| Characteristic | Det/Grat | Requirement | Present | Goal |
|---|---|---|---|---|
| (1 sigma) | (Dec 2003) | |||
| Absolute Positions | HRC/ACIS | 1.0" | 0.6" (90%) | 0.6" (90%) |
| Relative Spatial Positions | ACIS-I | 0.1" | 0.1" | 0.1" |
| ACIS-S3 | 0.1" | 0.1" | ||
| HRC-I | 0.3" | 0.1" | ||
| Absolute Energy Scale | ACIS | 1 eV | 3.0 eV at 1.5 keV | 3.0 eV |
| LETG/HRC-S | 0.02A | 0.013A | 0.010A | |
| MEG/ACIS-S | 0.03A (MEG) | 0.011A | 0.010A | |
| HEG/ACIS-S | 0.03A (MEG) | 0.006A | 0.005A | |
| Absolute Imaging Efficiency (Effective Area) | ACIS | 2% | 12% | 5% |
| HRC | 7% | 10% | 7% | |
| Absolute Gratings Efficiency (Effective Area) 1st order | LETG/HRC-S | 10% | 15% | 10% |
| HETG/ACIS-S | 10% | 15% | 10% | |
| Absolute Gratings Efficiency (Effective Area) 2nd - 5th Orders | LETG/HRC-S | 20% | 15% | |
| HETG/ACIS-S | 20% | 15% | ||
| Energy Resolution (FWHM) | ACIS | 3% | 12% | 8% |
| LETG/HRC-S | 3% | 20% | 10% | |
| MEG/ACIS-S | 3% | 4% | 3% | |
| HEG/ACIS-S | 3% | 5% | 3% | |
| Relative Efficiency (Effective Area) | ACIS | 1% on scales of 1' | 2.0% | 1.0% |
| ACIS | 10% | 3% on scales of 200 eV | ||
| HRC | 1% on scales of 1' | 0.7% | 0.7% | |
| LETG/HRC-S | 3% on scales of 0.05A | 6% | 3% | |
| HETG/ACIS-S | 3% on scales of 0.05A | 10% | 3% | |
| Point Spread Function | HRC/ACIS | 0.1% of peak within 1" annuli out to 16" | 0.004% | 0.004% |
| 0.001% of peak between 16" and 20" | 0.00008% | 0.00008% | ||
| Relative Time Precision | HRC | 16 mu s | 4-18 mu s | 16 mu s |
| Absolute Time Accuracy | HRC | 100 mu s | 35 mu s | 35 mu s | ACIS-CC | 1.5 m sec | 1.5 m s |