910-269-EN, Rev. B, June 2011
120 Chapter 6
Zooming is useful when inspecting particularly large or thick components when
detail is lost due to using long-screen ranges. You can use the zoom to look at small
sections of the test piece without disturbing the instrument’s original calibration.
6.9 Gate Alarms
The EPOCH 1000 Series features a variety of alarm configurations for each
measurement gate. In unrectified (RF) mode, these alarms can be used in positive,
negative, or dual gate modes.
By default, when an alarm condition is triggered, the EPOCH 1000 Series emits an
audible beep. The instrument also illuminates the red indicator, above the display
window, corresponding to the gate with which the alarm has been triggered. To
toggle the audible alarm on and off, see section
3.3.4 on page 76.
The three primary types of gate alarms are positive threshold, negative threshold, and
minimum depth.
6.9.1 Threshold Alarms
Threshold alarms can be set on gate 1, gate 2, and/or on the interface gate.
A positive logic alarm is triggered when a signal breaks the gate threshold. A negative
logic alarm is triggered when a signal drops out of the gate threshold.
When you set a threshold alarm, the appearance of the tick marks at the end of the
gate changes. For positive logic alarms, the tick marks point upward and for negative
logic alarms they point downward (see
Figure 6-7 on page 121).
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