Figute 4.2 Band-Reject Response
4.1.3.4 Stopband Attenuation
Accurate stopband attenuation measurements require some simple precautions because of low level sig-
nals. The filter should be shielded with top and bottom covers in place. BNC cables ONLY should be used
between oscillator, volatmeter and filter, and no other instruments should be connceted.
Connect the oscilaltor at 3Vrms at 20kHz to channel 1.1. input of the filter.
Set the filter to a cutoff frequency of 1kHz with 0dB input and output gain.
Connect channel 1.1 output of the filter through a 6kHz passive high-pass filter as shown in Figure 4.3 to
the ac voltmeter.
Set the filter to the low-pass mode.
The filter output should be <-80dB (300uVrms).
Figure 4.3 High-Pass Filter
4.1.3.5 Pre-Filter and Post Filter Gain Accuracy
Set the filter to a cutoff frequency of 1kHz in the low-pass mode with 0dB input and output gain.
Apply 50mVrms at 100Hz to the channel 2.1 input.
Monitor the output of the filter with an ac voltmeter referenced to 0dB.
Set the filter CHANNEL dispay to 2.1.
Set the input gain to 20dB.
The output of the filter should be a sinewave and 20dB, ±0.2dB.
Set the input gain to 0dB and the output gain to 20dB.
The output of the filter should be a sinewave and 20dB, ±0.2dB.
Section 4 - Incoming Acceptance
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