User`s guide

2 General Power Meter Functions

70 N1911A/1912A P-Series Power Meters User’s Guide

Slope The current setting is displayed below the label and the

or symbol is displayed in single numeric display mode. (and ) is

used to generate the trigger from an increasing power level. Similarly,

(and ) is used to generate the trigger from a decreasing power level. To

change the setting, press to highlight or as required.

Holdoff The current setting is displayed below the label. After a

trigger event occurs, the trigger mechanism is disabled for the configured

time period. This allows stable triggering to be achieved even when a

signal has multiple edges, for example, a TDMA signal with non- constant

amplitude modulation. Values up to 400 ms can be configured.

To change the setting press and use the numeric keypad to enter

the required value in the Trigger Holdoff pop- up window to enter the new

value.

Figure 2-56 Trigger Holdoff pop-up

Complete the entry by pressing , or .

Hysteresis is only available when trigger mode has been

selected. The current setting is displayed below the label. You

can use the hysteresis function to help generate a more stable trigger by

preventing triggering unless the RF power level achieves the trigger level

and the additional hysteresis value. It can be applied to both rising and

falling edge trigger generation. A maximum of 3 dB hysteresis can be

entered.

Rising Edge

When a rising power transition triggers the power meter, the triggering

system is disabled. The power meter does not trigger again if another

rising power transition is presented. The triggering system is re- armed

only when the input power falls below a level equal to the trigger level

minus the configured hysteresis value.

Slope

–

Slope

–

Holdoff

Hysteresis

Norm

Hysteresis