Integration and Functional test measurements

1. Integration and Functional test measurements D. Teyssier, ESAC On behalf of the AIV/ILT team

2. Short Functional Test (SFT) Objectives • Initializes the instrument for each band and frequency of interest Plans and test set-up • Use of the complete instrument, with no additional test equipment • Set all sub-systems to safe values for each band in a sub-set of frequencies • Tune backend attenuators (quick check of signal chain) Analysis tools • Diagnostics mostly based on Housekeeping. Dedicated scripts is available to check high number of HK parameters in an automatic way • Spectrometer output check done on-line with the QLA application • Team: W. Luinge, all test engineers, test operators, others Integration and functional test measurements

3. Integration Tests Objectives • Checks correct behavior of various components of the FPU/LOU/LSU • Build up look-up tables for frequency-dependent parameter settings (e.g. diplexer, magnet current) or chopper positions Plans and test set-up • Use of the complete instrument, with no additional test equipment Check of IF chain • Check total power IF level when switching on successively 1st and 2nd IF level amplifiers Chopper characterization • Check correct commanding of chopper actuators (only HK) • (with tuned LO and mixer) measure chopper positions of interest for each mixer band and polarization (HBB, CBB, M3 centre, M3 left, M3 right, end-stop left, end-stop right) Integration and functional test measurements

4. Integration Tests Plans and test set-up Diplexer characterization • Check correct commanding of diplexer actuators (only HK) • (with tuned LO and mixer) measure optimum (i.e. lowest noise) diplexer position for a given frequency. Fill in configuration look-up table. Magnet characterization • Check correct commanding of magnet currents (only HK) • (with tuned LO) measure optimum (i.e. lowest IF level) magnet currents prior to automatic magnet tuning LO tuning • Check correct output level of LO drain voltage based on requested mixer current level Magnet tuning • Check correct output magnet current after automatic optimization (based on minimum IF level) Integration and functional test measurements

5. Integration Tests Plans and test set-up Mixer characterization • Measure IV curve at various steps of the tuning sequence Backend attenuator tuning • Once system tuned at frequency of interest, check automatic optimization of spectrometer attenuators and take representative spectrum Instrument sensitivity check after tuning • Once system tuned at frequency of interest, measure receiver sensitivity (noise temperature) using the two internal loads Response times • Measure response time for: • LO sub-band change • Mixer band change • HBB heating • Chopper rotation and frequency switch operations Integration and functional test measurements

6. Integration Tests Analysis tools • Spectrometer output check done on-line with the QLA application • All analysis scripts (either based on HK or spectra analysis) exist since the DM phase and have been used and improved over the campaigns • Exception: response time. Procedure never tested before. No analysis tool written yet. • Outputs: • frequency-dependent diplexer settings • frequency-dependent magnet settings (before tuning) • frequency-dependent targeted mixer current (for tuning) • frequency-dependent LOU settings • Team: W. Luinge, all test engineers, test operators, others Integration and functional test measurements

7. Functional tests Objectives • General check of the good functioning at all level after switching on and instrument optimization steps for a given mixer and frequency • Test expected to be repeated during various phases of the campaigns and will serve as reference for further measurements in ILT, IST or PV Plans and test set-up • Use of the complete instrument, with no additional test equipment Instrument initialization and tuning (LO, magnets, spectrometers) • Same as integration tests Functional test un-pumped (LO power shut off) • Check correct instrument behavior in un-pumped conditions • IV curve • IF noise measurement Integration and functional test measurements

8. Functional tests Plans and test set-up Functional test pumped • Check adequate performances of instrument after tuning • IV curve • Magnet scan • Noise temperature Analysis tools • Spectrometer output check done on-line with the QLA application • All analysis scripts (either based on HK or spectra analysis) exist since the DM phase and have been used and improved over the campaign • Team: W. Luinge, all test engineers, test operators, others Integration and functional test measurements