B&K Precision 4040A - Manual User Manual
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CONTROLS AND INDICATORS
FRONT PANEL (Refer to Fig. 1)
1. POWER Switch. Turns power on and off.
2. DUTY CYCLE Switch. When engaged, enables
operation of DUTY CYCLE control (7).
3. CMOS LEVEL Switch. When engaged, changes the
TTL signal to CMOS signal at the TTL/CMOS
jack, and enables operation of CMOS LEVEL
Control (8).
4. DC OFFSET Switch. When engaged, enables
operation of the DC OFFSET control (11).
5. -20dB Switch. When engaged, the signal at the
OUTPUT jack is attenuated by 20dB.
6. RANGE Switch. Selects output frequency range.
Eight ranges from 2Hz to 20MHz. Switch indicates
maximum frequency of range and is adjusted with
COARSE FREQUENCY control to 0.1 times the
maximum. For example, if the 200 kHz range is
selected, the output frequency can be adjusted
from 20kHz to 200kHz.
7. DUTY CYCLE Control. Activated by the DUTY
CYCLE Switch (2). Rotation from center position
adjusts the duty cycle of the main OUTPUT signal
and TTL/CMOS signal.
8. CMOS LEVEL Control. Rotating this control
clockwise increases the amplitude of the CMOS
signal at the TTL/CMOS jack.
9. FUNCTION Switch. Selects sine, square, or triangle
waveform at OUTPUT jack.
10. OUTPUT LEVEL Control. Controls the amplitude of
the signal at the OUTPUT jack. Output level can be
decreased by approximately 20dB with this control.
11. DC OFFSET Control. Activated by the DC OFFSET
Switch (4). Clockwise rotation from center changes
the DC offset in a positive direction while
counterclockwise rotation from center changes the DC
offset in a negative direction.
12. VCG/MOD
INPUT
Jack.
Controlled
by
MODULATION
OFF/ON
Switch
(33).
When
MODULATION OFF is selected, jack is the Voltage
Controlled Generator input and permits external
control of generator output frequency by a DC voltage
input at this jack. A positive voltage will decrease
frequency. When MODULATION ON is selected, jack
becomes modulation input source.
13. OUTPUT Jack. Waveform selected by FUNCTION
Switch as well as the superimposed DC OFFSET
voltage is available at this jack.
14. BURST INPUT Jack. Input for external gating signal
for Burst operation.
15. TTL/CMOS Jack. TTL or CMOS square wave,
depending on the position of the CMOS LEVEL
switch (3) is output at this jack. This output is
independent of the OUTPUT LEVEL and DC OFFSET
controls.
16. EXT. COUNTER INPUT Jack. Input for external
frequency measurements.