EXT-02F User Manual
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version 4.2
page 5
In the following description of the front panel elements, each element has a number that is
related to that in Figure 1. The number is followed by the name (in uppercase letters) written
on the front panel and the type of the element (in lowercase letters). Then, a short description
of the element is given. Since the front panel elements for the two channel EXT-02F are
identical for each channel A and B (with identical functions and labels) these elements are
numbered and described only once (for channel A).
(1)
BALANCE x10mV meter
Analog BALANCE monitor that displays the OFFSET in the range of
±
30 mV and is used for optimal cancellation of the OFFSET.
(2)
HIGHPASS (Hz) switch
12-position switch for selecting the corner frequency of the single pole
HIGHPASS filter with -6 dB / octave. In OFF position the HIGHPASS filter
is disabled (DC recording).
Corner frequencies (Hz): 3, 30, 100, 300, 400, 500, 600, 800, 1k, 3k, 10k.
Note: A combination of both LOWPASS and HIGHPASS FILTER leads to a filter with
bandpass characteristics.
(3)
+ / - OVERLOAD LEDs
LEDs that indicate if the amplifier works at 10% below it’s positive or negative limit.
The linear range of the amplifier is
±
12 V.
(4)
LOWPASS (Hz) switch
12-position switch for selecting the corner frequency of the single pole
LOWPASS filter with -6 dB / octave. Corner frequencies: 30, 100, 300, 500,
700, 900, 1.3k, 1.5k, 1.7k, 3k, 10k, 20k Hz.
Note: A combination of both LOWPASS and HIGHPASS FILTER leads to a filter with
bandpass characteristics.
(5)
OFFSET range switch
(6)
Switch to set the range for the OFFSET potentiometer (#6).
±
1V corresponds to a range from -1000 mV to +1000 mV at the electrode
±
0.1V corresponds to a range from -100 mV to +100 mV at the electrode
