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122 Chapter 4
Optimizing Performance
Using External Leveling
Figure 4-3 Typical Diode Detector Response at 25° C
External Leveling with Option 1E1 Signal Generators
Signal generators with Option 1E1 contain a step attenuator prior to the RF output connector. During
external leveling, the signal generator automatically holds the present attenuator setting (to avoid
power transients that may occur during attenuator switching) as the RF amplitude is changed. A
balance must be maintained between the amount of attenuation and the optimum ALC level to
achieve the required RF output amplitude. For optimum accuracy and minimum noise, the ALC level
should be greater than −10 dBm.