Specifications (continued)

Switching point

The U2000 Series power sensors have two measurement paths: a low power path and a high power path, as shown in the

table below.

Models

AUTO (default) range

Low power path

High power path

Switching point

U2000/1/2/4A

–60 to +20 dBm

–60 to –7 dBm

–7 to +20 dBm

–7 dBm

U2000/1/2H

–50 to +30 dBm

–50 to +3 dBm

+3 to +30 dBm

+3 dBm

U2000/1B

–30 to +44 dBm

–30 to +23 dBm

+23 to +44 dBm

+23 dBm

Each power sensor automatically

selects the proper power level path.

To avoid unnecessary switching when

the power level is close to the switch-

ing point, switching point hysteresis

has been added.

Offset at switching point:

≤ ± 0.5% (≤ ± 0.02 dB) typical

Switching point hysteresis:

± 0.5 dBm typical

Example with U2000 “A” suffix

sensors: Switching point for the

U2000/1/2/4A sensors is at –7 dBm.

Hysteresis causes the low power

path to remain selected until approxi-

mately –6.5 dBm as the power level

is increased. Above this power, the

high power path is selected. The high

power path remains selected until

approximately –7.5 dBm is reached

as the signal level decreases. Below

this power, the low power path is

selected.

Power accuracy

Average only Mode Power Accuracy1 (with exclusions)

Model

Power range

Accuracy1 (25 °C ± 10 °C)

Accuracy1 (0 °C to 55 °C)

U2000/1/2/4A

–60 to +20 dBm

±3.0%

±3.5%

U2000/1/2H

–50 to +30 dBm

±4.0%

±5.0%

U2000/1B

–30 to +44 dBm

±3.5%

±4.0%

Specifications valid with the following conditions:

– After zeroing3

– Number of averages = 1024

– After 30 minutes of power-on warm-up

Normal Mode Power Accuracy1, 2 (with exclusions)

Model

Power level

Accuracy (25 °C ± 10 °C)

U2000/1/2/A

–30 to +20 dBm

±4.0%

U2000/1/2H

–20 to +30 dBm

±5.0%

U2000/1B

0 to +44 dBm

±4.5%

1. This accuracy is essentially a combination of linearity, instrumentation accuracy, and traceability to absolute accuracy at 50 MHz, 0 dBm.

Note: Mismatch uncertainty, calibration factor uncertainty, and power level dependent terms (zero set, drift, and noise) are excluded in this

specification and specified elsewhere in the data sheet.

2. The accuracy for –7 to +1 dBm (U2000/1/2A), +3 to +11 dBm (U2000/1/2H), and +23 to +31 dBm (U2000/1B) power level will be dominated

by zero set and measurement noise. For overall accuracy, refer to the measurement uncertainty calculator which is available on the Keysight

Technologies Web site.

3. It is advisable to perform external zeroing on the U2000 Series power sensor for power measurement level below –30 dBm. During the exter-

nal zeroing process, the RF input signal must be switched off or the device-under-test disconnected from the U2000 Series power sensor.

10 | Keysight | U2000 Series USB Power Sensors - Data Sheet