Manfred Weber
Metra Mess- und Frequenztechnik in Radebeul e.K.
PC Vibration Measurement System VibroMetra

Speed values

Speed values are measured at the digital inputs of the USB devices.
Speed values

Signal input

1. Signal input
Selects the digital input

Measurand and unit

2. Measurand and unit
Choose between:
Rotation speed:
Shows the rotation frequency with the selected unit.
User measurand:
See User defined measurand.
Available units are: Hz, 1/s, 1/min, 1/h


3. Characteristic
It can be selected between the mean value with an averaging duration of 1s and the instantaneous value. The latter one is recommended for fast changing speed.

Time window

4. Time window
The M312 is in general able to detect rotational speed of up to 6 1/min. But it requires 10 seconds measuring time to detect standstill. The minimum speed has to be increased in order to accelerate this process. For instance, a minimum speed of 30 1/min allows to detect standstill in 2 seconds, but then the rotational speed of less than 30 1/min is not detectable at all.

User defined measurand

5. User defined measurand
By multiplication with a factor the frequency signal can be transformed into another quantity, for example a track speed.
After selecting User measurand in the Measurand menu you may enter:
User defined
the name of your measurand.
measuring unit
1 1/min ->
conversion factor