Datasheet

Page 10
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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 switching 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 approximately –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 Accuracy
1
(with exclusions).
Model Power range Accuracy
1
(25 °C ± 10 °C) Accuracy
1
(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 zeroing
3
– Number of averages = 1024
– After 30 minutes of power-on warm-up
Normal Mode Power Accuracy
1, 2
(with exclusions).
Model Power range 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 external zeroing
process, the RF input signal must be switched off or the device-under-test disconnected from the U2000 Series power sensor.
Specifications (Continued)