234 Chapter 4
Instrument Functions: P - Z
SWEEP
Instrument Functions: P - Z
Remote Command:
[:SENSe]:SWEep:TIME:AUTO:RULes NORMal|ACCuracy
[:SENSe]:SWEep:TIME:AUTO:RULes?
Example: SWE:TIME:AUTO:RUL ACC
4.8.4 Gate
Turns the gate function on and off. When set On, the LO (local oscillator) sweeps whenever
the gate conditions are satisfied by the signal at the
Gate Source selected under Gate Setup.
Turning on the
Gate turns off Gate View (described below).
NOTE Some instruments require a hardware upgrade before gating can be used.
Because the LO is gated, the analyzer only sweeps while the gate is enabled. A complete sweep may
require several gate events. The analyzer starts sweeping when the gate signal is enabled and stops
when it is disabled, then continues sweeping when it is again enabled, etc. until the sweep is
complete. So, the actual sweep time may be longer than the displayed time since it assumes that the
instrument is sweeping continuously, not stopping and starting in response to the gating signal. In
addition, the sweep time can be five times slower then expected because the measurement is using
a short gate delay or a short gate length. This slowing is needed because the resulting resolution
bandwidth does not allow the required hardware settling time before starting to sweep.
NOTE The enabled/disabled state of the gate appears at the TRIGGER 2 OUT rear panel
connector. A TTL high output indicates that the gate function is enabled. This is
always true, whether the Gate itself is turned On or Off (except during alignments).
Option 124 is a Video Out connection. The y-axis video out signal is not available
when gating is being used.
Key Path:
Sweep
Dependencies/
Couplings:
Gate is unavailable/off when:
• FFT & Sweep setting is Manual:FFT
• Signal Track on
• Marker Count on
These function are unavailable whenever Gate is on:
• Manual:FFT
• Signal Track
• Presel Center
• Marker Count (frequency counter function)
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