H Heuer Instruments UMDT51A, Руководство пользователя

Страница: 55 / 104

Making Measurements
LT51 User Manual 43
Selective Level Meter
In DMM mode, the LT51 can make selective level measurements over its full
frequency range from 200 Hz to 2.2 MHz with a BW around the centre frequency
of
25 Hz, 1.74 kHz or 3.1 kHz .
Selective measurements are made at the current centre frequency, by pressing
the key followed by the [f3] soft-key, and then choosing the BW.
Alternatively, the desired Centre Frequency can be entered directly, in which
case the 25 Hz BW is selected by default.
The level displayed is the RMS value over the BW, at the selected centre
frequency.
To cancel the selective level mode, press the key followed by the [f3] “BW”
soft-key,
and select “WIDE”