ST 500 "Piranha" Operation Manual: Wired Receiver Channel
34
Key
Action
F3
activating the DIFFERENTIAL mode
F4
activating/deactivating the attenuator (20 dB)
ENTER
turning on "FIXED-FREQUENCY ANALYSIS" function
ESC, MODE
switching to the main menu of device
F1, FUNC
disabled
6.4. DIFFERENTIAL MODE
The DIFFERENTIAL mode is used to reduce the influence of external interference on the
information signals, and evaluate changes in the activity within a band upon connecting new
technical appliances to the circuit.
When the DIFFERENTIAL mode is activated, signal levels previously registered over the
previous scanning cycles, are set as "0". After that only signal levels in excess of "0" will be
displayed.
The DIFFERENTIAL mode is activated from "PANORAMA" by pressing "F3" (the key field will
become lighter). The screen will look as shown in fig.31.
To deactivate the DIFFERENTIAL mode (return to "PANORAMA"), press "F3" (the key field will
become darker). Attenuator and passband settings are saved.
Functionality:
analyzing the signal at a set frequency
search for signals in the AUTOMATED mode
activating/deactivating the attenuator (20 dB)
adjusting the band limits (zoom)
Fig.31
In fig.31:
1 - active detection channel
2 - differential spectrum of pulse signals obtained in the latest measurement cycle (yellow)
3 - differential spectrum of steady signals obtained in the latest measurement cycle (lilac)
4 - differential spectrum obtained over all previous measurement cycles (maroon)
5 - highlighting that indicates that the DIFFERENTIAL mode is on