Keysight N9340B Demo Manual page 12

Section 7
Limit Lines and Pass/Fail Testing: Creating a Mask with Limit Lines
Figure 4. FM signal with limit lines
In many onsite test situations, it is necessary to quickly test a signal to see
whether or not it meets a specifi cation for frequency and amplitude. For
example, during radio transmitter service and maintenance, the technician
would want to make sure that the center frequency of a carrier and its harmonic
fall within a certain frequency and amplitude mask.
Limit lines make it easy to set up pass/fail testing. The analyzer compares
trace data to a set of amplitude and frequency parameters while the analyzer is
sweeping the measurement range.
Instruction
Connect the signal to the RF IN connec-
tor. Set center frequency and span.
Quit digital edit state.
Open the limit menu.
Activate the limit lines.
Open the limit lines edit menu.
There are two ways to edit limit lines:
limit points and limits table.
Edit the point 0.
Note: For other points, you only need to press {Add} and enter the frequency and amplitude.
Firmware above A.01.02 will support 100 limit points.
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Key strokes
[Preset], [FREQ], {Center Freq},
[100], {MHz}, [Span], [1], {MHz}
[ESC/CLR]
[Limit]
{Limit {On}}
{Edit Limits}
{Limits Table}
{Frequency}, [99.5] {MHz}, {Ampli-
tude}, [48], {–dBm}