B&K 4071 user manual Dualtone Generation Mode, 10,000 Hz F2 Ton 000 mS Toff 10.0

5.24 Dualtone Generation Mode

Introduction

The Dualtone Generation mode generates an output signal, which is the sum of two sinusoids of equal amplitude. The frequency of each sinusoid may be individually specified with 1 Hz resolution. In addition, a phase offset may be specified which offsets the phase of one sinusoid with respect to the other. The resulting Dualtone waveform may be gated on and off for specified intervals. This feature allows the user to pulsate the tone, which can be especially useful when generating cadenced signals such as a busy tone, ring-back, etc.

This mode is available under the “other” modes menu. To enter the Dualtone Generation mode, press:

Mode, Clear, 2

Dualtone Generation Mode Parameters

The Dualtone Generation mode has the following front panel display:

1 2 3

Dualtone F1: 10,000 Hz F2: 5,000 Hz Ø:

0

Ton:

1,000 mS Toff:

0 mS -10.0 dBm

4 5 6

Figure 5.24-1: Dualtone Generation mode display

1. Tone 1 frequency

In this field enter the frequency of the first signal. You may enter from 0 Hz (DC) to 10.000 KHz in 1 Hz steps.

2. Tone 2 frequency

In this field enter the frequency of the second signal. You may enter from 0 Hz (DC) to 10.000 KHz in 1 Hz steps.

3. Phase Offset

In this field enter the phase offset from the first sinusoid to the second. The sinusoid of Tone 1 is advanced by the specified phase relative to Tone 2. This parameter is useful when the frequencies of the two tones are harmonically related and a specific phase relationship between the two is desired. You may enter from 0 degrees to 359 degrees in 1 degree steps.

4. Output “On” time

In this field enter the amount of time for the output to remain on. If you wish a continuous output, any value may be specified here, but you will need to set the “off” time to 0 mS. You may enter an ON time from 1 mS to 10.000 Sec in 1 mS steps.

5. Output “Off” time

In this field enter the amount of time for the output to remain off. If you wish a continuous output, set this value to

0 mS. you may enter an OFF time from 0 mS to 10.000 Sec in 1 mS steps.

6. 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.

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BK Precision 4071 User Manual Rev.2.2