Dynatek Labs M6 - Manual (Page 3)

M6: Offering Outstanding Performance Under Pressure!
High-Performance Pressure
Transducers Offer Superior Results
The fluid in a test chamber in a heart valve tester is a dynamic
pressure environment, i.e., pressures change rapidly. For such
environments, it’s important to specify a pressure transducer with a
high natural or resonant frequency.
The M6 features optional high-performance pressure transducers
with a resonant frequency of 180,000 Hz. A rule of thumb for
pressure transducers states that the frequency-measuring limit for
transducers is 10% of the resonant frequency, which in the case of
the M6 transducer is 18,000 Hz. This high frequency ensures that
the M6 can easily measure the entire range of transient pressures
found in the test chambers.
Transducers used on competitive heart valve testers were found
to have resonant frequencies of around 200 Hz. This would mean
that their actual measuring limit would be only 20 Hz, based on the
10% rule. Such transducers could be a limiting factor in measuring
real-time pressure values in test chambers, since ASTM and ISO
standards require the sampling frequency to be at least 50 times
the frequency of the spike in effective closing pressure.
When you look for your next heart valve tester, look for the M6. Its
performance is outstanding under pressure!
Transducers with very high resonance frequencies can easily capture
transient pressure spikes as seen in closing events, allowing the
user to discriminate between closely grouped pressure values.