PDS_VERSION_ID      = PDS3
RECORD_TYPE         = STREAM
OBJECT              = TEXT
  PUBLICATION_DATE  = 2004-07-30
  NOTE              = "Description of MB energy calibration"
END_OBJECT          = TEXT
END

Energy spectra calibration

chan 0 +AD0- 0 keV no offset

all proportionality factors +- 10+ACU-

Mer-B (Opportunity)
det 1: 122.21keV +AD0- chan 115    1.06 keV/chan
det 2: 122.21keV +AD0- chan 126    0.97 keV/chan
det 3: 122.21keV +AD0- chan 115    1.06 keV/chan
det 4: 122.21keV +AD0- chan 115    1.01 keV/chan
det 5: 122.21keV +AD0- chan 133    0.92 keV/chan

Mer-A (Spirit)
det 1: 122.21keV +AD0- chan 115    1.06 keV/chan
det 2: 122.21keV +AD0- chan 112    1.09 keV/chan
det 3: 122.21keV +AD0- chan 112    1.09 keV/chan
det 4: 122.21keV +AD0- chan 110    1.11 keV/chan
det 5: 122.21keV +AD0- chan 150    0.81 keV/chan

Note:

The 122.21 keV Co-57 line is typically not visible in the
backscattering energy spectra of the 4 main detectors. Therefore
pre-launch laboratory measurements have been taken for the esp
calibration.

The reference channel no.5 is operating in transmission. So the
detector can easily detect 122.21keV photons. Values for both
reference detectors have been taken from surface operation data.

The offset (energy at channel 0) is zero within the error limit. This
is guaranteed by extremely low offset main amplifiers.

All values apply for a setting of 256 energy channels
esp+AF8-window+AF8-width+AD0-16. This setting has not been changed
during MER operations.

All proportionality factors do have an error in the order of 10+ACU-
due to electronic gain shifts, temperature effects etc. Energy spectra
were not intended to be used for detection of sample properties but
mainly for engineering reasons and coarse functional checkouts.