Owner manual

Rockwell Automation Publication GMSI10-UM002D-EN-E - August 2012 45
The Enpac 2500 Data Collector Chapter 1
Acquisition Determines how the Enpac 2500 collects a signature when the measurement definition specifies just one average.
Autoranging Sets the input range during data collection.
• If Autoranging is set to Fixed or Aggressive, the software integration is used on all FFT measurements. This is to give improved dynamic range and
faster hardware settling times.
• If hardware integration is required, set Autoranging to Conservative.
• For all autoranging settings (including Fixed), the input range is automatically increased and the data retaken if clipping occurs. This means that
the final input range used will never be too low for the signal being measured.
Table 8 - Instrument Configuration Parameters
Parameter Description Value
Value Description
Single shot Measures a single average for the signature and then stops.
Continuous Default
Continuously measures the signature until you press Enter to stop the averaging. This will pause the acquisition. Press
the Continue function to restart the acquisition. Press Enter a second time to store the data.
Value Description
Aggressive Default
Limits the auto-ranging to 20 mV level and sets the range limits from 1% to 70% of range.
When the input is under-range, the instrument recalculates the most appropriate setting and begin data sampling. The
range will not be adjusted a second time or checked prior to data collection.
Use Aggressive autoranging when faster data collection is desired. When using Aggressive autoranging, set Auto Store to
Off, or set Auto Store Time to 2 seconds when Auto Store is set to On.
Conservative Allows auto-ranging to go as low as 2 mV and sets the range limits from 10% to 70% of range.
The instrument perform a series of checks prior to sampling data. This will result in longer data collection times and
potentially lengthy acquisition.
When the input is under-range, the instrument recalculates the most appropriate range setting and sample data to
make sure the range has been properly selected. In addition, the dynamic range will be adjusted several times prior to
data collection.
Use Conservative autoranging when large variations in signal amplitude are present for proper input range selection but
increases the settling time required.
Fixed No autoranging measurements are taken. Input range is set based on the transducer type and sensitivity.
For example, an accelerometer, the input range will be 5 V for 100 mV/G sensitivity or 500 mV for 10 mV/G sensitivity.
Transducer Input Range (EUs)
Accelerometer 50 g
Velocimeter 50 ips
Displacement probe 200 mils
Volts, A.C. 2 V