C-26 Model 3321 Aerodynamic Particle Sizer
Spectrometer
Aerodynamic (TOF) Data Record (D)
CS,D,ANX,tindex,ffff,stime,dtime,evt1,evt3,evt4,total,d1,d2,d3,... dn
CS = Checksum
D = Aerodynamic Data Record
A = A for Averaging Mode
S for Summed Mode
C for Correlated Mode
N = N for normal operation
A if in autocal mode
D if in autocal and autocal was “done” at the beginning of this
sample
X = X for spare position
tindex = time index 0 to sample time value - 1
(note if enabled for unpolled operation the
record is always reported when tindex = 0)
ffff = 4 digit hex value for status flags (see RF command)
stime = sample time not corrected for dead time
dtime = dead time (ms for 3321, µs for 3320)
evt1 = number of single hump events
evt3 = number of 3+ hump events
evt4 = number of timer overflow events
total = total (2-hump) particles measured (sum of reported
channels, evt 2)
d1... dn = particle counts in calibrated diameter channels (n determined
by SCA data usually 52)
SS Data Record (S)
CS,S,ANX,tindex,ffff,stime,dtime,evt1,evt3,evt4,total,h1,h2,h3,... hn
CS = Checksum
S = Side Scatter Data Record
A = A for Averaging Mode
S for Summed Mode
C for Correlated Mode
N = N for normal operation
A if in autocal mode
D if in autocal and autocal was “done” at the beginning of
this sample
X = X for spare position
tindex = time index 0 to sample time value - 1
(note if enabled for unpolled operation the
record is always reported when tindex = 0)
ffff = 4 digit hex value for status flags (see RF command)
stime = sample time not corrected for dead time
dtime = dead time (ms for 3321, µs for 3320)
evt1 = number of single hump events
evt3 = number of 3+ hump events
evt4 = number of timer overflow events
total = total (2-hump) particles measured (sum of reported
channels, evt 2)
h1... hn = particle counts in SS channels (n set by SCR command)
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