DSP 2190 MCS Averager
config file
CA_DSP2190 = slot_number
edconf:
CAMAC screen
Slot Module Unit Description
1 DSP2190 DSP 2190 MCS Averager
The DSP Technology 2190 Multichannel Scaling Averager consists
of a pair of CAMAC modules: the 2090S Multichannel Scaling module
and the 4101 Averaging Memory module. These two modules must
occupy consecutive slots in the CAMAC crate, with the 2090S in
the lower-numbered slot. There is no entry for the 4101 module
in the config file.
Description:
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Description for all Multichannel Data Acquisition devices.
Function Reference:
mca_par("run")-
programs the MCS for the number of bins and sweeps set with
the functions described below, then enables any other counters
and starts the averaging process. When the programmed number
of sweeps is completed, the MCS will generate a CAMAC LAM,
which will cause the other counters to be disabled.
Use the
wait() function to determine when the programmed
number of sweeps are complete.
mca_par("halt")-
halts the MCS and disables the other counters.
mca_par("bins")-
returns the number of bins in each sweep. (Referred to in the
module documentation as "record length").
mca_par("bins",value)-
sets the number of bins in each sweep to
value .
The number of bins can range from 8 to 32,767.
mca_par("sweeps")-
returns the number of sweeps to be summed.
mca_par("sweeps",value)-
sets the number of sweeps to be summed in the next scan
to
value . The number of sweeps can range
from 1 to 65,536.
mca_par("sweeps_comp")-
returns the number of sweeps completed in the previous scan.
An error message is printed if this function is called while a
scan is in progress.
mca_par("first_ch")-
returns the first channel to be read out using
mca_get() .
mca_par("first_ch",value)-
sets the first channel to be read out using
mca_get()
to value
mca_par("npts")-
returns the number of channels to be read out using
mca_get() .
mca_par("npts",value)-
sets the number of channels to be read out using
mca_get()
to value
Note that the mca_get() function cannot be used while the
MCS module is taking data.
Note that the 4101 doesn't actually average the sweeps, but only
accumulates sums in each channel. To obtain an average, you must
divide the data in each channel by the number of sweeps. The
averaging scan will halt before the programmed number of sweeps
is completed if any of the channels overflow.
The module expects an external trigger and the external trigger
is required to begin each sweep.
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mca_sel("?")-
Lists the configured MCA devices and indicates which
device is currently selected for the
mca_get() ,
mca_put() and mca_par() functions with an
asterisk. Also displays the MCA
device number for use with the mca_sget() ,
mca_sput() and mca_spar() functions and displays
whether the presence test found the unit unresponsive or if the
user has disabled the unit. Returns the total number of
MCA devices recognized in the config file.
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