Keysight 81160A - Page 137

Features and Functions
81150A and 81160A User’s Guide 137
FSK Threshold Voltage
Introduction
The Modulation-In Threshold defines the signal level at which the FSK will
shift to the hop frequency.
 If the signal levels are less than the Modulation-In Threshold, then
the output signal will have the Carrier Frequency
 If the signal levels are more than the Modulation-In Threshold, then
the output signal will have the Hop Frequency
 The allowed range is 5V for the 81150A (2.5V for the 81160A); and
is limited by Modulation-In Input Range.
Front Panel
Operation
After selecting the modulation function, press the Modulation Type softkey
to select FSK.
Then, press the MOD-IN softkey.
Press Threshold softkey. Select from TTL, ECL or Variable.