To Select Input Coupling And Impedance; Selecting Input Coupling - HP 53131A Operating Manual

Chapter 1 Getting Started
Making Measurements
Again, the Counter will automatically display the measured frequency of
the input signal.
If you need or want to change CHANNEL 2's coupling, impedance, and
triggering conditions to match the input signal you are trying to measure,
the next procedures "To Select Input Coupling and Impedance" and
"To Set Input Channel Trigger Level/Sensitivity" demonstrate this.
Perform these procedures whether or not you want to customize the
Counter's input conditions to measure your signal; doing this will help you
become familiar with the DC/AC, 50 /1M , and Trigger/Sensitivity
keys.

To Select Input Coupling and Impedance

Remember, the input signal is still connected to CHANNEL 2.

Selecting Input Coupling

CHANNEL 2
Trigger
Sensitivity
50
1M
!
DC
Damage Lvl:
AC
Channel 2's input coupling is now set to dc.
5V rms MAX. 50
X10 100kHz
Filter
Attenuate
If you want to change the coupling back to the default ac coupling, perform
the following step.
Operating Guide
DC
AC
DC
AC
Display 1 7/13/92
1-15