Lambda SR1, Руководство по эксплуатации, Страница: 123 / 317

SR1 Operation 123
© 2014 Stanford Research Systems
10
-1
10
0
10
1
-70
-60
-50
-40
-30
-20
-10
0
10
Hardw are BP Filter for Analog HiBW Inputs
Notch Filter Tuning
The frequency of the tunable notch/bandpass filter can be set to a fixed frequency or tuned to one of
several sources. To select a fixed notch/bandpass frequency, select the "fixed" radio button at the right
of the Notch/BP panel. The fixed frequency is entered in the control which appears to the left of the radio
buttons. To select a tuned notch/bandpass filter press the "tuned" button and select the tuning source
from the drop-down control. When the tuning source is set to "Measured Freq." the notch/bandpass filter
tracks the measured frequency of the selected input. When set to one of the generator channels the
filter frequency follows the frequency of the selected channel. (When the generator is in mono mode
choose the "A" channel— if there are more than one waveform on the selected channel the first
waveform with a definite frequency (i.e. not noise) is chosen.) Sweep 1 follows the frequency of the
Inner
Sweep axis, while Sweep 2 follows the frequency of the outer sweep axis. In general it is better to select
one of the generator or sweep tuning sources instead of measured frequency when possible to eliminate
possible jitter in the filter frequency.