AK-Protocol
F-7
Command
Response
Description
APH4 K0
APH4 E B17 B18 B19…B32
Non-Normalized Particle Size
Histogram (dN)
Particle concentration for upper 16
particle size bins averaged over
one second per size bin.
BX =
Particle concentration
of size bin X
Range:
0 to 9.9999E9 [#/cm³]
Format:
Float
Example: B32 = 1.2345E5
N o t e
The AK-SMAT Protocol was defined in 1991, and at that time not
designed to manage large data sets. Due to the protocol limitations,
two separate commands have to be issued to read the full particle size
histogram. With each reading of the lower particle size bins (command
APH1 or APH3), a new snapshot of the full particle size histogram,
total particle concentration and total particle mass is stored in memory.
These parameters can then be read subsequently to assure
consistency within a data set and prevent that data from being
overwritten between readings.
Data Read Sequence: Example 1
APH1 K0 Read Normalized Particle Size Histogram
(dN/dlogDp);
lower
16 particle size bins
APH2 K0 Read Normalized Particle Size Histogram
(dN/dlogDp);
upper
16 particle size bins
ATPM K0 Read Total Particle Mass
ATPC K0 Read Total Particle Concentration
AERR K0 Read instrument errors
Data Read Sequence: Example 2
APH3 K0 Read Non Normalized Particle Size Histogram
(dN);
lower
16 particle size bins
APH4 K0 Read Non Normalized Particle Size Histogram
(dN);
upper
16 particle size bins
ATPM K0 Read Total Particle Mass
ATPC K0 Read Total Particle Concentration
AERR K0 Read instrument errors
