Agilent Technologies 1912A Bedienungsanleitung PDF herunterladen (Seite 4)

The new N1914A supports up to four channels for power measurement. There

are two optional add-on channels for use with the Agilent U2000 Series USB

power sensors in addition to the two channels for conventional Agilent power

sensors. The additional two USB power sensors can be connected to the front

and rear panel USB ports of the N1913/1914A.

The N1914A is able to display four power measurement (average only) readings

if all four channels are connected with power sensors. By default, the power

meter will display Channel A on the upper window and Channel B on the lower

window when two sensors are connected to the meter. Channel C and Channel

D will be displayed when the two USB power sensors are connected to the

meter. The meter also can measure and display mathematical results from any

channel, such as A/B and B/C. This feature is especially useful when the user

needs to directly obtain the values of parameters such as gain, return loss, and

other network-analysis measurements.

Figure 3. Four-channel setup on N1914A (with two additional USB power sensors)

One of the application examples for multiple-channel power measurement is

the two-port load-pull system shown in Figure 4. Channel A shows the incident

power to the device under test (DUT), Channel B represents the reflected power,

and Channel C shows the output power from the DUT. While monitoring all the

power measurement results on the meter (Channels A, B, and C), the output

tuner is adjusted until the reflected power is zero (Channel B). The gain and the

power-added efficiency (PAE) can then be directly measured and displayed on

the meter.

Four-Channel Power

Measurement

Signal generator

Load

Input tuner

Output tuner

Directional coupler

DUT

Power meter

and sensor C

Power meter

and sensor A

Power meter

and sensor B

Figure 4. Typical load-pull application with three channels of power measurement

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Agilent Technologies 1912A Bedienungsanleitung Seite 4