Analog Outputs with Short Time Constants

Gain and Time Constant Menu

	<165	10 s
	<175	30 s
12 dB/oct	DC gain (dB)	min time constant
	<55	10 µs
	<75	30 µs
	<95	100 µs
	<115	300 µs
	<135	1 ms
	<155	3 ms
	<175	10 ms
18 dB/oct	DC gain (dB)	min time constant
	<62	10 µs
	<92	30 µs
	<122	100 µs
	<152	300 µs
	<182	1 ms
24 dB/oct	DC gain (dB)	min time constant
	<72	10 µs
	<112	30 µs
	<152	100 µs
	<182	300 µs

To use these tables, choose the correct table for the filter slope in use. Calculate the DC gain by adding the reserve to the expand (expressed in dB). Find the smallest DC gain entry which is larger than the gain in use. Read the minimum time constant for this entry. For example, if the slope is 12 dB/oct, the reserve is 65 dB, and the X expand is 10 (20 dB), then the DC gain is 85 dB and the min time constant is 100 µs.

Time constant is a low priority parameter. If the sensitivity, dynamic reserve, or filter slope change, and the present time constant is below the new minimum, the time constant WILL change to the new minimum. Remember, changing the sensitivity may change the reserve and thus change the time constant.

Choosing a short time constant limits the amount of expand available. The X and Y expands may not be increased such that the present time constant will be shorter than the minimum time constant for the reserve plus expand. Changing the expand does NOT change the time constant.

Displayed below the time constant in the menu is the equivalent noise bandwidth (ENBW) of the low pass filter. This is the measurement band- width for Gaussian noise and depends upon the time constant and filter slope. (See the Noise discussion in the SR850 Basics section.)

When using short time constants below 10 ms, the X and Y analog out- puts from the rear panel or the CH1 and CH2 outputs configured to output X or Y should be used. These outputs have a 100 kHz bandwidth and are accurate even with short time constants. Trace outputs are updated at a 512 Hz rate, as are the R and θ outputs. These outputs do not accurately reflect high frequency outputs.

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SR850 specifications

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SRS Labs SR850 manual Analog Outputs with Short Time Constants

Models: SR850

Gain and Time Constant Menu

Analog Outputs with Short Time Constants

SR850 specifications