ST300 SPIDER
20
2.5.2. Automatic Mode of the LF Amplifier
To optimize the testing procedure, an automatic routine is available in the “LFA
”
mode (the automated
“LFA
”
mode). This allows testing all the possible two-wire combinations in a multiwire cable without
exiting to the main screen of the “SWITCH
”
mode. The gain and bias voltage values for each pair will
remain as previously set in the main menu.
To go to the automatic mode from the main menu of “LFA
”
, press “MODE
”
.
The menu of the automated “LFA
”
mode is shown in Fig. 27.
To apply a bias voltage in such case, it will be necessary to disconnect the cable in question from the
power source.
Once set, the bias voltage value will remain the same until it is adjusted or the device is turned off.
2.5.1.4. Switching to Other Modes
“ESC
”
– exit from the “LFA” mode to the Start Menu.
“F1
”
– go to the “SWITCH” mode.
“FUNC
”
– go to the cable settings menu.
“MODE
”
– go to the automated “LFA” mode.
Fig.27
The numbers in Fig.27 represent:
1 – current mode
2 – selected wire pair
3 – wire pairs column
4 – constant voltages column
5 – alternating voltages column
6 – table cursor
7 – selected gain value
8 – selected bias voltage value
9 – hotkey assignment
Use the arrow keys to navigate the table.
When a pair of wires is selected by moving the table cursor to the corresponding table line, the
Electronic Switch will automatically connect this pair through to the Main Unit’s input. The Main Unit will
then measure the voltage on this pair of wires, and the result will be entered in the table. If a DC or AC
voltage measured on a pair exceeds 3V in absolute value, the bias voltage, if set, will not be applied to
the line.
The hotkey field (8, рис 23) will look in this case as follows:
The corresponding table entry will read,
>3V
.
To apply a bias voltage in such case, it will be necessary to disconnect the cable in question from the
power source. The gain and bias voltage are to be set as described in 2.5.1.2 and 2.5.1.3, respectively.
For automatic testing over all two-wire possible combinations in a multiwire cable, press “F4
”
(“Scan
All
”
). The device will be testing all the two-wire combinations consecutively, pausing at each pair for a
few seconds, so the user can analyze the sound output.