Agilent Technologies 54503A User's Guide download pdf (Page 251)

Chapter 4 251

Key Function Descriptions

Key Descriptions

The characteristics of these two types

of power change differently with

resolution bandwidth changes, so they

can be computed algebraically from

measurements in two bandwidths.

The impulsive powers for all

frequencies within each adjacent

channel are converted to an equivalent

voltage. These voltages are assumed to

be in phase so they are added to

compute a peak voltage in the channel

and a peak power is computed. The

random powers are all added within a

channel to give a peak random power.

The peak random power is added to the

peak impulsive power to give a peak

weighted power.

BURSTPWR METHOD Burst power, transient and

random peak average power

measurement This method performs

a measurement and computation to

ﬁnd the impulsive and random powers

similar to the two-bandwidth method,

but using a different and faster

technique.

It also uses an rms-responding

technique to compute a true power

ratio between the main and adjacent

channels, without peak weighting or

assumptions about phase relationships.

GATED METHOD Transient and random peak

measurement for TDMA This

method is the same as the

two-bandwidth method except that the

random and impulsive powers are

separated using a different technique.

Gated video techniques are used to

measure the response of just the peak

of the random part of the adjacent

channel power. A TTL-type trigger

signal must be connected to the

spectrum analyzer to do this

time-selective gating.

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