13
OPERATING INSTRUCTIONS
2.
Set the starting frequency with the
COARSE
control.
Apply a positive DC voltage to the
VCG/SWEEP
input
jack (9) to decrease the frequency. A voltage from 0 to
+10V will cause the frequency to decrease by a factor of
100 if the
COARSE
frequency control is set at maximum
CW rotation. For example, if the starting frequency is
100kHz, ap10V will change the output frequency
to 1kHz.
3.
To operate the function generator as a sweep generator,
apply a positive going ramp signal to the
VCG/SWEEP
input jack. As the ramp voltage increases, the frequency
decreases. The rate of sweep can be adjusted by varying
the frequency of the ramp signal.
4.
Specific frequencies can be selected by applying a fixed
dc voltage to the
VCG/SWEEP
input jack or the
frequencies can be stepped by applying a stepped dc
voltage.
5.
Do not apply more than ±15 volts (AC or DC + AC peak)
to the
VCG/SWEEP
input jack. Inputs of more than 15
volts will not cause any further shift in the frequency and
could cause damage to the generator.
OUTPUT PROTECTION CONSIDERATIONS
Use care when connecting the function generator output to a
signal injection point. Excessive voltage at the point of signal
injection of the function generator can cause internal damage.
Under normal operation, the generator output should never be
connected to an external voltage other than low dc values that
can be matched with the
DC OFFSET
control. The Model
4017A is overload protected so that shorting the output, even
continuously, will not cause damage. A fuse has been added in
series with the
OUTPUT
jack to help protect the instrument from
Damage of this type usually occurs by accidentally
connecting the output of the function generator to a voltage
in the equipment under test. The following protective
measures are strongly recommended:
1.
The user should understand the equipment under test
well enough to identify valid signal injection points
(i.e.: the base of a transistor, a logic input of a gate, etc.).
The voltage at valid signal injection points is rarely high
enough to damage the instrument.
2.
If in doubt about the safety of a signal injection point,
measure the voltage present at the intended point of
signal injection before connecting the function
generator output to that point.
3.
When applying the main output of the function
generator to a circuit point containing a dc level, adjust
the
DC OFFSET
control so that the dc level at the main
output matches the circuit voltage.
4.
Connect the
TTL
output only to TTL-level circuits.
Connect the
CMOS
output only to CMOS circuits.
Measure the Vcc of the circuit under test and adjust the
CMOS LEVEL
control as instructed in the manual.
5.
When the function generator is used by students or other
inexperienced users, the circuit of Fig. 5 could be added
into your TTL output probe or test clip set. It will
protect the TTL output of the generator against external
voltages up to ±20 volts.
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