Specifications

Chapter 3 27
Measuring a Low−Level Signal
Reducing Input Attenuation
Measuring a Low
−
Level Signal
Step 6. Set the attenuation to 20 dB:
Press
AMPLITUDE Y Scale, Attenuation, 20, dB.
Note that increasing the attenuation moves the noise floor closer to the
signal level.
A “#” mark appears next to the Atten annotation at the top of the
display, indicating that the attenuation is no longer coupled to other
analyzer settings.
Step 7. To see the signal more clearly, set the attenuation to 0 dB:
Press
AMPLITUDE, Attenuation, 0, dB.
See Figure 3-2 shows 0 dB input attenuation.
Figure 3-2 Measuring a Low-Level Signal Using 0 dB Attenuation (ESA)
CAUTION When you finish this example, increase the attenuation to protect the
analyzer’s RF input:
Press AMPLITUDE Y Scale, Attenuation (Auto) or press Auto Couple.
NOTE All figures in this chapter are screen captures from an ESA. Display
and numerical results may be different for a PSA.