User`s guide

30 53220A/53230A User’s Guide
1 Preparation for Use
Refer to “Reference Oscillator Configuration” in Chapter 3 for detailed infor-
mation on selecting and configuring the reference oscillator source.
Auto Level
The threshold level is the trigger (input) level at which the counter begins the
measurement. Auto-level is the automatic setting of this threshold based on
the positive and negative peaks of the input signal.
The minimum frequency at which auto-leveling can occur is set as shown.
Slow sets the minimum frequency for auto-leveling at 50 Hz. Fast sets the
minimum frequency for auto-leveling at 10 kHz.
Refer to “Threshold Level and Sensitivity” in Chapter 4 for additional
information on using auto-level.