KMPS-1-64 Manual
12/18
KM 8000 Rev. A
Page 22 of 40
Copyright © 2018 Kulite Semiconductor Products, Inc.
All Rights Reserved.
4.6
Pressure Data Rate
The data rate of the KMPS acquisition is set using the SAmplerate commands. In general the
lowest data rate possible should be used as any pressure fluctuations due to tubing will be
eliminated in this way. When higher data rates are needed the use of streaming data is
necessary as the polling speed of the KMPS is only a few cycles per second. For RS-485
scanners it is also necessary to use a baud rate high enough to support the output rate
desired. If the baud rate is too slow it will pause the acquisitions while the data is output. Use
of the time stamp can help test whether the baud rate is sufficient.
The data rates available are:
0
– 275 samples/second/channel
1
– 200 samples/second/channel
2
– 125 samples/second/channel
3
– 80 samples/second/channel
4
– 40 samples/second/channel
5
– 25 samples/second/channel
These sample rates are given assuming all 64 channels are sampled. If fewer channels are
selected than higher data rates can be achieved. For example if half of the channels are
selected the data rate will be twice as high.
SAmple
Sets or returns the sample rate. Set in programming mode only.
SAmple TRue
Sets or returns the actual sampling rate taking into effect temperature
sampling rate and other effects. Set in programming mode only.
SAmple LIst
Returns available sampling rates. Can be used with TRue to show actual
sampling rates.
SAmple
LOw/HIgh
Sets the KMPS-4 to low speed sampling mode allowing for cable lengths
longer than 2 meters. Can be used with the True switch to see new
sampling rates. Set in programming mode only. The KMPS must be reset
to take effect.
Table 10 : Sample rate commands
4.7
Temperature Data Rate
The temperature of the pressure transducers is measured to do thermal compensation. These
temperatures are not measured continuously in order to devote more time to pressure
acquisition. The user can select how often the temperature is measured. Every time the
temperature is measured there will be a pause, in the pressure sampling, equivalent to
approximately two cycles. For example if the sample rate is set to 40 samples/channel/second
for that second the user will only see 38 samples. If the KMPS is in a relatively stable thermal
environment then this setting can be high. The rate is set by the SAmplerate TEmperature
command.
The sampling rates available are:
0
– Every 15 Seconds
1
– Every 30 Seconds
2
– Every 1 Minute
3
– Every 2 Minutes
Summary of Contents for KMPS-1-64 Series
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