B&K 4070A - Manual (Page 39)

BK Precision 4070A User Manual Rev.2.2
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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 o n 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:
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 10 Vp -p in 1 mV steps or from -44.0 dBm to +21.0 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.
Dualtone F1: 10,000 Hz F2: 5,000 Hz Ø: 0
Ton: 1,000 mS Toff: 0 mS -10.0 dBm
4 5 6
1 2 3