3-Component Force Link, Type 9327C
Page 40
9327C_002-477e-05.10
Overload
Maximum value of the measurand with which a sensor can
be loaded without sustaining damage. This refers to a
safety margin and is not an extended measuring range.
The characteristics specified in the calibration certificate are
no longer guaranteed in the event of an overload. Never-
theless, measurements made during an overload in most
cases provide useful results.
pC (picocoulomb)
1 picocoulomb = 10
-12
coulomb. See "Coulomb".
piezoelectric
The characteristic of quartz crystals in which mechanical
loading produces a proportional electric charge.
quasistatic
Describes the ability of Kistler sensors and charge amplifiers
to undertake short-term measurements or DC-similar
measurements.
Range
see
"Measuring
range"
Scaling
Output voltage per unit of the measurand at the analog or
monitor output of a charge amplifier.
Sensitivity
Nominal value or calibrated value stated in the calibration
certificate of the change in signal produced by the sensor
per change in measurand.
Sensor
System which produces a definite change in the output
signal as a function of the change of the measurand acting
on it.
Temperature influence
see Annex 10.5.
Threshold
Smallest change in the measurand, which produces a
measurable change in the sensor signal. In practice, the
rule of thumb applies that the threshold is about two to
three times as large as the typical noise signal of a charge
amplifier. This value can, however, only be achieved in
dynamic measurements, whereas with quasistatic meas-
urements, drift and environmental influences are limiting
factors.
Time constant
The time constant describes the behavior of a high-pass filter
(RC element), and represents the time after which the signal
has fallen to 1/e of the output value. The time constant de-
pends on the measuring range selected on the charge ampli-
fier. Possible values vary from approx. 0,01 s in the most
sensitive range to approx. 100 000 s in the least sensitive
range. The largest possible time constant must be selected
for quasistatic measurements. The time constant enables the
measuring error to be estimated in relation to the measuring
duration. You will find detailed information on time con-
stants and sensitivity ranges in the operating instructions for
your charge amplifier.
