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Sweep/Control
More Information
Selecting
Uncompensated means that the actual gate delay is as you sets it.
Selecting
Delay Until RBW Settled causes the gate delay to be increased above the user setting by an
amount equal to 3.06/RBW. This compensated delay causes the GATE START and GATE STOP lines
on the display to move by the compensation amount, and the actual hardware gate delay to be increased
by the same amount. All the other gate lines (for example, MIN FAST) are unaffected. If the RBW
subsequently changes, the compensation is readjusted for the new RBW. The value shown on the
Gate
Delay
key does NOT change.
Delay Until RBW Settled allows excellent measurements of gated signals, by allowing the IF to settle
following any transient that affects the burst. Excellent measurements also require that the analysis
region not extend into the region affected by the falling edge of the burst. Thus, excellent measurements
can only be made over a width that declines with narrowing RBWs, which is achieved by decreasing the
gate length below the user setting by an amount equal to 2.53/RBW. Therefore, for general purpose
compensation, you will still want to change the gate length with changes in RBW even if the gate delay
is compensated. The compensated Gate Length is limited by the analyzer so that it will never go below
10% of the value shown on the Gate Length key, as otherwise the sweep times could get very long.
Anytime the
Gate Length and RBW values combine in such a way that this limiting takes place, a
warning is displayed . For measurements which contain multiple sweeps with different RBW like SEM
and SPUR, the smallest RBW is used for this limiting.
Selecting
Compensate for RBW Group Delay causes the gate delay to be increased above the user
setting by an amount equal to 1.81/RBW. This compensated delay causes the GATE START, GATE
Notes: Although this function is Meas Global, there are some measurements that do
not support this function. In those measurements the operation will be
Uncompensated. Going into one of those measurements will not change the
Meas Global selection; it will simply display the grayed-out menu key with
“Uncompensated” showing as the selection. This is a non-forceful grayout, so
the SCPI command is still accepted.
If Gate Delay Compensation is not supported at all within a particular mode,
the key is not displayed, and if the SCPI command is sent while in a
measurement within that mode, an “Undefined Header” message is generated.
Measurements that do not support this function include:
Swept SA
Preset: TD-SCDMA mode: Compensate for RBW Group Delay
All other modes: Delay Until RBW Settled
State Saved: Saved in instrument state
Range: Uncompensated|Delay Until RBW Settled|Compensate for RBW Group
Delay
Readback text: Uncompensated|Settled|Group Delay
Initial S/W Revision: Prior to A.02.00
Modified at S/W Revision: A.11.0