B&K 4070A Manual Do Utilizador
BK Precision 4070A User Manual Rev.2.2
35
Ext Gating Input
This TTL compatible input can be used to gate the output signal on or off. Logic high voltage turns off the output.
For further information on the Ext Gating Input, refer to section 2.0.
For further information on the Ext Gating Input, refer to section 2.0.
Dualtone Examples
The following table lists the parameters for some common Dualtone.
Name
Name
Frequency 1
Frequency 2
On Time (Ton)
Off Time (Toff)
Dial Tone
350 Hz
440 Hz
1 mS
0 mS
Ring back
440 Hz
480 Hz
2,000 mS
4,000 mS
Busy
480 Hz
620 Hz
500 mS
500 mS
Reorder
480 Hz
620 Hz
250 mS
250 mS
DSN Preempt
440 Hz
620 Hz
1 mS
0 mS
European
420 Hz
440 Hz
various
various
Note: The Phase Offset field value may be set to any value to properly generate these tones.