B&K 4071 user manual DTMF Duration, DTMF Delay, Level, Offset, Ext Gating Input

Several keys on the front panel are used to generate DTMF digits other than “0” to “9”. They are listed here: To generate the "#" DTMF digit, press the minus (-) key.

To generate the "∗" DTMF digit, press the period (.) key. To generate the "A" DTMF digit, press the é key.

To generate the "B" DTMF digit, press the ê key. To generate the "C" DTMF digit, press the è key. To generate the "D" DTMF digit, press the ç key.

2. DTMF Duration

The DTMF tone will remain on for the time specified in this field. You may enter a value from 1 mS to 10,000 mS (10 seconds) in 1 mS steps.

3. DTMF Delay

The 4071 will delay generation of the DTMF tone by the time specified in this field. This parameter is used primarily to add an inter-digit delay between dialed digits so that the user can send a string of ASCII digits to the RS-232 port for speed dialing. The 4071 will insert the specified delay between the dialed digits. You may enter a value from 0 mS to 10,000 mS (10 seconds) in 1 mS steps.

4. Level

In this field enter the output level, from 4 mVp -p to 5 Vp -p in 1 mV steps or from -44.0 dBm to +18.0 dBm in 0.1 dBm steps.

NOTE: The level specified is a 50O loaded level. This is the level of the signal, which will appear across a 50O load connected to the SIG Out connector. Into an open circuit, the output swing will be twice the value entered.

Offset

You can enter an offset voltage for the output signal. For more information on output offsets refer to section 4.4.

Ext Gating Input

This TTL compatible input can be used to gate the output signal on or off. A logic high voltage turns off the output. For further information on the Ext Gating Input, refer to section 2.0.

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BK Precision 4071 User Manual Rev.2.2