User Manual

Publication GMSI00-UM001A-EN-E - February 2005

Setting Up Measurements 47

Collecting magnitude measurements in multiple frequency bands

You can set up multiple measurement definitions at a location to collect

magnitude values for individual frequency bands. Use band filters to define the

different frequency bands in the measurement definitions. Make sure you

select None in the Band Filter dialog box. This forces the Enpac Ex to

collect a spectrum measurement. After you unload the measurement,

Emonitor calculates the magnitude values in the bands from the spectrum.

If your measurements include both magnitude and phase, the Enpac Ex can

collect up to eight orders. If your measurements include magnitude only, the

Enpac Ex can collect up to 200 orders.

Typical magnitude measurement definitions

Figure 3.7 shows the setup for a typical magnitude measurement definition

Figure 3.7 Magnitude measurement definition.

The following table shows the STD (Hz) 2000 collection specification.

The following table shows the transducer specification in the STD (Hz) 2000

collection specification.

Figure 3.8 shows the setup for a typical set of measurement definitions with

multiple frequency bands. Note that the filter specifications used in the tables

are not currently defined in the Emonitor database. To define a new filter

specification, select Setup > Band Filters and click New.

Table 3.5 Collection specification for magnitude measurement definition

Transducer Window Signal Detection Fmax Lines Phase Order Norm? Averages

Accelerometer Hanning Peak 2 kHz 400 No No 4 linear

Table 3.6 Transducer specification in STD (Hz) 2000 collection specification

Name Base Unit Input Type Units Calibration Value DC Offset