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N432A Thermistor Power Meter

Data Sheets

Data Sheet

Why Keysight’s Power Meters and Sensors?

Keysight’s only power meter that supports thermistor mount with useful enhancements for metrology and calibration lab environments.

Reliable, high-performing solutions

Every power meter and sensor from Keysight consistently delivers great results.

A sure investment for many years to come

Code-compatibility between power meters reduces the need for re-coding. Not only that, all Keysight power meters are backward-compatible with most legacy power sensors.

One specific application: One right solution

Keysight offers a wide selection of power meters and sensors for practically all application needs—wireless communications, radar pulse measurements, component test, and more.

Global network support

No matter where you are, Keysight is committed to giving you the 24-hour support you need regarding our products, applications, or services.

Keysight’s power meters have long been recognized as the industry standard for RF and microwave power measurements.

Key features

- Frequency range: 100 kHz to 18 GHz (sensor dependent)

- Power range: –30 dBm (1 μW) to +10 dBm (10 mW)

- High accuracy ± (0.1% of reading + 0.5 μW), excellent for 1 mW transfer calibration (with 478A-H75)

- Built in 6.5 digit ADC eliminates the need of external DMM

- Selectable bridge resistance (100/200/300/400 Ω)

- Remote interface flexibility

- DC substitution measurement, traceable to the U.S. National Institute of Standards and Technology (NIST)

We Listened to the Industry, Then Delivered a Better and Easier Replacement Solution for the Legacy 432A Analog Power Meter

As today’s power measurements become more complex, it is increasingly difficult to make reliable, accurate power measurements. For more than 40 years, you’ve depended on Keysight’s 432A analog power meter, used with temperature compensated thermistor sensors to provide high accuracy over a wide temperature range.

Today, the Keysight N432A digital thermistor power meter, loaded with enhancements, including a color digital display, and intuitive front panel interface will continue support your measurement needs with greater capability and expanded functionality. Best of all, you can get these extras at just a fraction of the price of the legacy 432A.

LXI Class-C compliant N432A

The N432A is a single-channel, average RF power measurement meter that supports thermistor sensors. The N432A has the capability to measure and display average power, RF bridge voltages (VRF0 and VRF1), compensation bridge voltages (VCOMP0 and VCOMP1), V0, and V1. It is also provided with a set of features such as zeroing and a built-in self-test.

Developed using LXI technology, the N432A is an LXI Class-C compliant instrument 1 . The N432A basic configuration consists of two key sections: bridge and meter logic.

When a compatible thermistor sensor is connected to the N432A, the RF and compensation bridge circuits are formed in the bridge section. VRF, which is the voltage at the top of the RF bridge, is responsive to both input RF power and ambient temperature changes.

On the other hand, VCOMP, which is the voltage at the top of the compensation bridge, is responsive only to ambient temperature changes. The VRF and VCOMP values are used in calculating the RF power. Meanwhile, the meter logic section processes VRF and VCOMP to produce a meter current proportional to RF power.

In general, the N432A is an easy-to-use instrument, especially with the availability of an integrated Web browser that provides a convenient way to view and modify the instrument network configuration.

Besides the LAN interface, the N432A also supports industry standard GPIB and USB interfaces for measurement automation.

High accuracy—no thermoelectric error

The high accuracy ± (0.1% of reading + 0.5 μW) over a wide temperature range featured in the legacy 432A power meter is also included in the N432A, making it excellent for 1 mW transfer calibration (with 478A-H75/H761). Accuracy can be maintained on even the most sensitive range as the error due to thermoelectric effect is reduced to a negligible level.

Sensor compatibility

The N432A is compatible with the Keysight 478A and 8478B thermistor sensors. The following table lists the frequency range and operating resistance for these two sensors.

Mechanical characteristic

Mechanical characteristics such as center conductor protrusion and pin depth are not performance specifications. They are, however, important supplemental characteristics related to electrical performance. At no time should the pin depth of the connector be protruding.

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