Troubleshooting guide

• Turn on the flatfield projector on the telescope using the Bright lamps at maximum setting.
2. Set filename and exposure time. Use config.exposure.pl.
• Integration times of 10 – 30 s should suffice for JH- and HK-band spectroscopy.
• Take a test exposure (singleimage.pl). The counts should be < 25,000 ADU for wavelengths < 2.4 μm.
• With 30 second integration times, it is possible to do 8 reads, if you can accept the little bit of extra
overhead.
• For longslit observations, one can use the White Spot. Integration times will be shorter, 5 – 10 s.
3. Take at least 5 flats with the lamps on. Use more.single.images.pl 5.
4. Have the telescope operator turn down the flatfield lamp, or turn it off.
• Flats at two different illumination levels are differenced to remove the dark current.
5. Take at least 5 flats with the lamps off. Use more.single.images.pl 5.
FLAMINGOS@4-m, Ver. 2.39, 2013 April 23 Page 33 of 47