-3 respectively. The safe working voltage range of the digital inputs is ±10 V, and they present an impedance of 100 kΩ.

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