Keysight E4980A User Manual page 94

Configuring Measurement Conditions (Display and Function Related Settings)
MEAS SETUP page
Figure 4-3 Feedback Circuit
Figure 4-4
the charts, solid lines denote the ranges that apply when the DUT is a resistor,
while broken lines denote the ranges for a capacitor or inductor.
When test signal level is set close to 2 Vrms/20 mArms or 20 Vrms/100
mArms or less then 5 mVrms, the warning message "ALC unable to
regulate" may appear.
94
shows the working ranges of the automatic level control feature. In
Keysight E4980A/AL Precision LCR Meter