EFA-200/-300 6 Operating modes
6-5
Selecting the frequency range
1. Press key F4 to open the FILTER sub-menu.
The functions for keys F1 to F4 change.
• Key F1: BROAD BAND
• Key F2: BAND PASS
• Key F3: BAND ST0OP
2. Use one of the keys F1 to F3 to select the filter required.
A selection list pops up.
3. Use the UP/DOWN keys to select the frequency range.
4. Press the ENTER key to confirm your selection.
The selected filter is shown in display field F4.
The measurement screen is displayed.
Entering a variable filter frequency
In addition to the fixed filter frequencies, you can enter one variable
frequency per filter in the range from 15 Hz to 2 kHz with a resolution of
0.1 Hz.
✓ The FILTER menu is open.
1. Press key F4.
The FILTR / VAR sub-menu opens.
The first digit of the active filter is highlighted in black.
2. Change the digit using the UP/DOWN keys.
3. Move to the next digit using the NEXT key.
4. Repeat steps 2 and 3 for the remaining digits.
5. Press the ENTER key to confirm the change.
The altered value is now present in the selection list for the active filter
and can be selected from there.
Fast switching between filters
The NEXT key can be used during the measurement to access a mode
allowing rapid switching between the various filters.
✓ The measurement screen is displayed.
1. Press the NEXT key.
The functions of keys F1 through F4 change.
• Key F1: BROAD BAND
• Key F2: BAND PASS
• Key F3: BAND STOP
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