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39
Table 3. Time Constants
10 μs
3 ms
1 s
300 s
30 μs
10 ms
3 s
1000 s
100 μs
30 ms
10 s
3000 s
300 μs
100 ms
30 s
1 ms
300 ms
100 s
The greater the time constant is, the smaller the ENBW is, the longer the system response is and the higher the
measurement accuracy.
3.3.4 < Filter dB/oct >: Setting the Roll off Slope of the Low Pass Filter
<6dB/oct>
The roll off slope is 6 dB/oct.
<12dB/oct>
The roll off slope is 12 dB/oct.
<18dB/oct>
The roll off slope is 18 dB/oct.
<24dB/oct>
The roll off slope is 24 dB/oct.
If the measure accuracy is same, the greater the roll of slope of filter is, the smaller the time constant is. And this
will cause faster response..
3.3.5 < Synchronous >: Setting the Status of the Synchronous Filter
<OFF>
Close the synchronous filter.
<200Hz>
Open the synchronous filter. It’s useful at a low reference frequency (< 200 Hz). When the input
signal frequency is very low, the low pass filter can’t get stable results or it needs a long time to do
that. At this time, synchronous filter helps.
Note that if the synchronous filter is open, <Filter dB/oct> must be <18 dB/oct> or <24 dB/oct >!
3.4 [DISPLAY]
Press [DISPLAY] button and enter the submenu as is shown in Fig.25. In this submenu, there are 4 function
settings: <Monitor> <Display & Scale> <Equation> and <Disp More>. They can be chosen and set by the soft keys
beside the submenu.
