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Making Measurements
Using Limit Lines to Test a Device
50 ms of sweep cycle time. Because the limit test will still work if the limits lines are off,
selecting is also optional.
The limit test results appear on the right side on the analyzer display. The analyzer indicates whether the
filter passes or fails the defined limit test:
• The message FAIL will appear on the right side of the display if the limit test fails.
• The analyzer beeps if the limit test fails and if has been selected.
• The analyzer changes the color of the trace to flashing red where the measurement trace is out of
limits.
• A TTL signal on the rear panel BNC connector "LIMIT TEST" provides a pass/fail (5 V/0 V) indication
of the limit test results.
Offsetting Limit Lines
The limit offset functions allow you to adjust the limit lines to the frequency and output level of your device.
For example, you could apply the stimulus offset feature for testing tunable filters. Or, you could apply the
amplitude offset feature for testing variable attenuators, or passband ripple in filters with variable loss.
This example shows you the offset feature and the limit test failure indications that can appear on the
analyzer display.
1. To offset all of the segments in the limit table by a fixed frequency (for example, 3 MHz), press:
The analyzer beeps and a FAIL notation appears on the analyzer display, as shown in Figure 1-65.
Figure 1-65 Example Stimulus Offset of Limit Lines
• To return to 0 Hz offset, press:
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