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From CAL

DAC

Zero and CAL

path switching

To wideband

amplifier and

100 MHz sampler

Voltage

reference

Diode detectors

RF input

External calibration-free measurements

The P-Series power sensors are the first to provide

“internal zero and calibration” which eliminates the need

for sensor calibration using an external reference source.

Agilent’s patent-pending technology (see Figure 1) inte-

grates a dc reference source and switching circuits into

each power sensor, so that you can zero and calibrate the

sensor while it is connected to a device under test. This

feature removes the need for connection and disconnec-

tion from the calibration source, thereby reducing test

times, measurement uncertainty, and wear and tear on

connectors. It is especially useful in manufacturing and

automated test environments where every second and

every connection counts. Sensors can be embedded with-

in test fixtures without the need to switch in reference

signals.

Simplified correction factors

To ensure the accuracy of power measurements, a power

meter typically overlays many different sensor correction

factors including linearity, frequency, and temperature.

At higher bandwidths, this technique can become cum-

bersome and less than accurate.

To simplify the process and improve measurement speed

while preserving measurement accuracy, the P-Series

uses a four-dimensional (4-D) modeling technique that

measures input power, frequency, temperature, and out-

put voltage across the power sensor’s specified measure-

ment ranges. Data from this 4-D model is generated dur-

ing Agilent’s initial factory calibration of the sensor and

stored in EEPROM. Advanced algorithms are used to

quickly and accurately evaluate the sensors against this

model, without requiring the power meter to interpolate

the calibration factors and linearity curves. If you run

tests in which the frequency changes often, e.g. testing

multi-carrier amplifiers on different bands, you’ll notice

a marked improvement in measurement speed.

Compatibility with more than 30 Agilent sensors

The P-Series power meters also work with the Agilent

8480 Series, E-Series and N8480 Series power sensors.

This gives you a selection of more than 30 sensors for

power measurements over a wide dynamic range from

–70 to +44 dBm, with frequency coverage of 9 kHz to 110

GHz.

Figure 1. Internal zero and cal block diagram

1 2 3 4 5 6 7 8 ... 14 15

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