HP 8590 E-Series User Manual page 239

graphics unless the utility is entered with the new settings.
Front-Panel Key Access: f,sWEEP)
Option 105 only. Option 101 is recommended.
GATE CTL
determines if the gate is enabled on the edge of the trigger input or on a
EDGE LVL
threshold level of the input signal. If the gate control is set to EDGE, the edge
of the input signal triggers the timer for the gate delay. When the gate control
is set to LVL, the gate follows the positive level of the signal connected to
GATE TRIGGER INPUT.
When the gate control is set to level, the functions of gate delay and gate
length no longer apply and therefore, the GATE DELAY , GATE LENGTH , and
EDGE POL POS NEG softkeys are blanked. The gate utility does not allow level
triggering. The gate will automatically be set to edge trigger on entry to the
gate utility.
Front-Panel Key Access: [SWEEP]
Option 105 only. Option 101 is recommended.
GATE
sets the duration of the delay after an edge trigger before the gate switch
DELAY
closes. The gate delay can be set from 1 ps to 65.535 ms in 1 ps steps.
If the GATE DELAY softkey is accessed outside of the time gate utility, it turns
off the gate markers but does not affect the gate utility settings. When the
gate utility is entered, the current value of the gate delay will be used. The
GATE DELAY softkey can be accessed from within the gate utility under the
Define Gate menu.
Front-Panel Key Access: [m)
Option 105 only. Option 101 is recommended.
GATE
sets the duration of the gate. The gate length can be set from 1 ps to
LENGTH
65.535
If the GATE LENGTH softkey is accessed outside of the time gate utility it turns
off the gate markers but does not affect the gate utility settings. When the
gate utility is entered, the current value of the gate length will be used. The
GATE LENGTH softkey can be accessed from within the gate utility under the
Define Gate menu.
Front-Panel Key Access: [SWEEP)
Option 105 only. Option 101 is recommended.
GATE
turns on or off the gate for Option 105, the time-gated spectrum analyzer
ON OFF
capability. The gate can be turned on outside, or from within, the gate utility.
The gate utility makes it easier to set up and manipulate the gate.
If GATE ON OFF is accessed under the [SWEEP) menu it turns the gate on and
off. If GATE ON OFF is accessed under the Define Gate softkey from within
the gate utility, the gate can only be turned on when the frequency domain
window is active. If the time domain window is made active the gate will be
turned off. Gate manipulation with the gate turned on in the time domain
window is difficult due to trace dropouts and triggering errors.
Front-Panel Key Access: [SWEEP)
7-46 Key Descriptions
ms in 1 ,M steps.