User guide

71
Preamp
Controls the built-in amplifier on the signal input. This lowers the noise floor,
allowing very low power signals be detected, by giving a 24 dB nominal gain boost.
Note: Attenuation is automatically disabled to 0 when Preamp is
activated.
Note: The preamp should not be used with input signals greater than
-30 dBm.
Offset
Shifts the signal to compensate for external factors (attenuation, couplers,
amplifiers, etc.). This allows for a true signal level reading.
1. Measure the total amount of loss for all attached signal devices.
2. Enter the measured amount as the Offset value or gain.
Example - The system has 10 dB of loss due the use of a coupler;
enter the value of 10 in the Offset. Offset range is -100 to +100.
Units
Sets the units to be displayed on the graph.
dBm
dBuV
dBmV
dBV
Volts
Note: Selecting this unit will disable the Scale option. See “Scale” on
page 70.
Watts
Note: Selecting this unit will disable the Scale option. See “Scale” on
page 70.
dBm 10 Log Power Watts30dB+=
dBm dBuV 10

50log90––=
dBm dBmV 10

50log 30––=
dBm dBV 10

50log 30+–=
dBm 20 Log Power Volts= 30dB+
Watts 10

dBm 30–10=