16
When the generator output is connected to a coaxial connector on the
equipment under test, it usually moderate to high impedance. A reasonably
constant terminating impedance may be maintained while injecting signal into
moderate and high impedance circuits(500
:
and up)by adding a coaxial tee
in the output cable and connecting a 50
:
termination to one leg. Remove the
50
:
termination when injecting into a 50
:
circuit. Also keep DC injection point,
the DC offset should be set to match the circuit voltage, or blocking capacitor
may be required to avoid DC loading with 50
:
.
E. When using the higher output frequencies and when using the square wave
output, terminate the cable in 50
:
to minimize ringing. Keep the cables as
short as possible.
F. To set output amplitude to a specific level, measure peak to peak amplitude on
an oscilloscope.
3-4. Use As Pulse Generator
In a symmetrical square wave, sine wave, or triangle wave, the positive and
negative transitions are of equal time duration, or 1:1 ratio. This is the condition
when the SYMMETRY control off. When the SYMMETRY control is pulled and
rotated, the positive transition can be stretched in relation to the negative transition,
up to at least, 10:1 ratio. Square waves can be stretched into rectangular waves or
pulses, triangle waves can be stretched into distorted wave shape called a skewed
sine wave. FIG 5. illustrates the types of waveforms possible and includes a
summary of control settings used to obtain the desired waveform.
1)Procedure
A. Setup generator as described for function generator operation. Display the
output of generator on an oscilloscope.
B. Select the desired type of waveform with the Function Switches. Press the
square wave button for pulses, triangle button for ramp waves or sine wave
button for skewed sine waves.
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