ST 500 "Piranha" Operation Manual: Low Frequency Amplifier Channel
48
Important!
While setting the bias voltage, other functions will be inaccessible.
The bias voltage, once set, will remain unchanged until deactivation of the "LOW FREQUENCY
AMPLIFIER" channel (switching to the main menu of device).
If the voltage on the pair connected to the ST 500 is beyond ±3 V, the application of bias
voltage to these wires is disabled.
The measured voltage value will in this case be marked red (fig.45, 3). When this pair is
engaged (by selecting the corresponding table row) a red sign reading "OVER" will appear in the
upper-center part of the screen (fig.45, 2) and the "F3" key field will look as shown in fig.45, 4.
If the voltage (Vdc) in the connected pair exceeds ± 50 V, the inscription ">50" appears in the
corresponding cell.
Fig.45
In this case, to apply a bias voltage, de-energize the cable.
7.5. AUTOMATED MODE
The AUTOMATED mode is intended for cycling through all possible paired combinations of wires
in a multicore cable.
To activate this feature, press "F4" ("Scan all") (fig.40). The electronic switch will consecutively
engage all the pairs of wires, staying for several seconds at each of them (each time the
corresponding table row will become active).
The user can analyze the received signal by listening to the output sound.
If during scanning suspect signals have been detected, when the cycle is over they should be
analyzed by means of "OSCILLOSCOPE" and "SPECTRUM ANALYZER".
7.6. OSCILLOSCOPE
The OSCILLOSCOPE is activated from "ELECTRONIC SWITCH CONTROL" mode or the
AUTOMATED mode by pressing "F1".
Upon activation, the screen will look as shown in fig.46.
