Model 831 Manual Configuring a Measurement 14-7
Time
The Time setting is used to determine the run time for the
Timed Stop mode as described in Table 14-2.
Enable Measurement History
A history record is an average of
FFT records. The number of FFT
records in each history record is
controlled by the Count and/or Run
Mode as described in Table 14-2.
The Enable Measurement History setting enables the
storing of history records. The measurement history is
helpful as an automatic notebook to save each manual
measurement for tonal or THD analysis, or it can store a
time history for a waterfall graph or to illustrate a machine
run-up or run-down cycle to evaluate modes.
Range
The Range setting, in conjunction with the Gain setting,
determines the amplitude measurement range of the FFT as
illustrated in the Table 14-3.
+20 dB Gain
The +20 dB Gain setting, in conjunction with the Range
setting, determines the amplitude measurement range of the
FFT as illustrated in Table 14-3.
The maximum input levels shown are
for a typical microphone sensitivity
of 50mV/Pa
Table 14-3 Maximum Input for Range and Gain
Count
The Count setting is used with the Count Stop and the
Timed Stop modes to generate a count average measurement
as described in Table 14-2.
+20 dB Gain Off +20 dB Gain On
Normal 143 dB peak maximum 123 dB peak maximum
Low 110 dB peak maximum 90 dB peak maximum
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