Use this calculator for on-off observations. If you are planning on-the-fly mapping, you should instead use the dedicated OTF Calculator

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ON/OFF Integration time estimator		The (average) elevation of the source, the receiver temperature, required σ (in K), and the spectral re- solution, the on-source integration time can be es- timated. Also the total time is calculated assuming toff=ton and a system observing efficiency of 0.4, i.e. ttotal=(ton + toff)/0.4.The system efficiency takes into account both system and setup+calibration over- heads. System overheads include telescope movements, software overheads, observing mode efficiency, etc. Setup + calibration overheads include source acquisition, pointing, focus, receiver tuning and calibration scans.
Heterodyne receiver:	APEX-1APEX-2APEX-3FLASH345FLASH460
Frequency:	[GHz]
Full resolution Δv [32768 channels] :	[km/s]
Manual resolution Δv:	[km/s]
Redshift z:
Sky Frequency:	[GHz]
pwv :	[mm H2O]
Source elevation:	[deg]
rms :	[K]
Results
Tau (source elev deg)	INF
Trec [K]	49.5
Tsys [K] (source elev deg)	49.5
Beam [arcsec]	0
Position Switching On time	0.000 [s]
Total Position Switching time	0.000 [s]
Beam Switching On time	0.000 [s]
Total Beam Switching time	0.000 [s]
RMS Calculator

Last update: March 13th, 2013