B&K Precision 4010A - Manual - Manual (Page 11)

OPERATING INSTRUCTIONS
7. A superimposed DC component can be added to the output
signal by engaging the DC OFFSET switch (12) to enable
operation of the DC OFFSET control (5). Rotation of this
control adds a positive or negative DC component to the
output signal. The DC component introduced is
independent of the OUTPUT LEVEL control and can be
varied by ±10 volts open circuited or ±5 volts into 50 Ω.
The DC Offset does not affect the TTL/CMOS output
jack. The effect of DC OFFSET is shown in Fig. 3.
CONSIDERATIONS
l. Counterclockwise rotation of the FREQUENCY control
decreases the output frequency to approximately one-tenth
of the maximum for the range selected (10:1). For
example, if the 20K range is selected and the
FREQUENCY control is set to full counterclockwise (dial
setting of .2), the output frequency is approximately 2 kHz.
2. Clockwise rotation of the FREQUENCY control increases
the output frequency. At the fully clockwise setting (dial
setting of 2.0), the output frequency will be equal to the
RANGE selection. That is, when the 20K range is selected
and the dial is set to 2.0, the output will be 20 kHz.
3. When the dial is set to 1.0, the output frequency is one half
of the maximum for the range selected. When the 20K
range is selected and the dial is set to 1.0, the output will
be 10 kHz.
4. A more precise frequency setting may be achieved by
connecting an external frequency counter to the TTL or
output jack.
5. When outputting square waves or when using the TTL
output, terminate the cable into 50 Ω to minimize ringing.
Also, keep cables as short as possible.
Figure 3. Use of DC OFFSET Control
6. Remember that the output signal swing of the generator
is limited to ±10 volts open circuited or ±5 volts into 50
Ω, and applies to the combined peak-to-peak signal and
DC offset. Clipping occurs slightly above these levels.
Fig. 3 illustrates the various operating conditions
encountered when using the DC offset. If the desired
output signal is large or if a large DC offset is required,
an oscilloscope should be used to make sure that the
desired signal is obtained without undesirable clipping.
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