142 Chapter 2
Front-Panel Key Reference
Meas Setup
Exp Each successive data acquisition after the average
count is reached is exponentially weighted and
combined with the existing average. Exponential
averaging weights new data more than old data, which
facilitates tracking of slow-changing signals.
Repeat After reaching the average count, all previous result
data is cleared and the average count is set back to 1.
Key Access:
Meas Setup
TOI Span
Press TOI Span to specify the frequency span in which intermodulation
products are measured. The preset value (when
Preset Type is set to
Factory) is 15 MHz, or as defined in the following table by the radio
standard selected.
Key Access:
Meas Setup
Max Mixer Lvl
Allows you to change the maximum input mixer level from 10 dBm to
–100 dBm in 10 dB steps using the step keys, and in 1 dB steps using
the knob. In addition, you may use the keypad to specify a value. The
mixer level is equal to the reference level minus the attenuator setting.
As the reference level changes, the input attenuator setting is changed
to keep the power levels of on-screen signals less than the selected level
at the input mixer. Performing a
Factory Preset resets the maximum
input mixer level to –10 dBm.
Key Access:
Meas Setup
Optimize
Ref Level
Sets the reference level and attenuator to optimum values based on the
signal present at the input.
Key Access:
Meas Setup
Radio Standard Device Span VBW RBW
None N/A 15 MHz 100 kHz 100 kHz
IS95 BTS/MS 10 MHz 100 kHz 100 kHz
cdma2000 SR1 BTS/MS 10 MHz 100 kHz 100 kHz
cdma2000 SR3 BTS/MS 30 MHz 300 kHz 300 kHz
W-CDMA 3GPP BTS/MS 30 MHz 300 kHz 300 kHz
NADC BTS/MS 400 kHz 3 kHz 3 kHz
PDC BTS/MS 250 kHz 3 kHz 3 kHz
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