### Time Domain Measurements

With option ZVAB-K2, Time Domain, you can view the measurement results as a function of time.

Setting up a time domain measurement

Using a time gate

#### To set up a time domain measurement...

1. Reset the analyzer to ensure that the following operating mode is set: Sweep Type: Lin. Frequency, Trace - Meas.: S21, Trace - Format: dB Mag.

2. Open the Trace - Meas menu and select the measured quantity to be transformed (preferably: an S-parameter or ratio).

3. Click Trace - Trace Func - Transform - Time Domain to transform the active trace to the time domain.

The transformed trace is displayed in the active diagram area. To refine the analysis, you can modify the number and position of the sweep points (Channel - Sweep - Number of Points, Channel - Stimulus), select a different transform type and window for profiling (Trace - Trace Func - Transform - Define Transform...
) and vary the time range (Trace - Trace Func - Transform - Time Domain Stimulus Axis...
).

#### To eliminate an unwanted response from the measured trace...

1. Calculate a time domain transform as described above, Setting up a time domain measurement
   .

2. Click Trace - Trace Func - Transform - Define Time Gate
   and place a time gate on the transformed trace. To remove a single response use a Notch gate type. To everything outside a specified area, use a Bandpass gate type.

3. Click Trace - Trace Func - Transform - Time Gate to enable the time gate. If necessary, go back to the Define Time Gate dialog to correct your time gate settings.

4. Click Trace - Trace Func - Transform - Frequency Domain.

The frequency domain trace now corresponds to the modified time domain trace which is transformed back into the frequency domain.