B&K Precision 4052-4055 - Manual - Manual (Page 63)

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Coupling
The counter can be set to AC or DC coupling. Select Mode from the menu and toggle the
corresponding menu function key to change between DC or AC for DC and AC coupling
respectively.
HFR
A high frequency reject filter can be enabled or disabled. Enabling this filter may help
improve the frequency measurements of certain signals. From the menu, select HFR and
toggle the corresponding menu function key to turn it On or Off.
Default Settings
All of the counter settings can be configured to default values by selecting Default from the
menu. Below is a table of the default settings.
Counter Parameters Default Settings
Reference Frequency (RefeFreq) 10.000000 MHz
Trigger Level (TrigLev) 0.0 V
Coupling (Mode) AC
High Frequency Reject Filter (HFR) Off
Select Done to return to the counter main menu.
3.9 System Configurations
The second page of the utility menu contains system parameters that can be adjusted.