Note: this page is obsolete and here only for
legacy reference. The EFS gui and
CAT gui take care of exposure times.
This table documents the exposure times used in the EFSgui when in "Obs. Mode -
Lamps". Users who wish to take customized calibration exposure sets can
use this table as a basis for exposures.
Notes:
- The brightness of the NIRSPEC flat lamp fluctuates on long time
scales. Integration times you used a few months ago may not
apply. Please test your integration times.
- Even the shortest itime (0.25 seconds) exposure on the arc lamps
can cause persistence on SPEC. Please see the
troubleshooting page for methods of avoiding and
recovering from charge persistence.
- The terminology below is (itime(s) x coadds).
- The pre-defined exposure sequences are:
- Low-resolution: Flatfield, test(flush), Off(at flat exposure level), Ne, Ar, test(flush).
- High-resolution: Flatfield, test(flush), Off(at flat exposure level), Ne+Ar+Xe+Kr, test(flush).
| Filter |
Low Resolution |
High Resolution |
|---|
| Flatfield |
Ne,Ar |
Flatfield |
Ne,Ar,Xe,Kr |
| NIRSPEC-1 |
29 x 3 |
0.25 x 10 |
59 x 3 |
0.25 x 10 |
| NIRSPEC-2 |
29 x 3 |
0.25 x 10 |
59 x 3 |
0.25 x 10 |
| NIRSPEC-3 |
1.9 x 7 |
0.25 x 10 |
39 x 3 |
0.25 x 10 |
| NIRSPEC-4 |
1.3 x 7 |
0.25 x 10 |
17 x 5 |
0.25 x 10 |
| NIRSPEC-5 |
1.5 x 7 |
0.25 x 10 |
17 x 5 |
0.25 x 10 |
| NIRSPEC-6 |
0.25 x 10 |
0.25 x 10 |
1.5 x 7 |
0.25 x 10 |
| NIRSPEC-7 |
0.25 x 10 |
0.25 x 10 |
3.5 x 7 |
0.25 x 10 |
| BR-GAMMA(2.16) |
0.25 x 10 |
0.25 x 10 |
2 x 7 |
0.25 x 10 |
| CO(2.3) |
0.25 x 10 |
0.25 x 10 |
2 x 7 |
0.25 x 10 |
| K |
0.25 x 10 |
0.25 x 10 |
3.5 x 7 |
0.25 x 10 |
| K-PRIME |
0.25 x 10 |
0.25 x 10 |
3.5 x 7 |
0.25 x 10 |
| L-PRIME |
0.25 x 10 |
0.25 x 10 |
1 x 10 |
0.25 x 10 |
| M-PRIME |
0.25 x 10 |
0.25 x 10 |
1 x 10 |
0.25 x 10 |
| KL |
0.25 x 10 |
0.25 x 10 |
1 x 10 |
0.25 x 10 |
| HeI(1.08) |
10 x 5 |
0.25 x 10 |
120 x 1 |
0.25 x 10 |
| PA-BETA(1.28) |
10 x 5 |
0.25 x 10 |
120 x 1 |
0.25 x 10 |
| FeII(1.64) |
1 x 10 |
0.25 x 10 |
12 x 5 |
0.25 x 10 |
| H2(2.12) |
0.25 x 10 |
0.25 x 10 |
2 x 7 |
0.25 x 10 |
| M-WIDE |
0.25 x 10 |
0.25 x 10 |
1 x 10 |
0.25 x 10 |