Setting Gate Shape - Agilent Technologies ENA Series User Manual

Analysis in Time Domain (Option 010)
Deleting Unnecessary Data in Time Domain (gating)
Operational procedure
Step 1. Press
which you want to set the gate type.
Step 2.
Step 3. Press

Setting gate shape

The gate is a filter whose shape looks like a band pass filter. There are several parameters
that indicate the gate shape. Figure 9-9 shows their definitions.
Figure 9-9 Parameters of gate shape
Table 9-1 compares the characteristics according to the gate shape. When the shape is
"minimum," the cutoff time is shorter and the response is deleted abruptly, but the sidelobe
level and band pass ripples become larger. When it is "maximum," cutoff is gentler, but the
sidelobe level and the band pass ripple become smaller. The minimum gate span in Table
9-1 is the minimum gate range you can set. This value is defined as the minimum gate span
necessary for the existence of the pass band and is equal to 2 times the cutoff time.
Table 9-6 Comparison of gate characteristics
Gate shape Passband ripple
±0.13 dB
Minimum
±0.01 dB
Normal
±0.01 dB
Wide
±0.01 dB
Maximum
346
(or
- Press to display the "Gating" menu.
Gating
to toggle between band pass (
Type
Sidelobe level
−48 dB
−68 dB
−57 dB
−70 dB
) and (or
) and notch (
Bandpass
Cutoff time
1.4/frequency span
2.8/frequency span
4.4/frequency span
12.7/frequency span
) to activate the trace for
).
Notch
Minimum gate span
2.8/frequency span
5.6/frequency span
8.8/frequency span
25.4/frequency span
Chapter 9