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█ © Brüel & Kjaer Vibro ● S1079330.002 / V04
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16.1.8 X (Tracking Filter)
The X column sets the tracking filter for the measurement (when applicable). Tracking filters can be
set from 0.01 to 15.99. A radial vibration measurement has two standard tracking filter measurements
(1X, and 2X). A tracking filter includes both an amplitude and a phase measurement.
To change (for example) the existing 2X tracking filter to 0.5X, simply edit the X field (from 2 to 0.5).
Don’t forget to also change the measurement name from 2X Amplitude to 0.5X Amplitude.
Figure 16-4) Modify nX tracking filter
16.1.9 Clamp & 2 mA Clamp
The Modbus output values will clamp (freeze) to this scaling value when the channel is bypassed or
faulted. The default value is 0 (i.e. 0 mils pp)
The Analog value will also clamp to this value when the channel is bypassed or faulted. If the clamp
value is 0 (i.e. 0 mils pp) the output will clamp to 4 mA. If 2mA Clamp is enabled the analog output will
clamp to 2 mA.
Example 1: Radial Vibration channel, Scale = 0-10 mils pp, Clamp = 0 (0 is at bottom scale). If the
channel goes Not OK, Modbus will send 0 mils pp. The analog output will be 4 mA.
Example 2: Axial channel, Scale = -40 to 0 to +40 mils, Clamp = 0 (0 is at midscale). If the channel is
bypassed the Modbus value will send 0 mils. In Modbus scaled data (i.e. 0-65535) midscale is 32767
(0 mils). For the analog signal midscale is 12 mA.
The default clamp value is 0. It is rarely changed.
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