1-94
Making Measurements
Using Bandwidth Limits to Test a Bandpass Filter
3. Substitute a thru for the device and perform a response calibration by pressing:
4. Reconnect your test device.
Refer to Figure 1-73.
Setting Up the Bandwidth Limits
When you set up the bandwidth limits to test the bandpass filter, you will set
• the amplitude below the peak that is used to measure the filter’s bandwidth. This
setting is called N dB Points.
• the Maximum Bandwidth value. If the measured bandwidth is greater than this value,
the test will fail.
• the Minimum Bandwidth value. If the measured bandwidth is less than this value, the
test will fail.
1. To access the bandwidth menu, press:
2. To set the amplitude below the peak passband amplitude that you want to measure the
bandwidth. In this case, we are setting the bandwidth that will be measured 40 dB
below the peak amplitude of the bandpass filter by pressing:
3. To set the minimum bandwidth for the bandwidth test, press:
4. To set the maximum bandwidth for the bandwidth test, press:
Running a Bandwidth Test
After setting up the bandwidth limits, you are ready to run the bandwidth test and check
the test results. For this example, we will:
• Start the test.
• Display the bandwidth markers.
• Review the test results.
Cal
CALIBRATE MENU
RESPONSE
THRU
System
LIMIT MENU
BANDWIDTH LIMIT
N DB POINTS
40 x1
MINIMUM BANDWIDTH
100
M/µ
MAXIMUM BANDWIDTH
150
M/µ