This module is designed to provide up to 90V (180Vpp) to a high impedance (>100Mohm) load, usually a (back)gate.
To prevent interference it uses a static optical method to generate these voltages, so no switching signals or transformers are used. The [Hv-out] output (pin 4) is referred to ground (pin2=ground).
The [Error] led lights when the output voltage is not correct, usually because of too much loading (>0.2uA).
The current monitor output [Monitor 1V/uA] can be used to check for gate leakage.
The Range switch helps to scale the controlling voltage (DAC) for maximum resolution.
The output swing switch enables clamping the output to only positive or negative voltages if this is needed to protect the sample.
Although the output voltage can be high, use of the module is safe because the currents that it can deliver are < 1/10000 of the danger level (as long as it is not used to charge large capacitors)
Maximum output current (shorted) is approx 1uA, bandwidth is 30Hz..1kHz, depending on the load capacitance and voltage swing.
output (measured with 100xprobe) producing 10Hz 180Vpp square in 10pF load:
output (measured with 100xprobe) producing 10Hz 180Vpp square in 3nF load:
output (measured with 100xprobe) producing 10Hz 180Vpp triangle wave:
Manufacturing options are:
Double circuitry inside to make up to +/180V, or double output current
A higher sensitivity current readout could also be implemented