Andy,
We are moving to the “fast, high dynamic range” sweeps. This should work well for any filter with at least 10 kHz of bandwidth, group delay of less than 100 microseconds, and a starting frequency of > 10 kHz. It will give you about 90 dB of useable dynamic range. Do you have filters that fall outside these specs? If so, we are planning on including an enhanced TG CW utility that allows you to, for example, tune to a single frequency and adjust for maximum insertion loss. You should be able to measure well below 100 dB insertion loss this way, and manually step across your frequency of interest. Similarly, for filters with less than 10 kHz bandwidth, you can manually step across them in increments as small as 10 Hz.
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