U2004A Agilent Technologies Test Equipment, U2004A Datasheet - Page 3

• Manufacturer Part Number: U2004A
• Description: USB Power Sensor; 9 kHz - 6 GHz
• Manufacturer: Agilent Technologies Test Equipment

Why Zeroing Is Important For U2000 Series USB Power
Sensor?
Zeroing a power sensor is performed to reduce zero offset and noise impact to
improve RF power measurement accuracy. The U2000 Series USB power sensor
has two types of zeroing, namely the Internal Zeroing (INT) and External Zeroing
(EXT)
When performing External Zeroing, the RF signal source (typically signal output
from a device under test) should be turned off or disconnected from the power
sensor input, then the power sensor is zeroed. For Internal Zeroing, the RF signal
source can be turned on or left connected to the power sensor input. The power
sensor will isolate the RF signal source from the diode sensor before zeroing.
Users are recommended to perform external zeroing for input signals power
below -30 dBm to obtain a maximum degree of accuracy in their measurements.
External Zeroing can be used for RF signal level that falls into the power dynamic
range (from –60 dBm to 20 dBm). Figure 1 shows the External Zeroing setting in
the N1918A Power Panel.
Figure 1: Setting External Zeroing (EXT) in the N1918A Power Panel
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The specifi cations stated in this data sheet are applicable for External Zeroing unless
otherwise specifi ed.
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