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8600 Operation Manual - V1.0
AC / DC Coupling
The AC / DC coupling setting enables the removal of the signals DC content (in AC Coupling
mode).
AC Coupling helps to measure high frequency measurements by filtering any DC components
and removing them from the measurement.
Note : Low frequency signals may be filtered if AC coupling is enabled. It is recommended
that the DC Coupled mode is used in conjunction with the High Frequency filter when measuring low
frequency signals.
To switch between AC and DC coupled modes, press the AC/DC COUPLED key. The current
state is displayed in the status display as AC for AC coupled, and DC for DC coupled.
Low Frequency Measurement
Pressing the LF Range key will set the unit to
Low Frequency Measurement Mode
. In this
mode the instrument measures the frequency of the signal connected to the LF Measure Input. The
maximum input frequency is 10 MHz, and the maximum input is 20 V. The input impedance of this
input is 1 Mohm with a capacitive loading of 25pF
In this mode the Main Display will indicate the current measurement, followed by either “Int”
or “GPS”. A display of “GPS” indicates that the unit is currently disciplined to GPS, a display of “Int”
means that a fix has not been achieved. The smaller status display shows the Gate setting, Trigger
level, Sensitivity, HF Filter state and the current coupling mode.
To set measurement parameters, refer to the previous sections which detail each setting.
