BNC 1201 - 6 1/2 Digit Digital Multimeter - Manual (Page 54)

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4.1.2 Filter
Filter is used to remove noises in measurement readings. 1201 is
equipped with two types of filters: AC filter and digital filter. AC filter is
for AC measurements only. It also affects the speed of the multimeter
to yield a measurement reading. Digital filter further stabilizes the
measurement readings by averaging. Both of them are described in
detail in the subsequent sections respectively.
4.1.2.1 AC Filter
Definition:
User is allowed to set the bandwidth for selecting one of the three AC
filters (Slow, Medium and Fast), in order to achieve either higher
accuracy in low frequency measurements or faster AC settling time.
Defaults
The factory default is 20 Hz (Medium). Users can select their filter type as
they wish when setting bandwidth value. The selection is stored in a
volatile memory and the default setting will be restored when the meter
is power-off.
Bandwidth AC Filter
Time
( seconds per reading)
3 Hz ~ 300 KHz Slow 7
20 Hz ~ 300 KHz Medium 1
200 Hz ~ 300 KHz Fast 0.1
Table 4-2
How to set AC Filter in AC measurements:
User can set the AC Filter either through the front panel operation or
through the remote interface operation.