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
1

Signal input

 
1. Signal input
Selects the digital input
2

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

 
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.
4

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.
5

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.
Unit
measuring unit
1 1/min ->
conversion factor