Aim tti single power supply usb rs232 gpib ql355p aim tti ql355p sii p the aim tti ql355p sii offers an unparalleled level of precision voltage and current are controlled using instrumentation quality 16 bit dacs enabling voltages to be set to 1mv resolution even at full output voltage p p indeed the accuracy is sufficient for the ql to be used as a calibration source for some hand held dmms the ql series uses pure linear technology and offers unrivalled performance in terms