Keysight n1921a Operating And Service Manual page 21

3 To verify traceability to National Standards, hence, verifying your
As a confidence check of the connector integrity, the P-Series Wideband Power
Sensor can be connected to any known good signal source (for example, the
50 MHz, 0 dBm reference) and a comparison made.
The calibration factors are stored in the EEPROM during the manufacturing
process. All the compensation data is downloaded to the P-series power meter at
power-on or when the power sensor is connected.
Between 50 MHz and 500 MHz, the sensor is sensitive to the RF signal
NOTE
propagating through onto the Detector Amplifier Circuitry and resulting in
distorted power measurements. To reduce this effect, additional filtering is
switched into the measurement path, which results in a 15 MHz video
bandwidth limitation for signals below 500 MHz.
The P-Series Wideband Power Sensor performs internal zero and calibration
automatically upon AC power up. However, to perform a manual confidence
check with an external reference power source (1 mW, 50 Mhz) a 2.4 mm (f) to
N-type (m) adapter is needed as the P-Series Wideband Power Sensor is fitted
with a 2.4 mm (m) connector. This adapter is not shipped together with the
P-Series Wideband Power Sensor.
Keysight N1921A and N1922A Operating and Service Guide
This is achieved during the Internal Calibration, the Amplifier Circuitry is
isolated from the Diode Detectors by a network of transistor switches and the
sensor's voltage reference is routed to the Amplifier Circuitry.
measurements are going to perform to specification.
To achieve traceable and accurate RF power measurements, each sensor is
individually characterized during its production procedure. To achieve optimal
accuracy, a 3-dimensional correction is generated across power, frequency
and temperature. This uses advanced modeling techniques, and is superior in
accuracy and speed of evaluation to the overlaying of linearity, temperature
corrections and calibration factors.
Introduction 1
21