2 Operating Information
28 U2000 Series Operating and Service Guide
The default is “AUTO”. In AUTO the range crossover value depends on the
sensor model being used (see Table 2- 2).
Tab le 2- 2 Range Crossover Values
Measurement Considerations
While auto- ranging is a good starting point, it is not ideal for all
measurements. Signal conditions such as crest factor or duty cycle may
cause the power sensor to select a range which is not the optimum
configuration for your specific measurement needs. Signals with average
power levels close to the range switch point require you to consider your
needs for measurement accuracy and speed.
For example, a U2000/1/4A sensor, where the range switch point is –7 ± 1
dBm in a pulsed signal, should be configured as follows:
The calculated average power is –12 dBm.
Accuracy
The value of –12 dBm lies in the lower range of the U2000/1/4A sensor.
In auto- ranging mode (“AUTO”), the U2000/1/4A sensor determines the
average power level is below –7 dBm and selecs the low power path.
However, the peak amplitude of –6 dBm is beyond the specified square
law response range of the low power path diodes. The high power path
(–7 dBm to +20 dBm) should be used to ensure a more accurate
Sensor Range Crossover Values
U2000A, U2001A, U2002A, U2004A –7 dBm + 1 dB
U2000H, U2001H, U2002H +3 dBm +
1 dB
U2000B, U2001B
+23 dBm + 1 dB
Characteristic Value
Peak Amplitude –6 dBm
Duty Cycle 25%
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