HMG 3010
Page 25
Edition 2013-03-26 - V04 R01
Part No.: 669855
Input channels I and J are for digital (not
analogue) signals. As the input signal you
can choose between
Count pulses
and
Frequency signal
. There are many possibil-
ities for this, e.g. speed sensors, proximity
switches, pulse generators, flow rate meas-
uring instruments with a frequency signal,
HYDAC HDS 1000, to name only a few. As
in the case of the analogue sensor inputs,
settings can be manually entered for the
input signal, unit of measurement and deci-
mal format.
In addition to these settings, a
factor
has
to be entered which is required for con-
version to the desired unit of measure-
ment.
Another special feature is that the
Upper
measurem. range
must be input. Frequen-
cies of up to 30000 Hz can be measured on
channels I and J, consequently a scale from
0 to 30000 is possible in the graphical dis-
play. If, for example, you record a speed of
up to 1450 rpm, an awkward Y-axis scale will
result in the graph. If you enter "1500" as
the
Upper measurement range
for this
speed measurement, for example, the Y-axis
in the graph will be scaled from 0 to
1500 rpm.
In this case the reason for inputting the upper measurement range is just a means of limiting
the scale of the Y-axis in the graphical display. You should set this value as close as possi-
ble to that of the expected measured value in order to get the best possible graphical dis-
play.
If there are measured values higher than the upper measurement range, these are not lost.
The scale of the Y-axis can be changed again in the graph at any time later on.
Caution!
The measurement range of the frequency entries is 1 Hz to 30000 Hz. If, for example, the
rpm of a motor is recorded and this motor stops abruptly, the last rpm can still show in the
display for up to 2 seconds, depending on the measurement system, before 0 is displayed.