Technical data

Chapter 9 267

Channel Scanner

Using the Channel Scanner

Channel Scanner

Setting the Analyzer Input Gain

Normally the E7495A/B is set to add the most gain in the receive path to boost

low-level signals. If the signal is high, there is no reason to add gain. When you’re

measuring a strong signal, select low sensitivity to reduce the gain in the receive

path and lower the noise floor. For a low level signal, select High.

The Sensitivity setting is automatically switched to Low whenever the signal level

at the test set’s connector (that is, after any external attenuation has been applied)

rises above –10 dBm. You can use the Noise Correction feature to recover any lost

dynamic range.

NOTE The Sensitivity setting is coupled to the Noise Correction setting. Changing the

Sensitivity setting from

Low to High will cause the Noise Correction setting to

change from

On to Off. Conversely, if the Noise Correction setting is changed from

Off to On, the Sensitivity setting is changed from High to Low.

Setting Noise Correction

You can turn the Noise Correction function On or Off. When set to On, noise

correction will be activated and correct for the noise generated internally by the

analyzer. It allows the you to make accurate measurements on signals close to the

noise floor.

To Set the Measurement Noise Correction:

Step Notes

1. [Setup]

2. [Sensitivity]

Low or High

Step Notes

1 [Setup]

2 On [Noise Correction]

select

On or Off.

Each time you press this softkey, the selected

option changes.