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Low Noise | High Resolution DAC

SP927 and SP1060

The LNHR DAC is a multi-channel voltage source with outstanding noise and resolution performance. It is designed to drive high-ohmic gates in fundamental physics experiments at cryogenic temperatures. For such experiments, ultra-stable DC bias-voltages and high-resolution sweep-voltages with very low fluctuations are necessary. The output range of ±10 V, combined with the 24-bit resolution, allows adjusting the voltages with a step size of only 1.2 μV. The output voltage noise is below one μV RMS, measured in a frequency range of 0.1 Hz to 100 Hz. The LNHR DAC can be used for DC-biasing, ramping/sweeping, and low-frequency waveform generation. The device is controlled locally by the rotary/push knob (encoder) or remotely using the TCP/IP or RS-232 interfaces. The LCD on the front panel displays the actual voltages.
The LNHR DAC is the ideal instrument for low-noise setups. The output ground is isolated from the case and the computer interface to avoid ground loops. The ground is thus provided by the shield of the cable coming from the experiment.

 
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Gate Leakage Current Measurement Box

SP1046

Installed between the LNHR DAC output and the sample, this box monitors currents during a running experiment

6 channels in parallel

pA to 10 µA range

Does not increase the gate voltage noise or deteriorate stability