EUTECH INSTRUMENTS ALPHA COND 500 - REV 4 Manual de Instalação descarregar pdf (Página 13)

MN100003 REV A (12/07/10)

Page 13

Gain: Press the gain key to increase the display

Resolution. In this mode, the vibration signal will be ampliﬁ ed

by 10 times. When this mode is turned on, you will observe a

gain icon in the lower left display. To turn off, press the gain key

again.

Application tip: This function is very useful for low level vibration measurement.

For example, the displacement level of a precision machine tool is typically within

1 um peak to peak.

 Caution: When you turn off the gain mode, the reading will take about 5 seconds to stabilize, because the rms

detector requires time to average out the previous signal with gain. When using the gain key, the vibration signal will

be ampliﬁ ed by 10 times to increase the s/n (signal to noise ratio). Also ampliﬁ ed is the dynamic range of the internal

A/D converter. The chart below shows the maximum range readings with and without gain.

Units Range with gain Range without gain

g (rms) 0.001~1.999 0.01~19.99

mm/s (0-p) 0.01~19.99 0.1~199.9

μm (p-p) 0.1~199.9 1~1999

Average/ Peak Hold: Pressing this key once selects the moving average mode.

Pressing this key again, selects the peak hold mode. Pressing this

key a 3rd time will disable this mode.

L Average: In the average mode, the meter calculates the average

value of the last 10 measurements (moving average) and display

the results. This is useful when vibration levels are not stable.

The moving average mode will provide a more stable reading by averaging the

collected data.

L Peak Hold: The meter will display the maximum value

over time. This mode is used to measure the maximum

vibration levels during a transient event. For example, you

may use peak hold to measure the resonance vibration level

during a start up process.

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EUTECH INSTRUMENTS ALPHA COND 500 - REV 4 Manual de Instalação Página 13