Some Checks

The following procedure helps to check the quality of the calibration.

! Define parameters for checks 
CLIC\SET DEF
SET BASE 12 13 23 ! 3 antennas used in this example, see above.
SET SUB L01 TO L06
FIND/SOUR 3C84 /PRO COR
SET PHASE RELATIVE
SET AMPLITUDE RELATIVE
SET RF ON FREQUENCY
SET Y AMPLITUDE PHASE
SET PLOT HISTO
SET PLOT BARS

! CHECK 1) Amplitude and Phase versus Time 
SET X TIME
PLOT

The Phase must be centered around 0.0 ^o and the amplitude must be equal to the calibrator flux (in the previous example 4.8 Jy).

! CHECK 2. Amplitude and Phase versus I_FREQ 
SET X I_F	
PLOT

On each baseline, the phase curve must be flat and centered around 0.0 (point-like source). The amplitude must be flat and equal to the product $Flux(Jy) \times Phase(Decorrelation Term)$. The phase decorrelation term is equal to $exp{(-\delta {\Phi}^2/2)}$ where $\delta \Phi$ is the phase noise measured on each baseline by the command SOLVE PHASE. According to the previous example, the amplitude must be around $\sim 4.2$, $\sim 4.4$ and $\sim 4.5$ Jy for baselines B12, B13 and B23 respectively.