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Preparation
a) Initial settings
- Check the contacts of the BNC sockets for damage and short circuits
- Set the display switch to the position F/G. The switch is located at
the bottom right of the function generator
- Set the function switch to sine function
- Set the frequency selection switch "FREQUENCY" to 1 kHz
- Set the frequency adjustment control knob (scale) to the position
1.0
- Press all buttons such as AMP, OFFSET, SYM, SWEEP (WIDTH and
RATE), until they are latched in
- Set the output impedance to the required value (50 or 600 Ohm)
- If frequency is to be measured, note subclause c) of the function
generator instructions.
b) Output waveforms
The generator can deliver three standard basic waveforms: SINE,
SQUARE and SAWTOOTH. For these, press one of the switches under
FUNCTION.
: Sine waveform
: Square waveform
: Sawtooth waveform
c) Frequency range
Press one of the seven buttons under FREQUENCY, to set the desired
frequency range. The selectable ranges are given in the following
table:
Switch position
Frequency range
x 10
approx. 1 Hz to 10 Hz
x 100
approx. 10 Hz (2 Hz) to 100 Hz
x 1k
approx. 100 Hz (10 Hz) to 1 kHz
x 10k
approx. 1 kHz (100 Hz) to 10 kHz
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x 100k
approx. 10 kHz (1 kHz) to 100 kHz
x 1M
approx. 100 kHz (10 kHz) to 1 MHz
x 10M
approx. 1 MHz (110 kHz) to 10 MHz
Note!
The values in brackets are achieved when the frequency adjustment
control knob is almost at its left stop. They are dependent on the out-
put amplitude and the load connected to the generator output.
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- Set the Hi/Lo switch on the frequency counter to Lo and the gate time
to 1 sec. (lower LED row, centre LED).
- Set the display switch (bottom right on the FG) to F/G, in case not yet
done.
- The generator frequency can now be read in the LED display.
d) Voltage controlled Frequency VCF
- The output frequency of the generator can be adjusted by connec-
ting an external voltage to the VCF input (BNC).
- The output frequency can be adjusted by a factor of 1:20 by an
input voltage between 0 and 10 VDC, dependent on the setting of
the frequency range button.
- To be able to work with the VCF function, it is necessary to place the
frequency adjustment control knob (scale) to its left stop (two gra-
duations next to "0.1" on the right) and to connect the external DC
voltage to the VCF socket (BNC) (observing the inner "+" polarity).
e) Setting the output amplitude
- The amplitude of the output voltage with open output is 20 V p-p.
With 50 Ohm or 600 Ohm load the output voltage approximately
halves, i.e. to 10 V p-p.
- The amplitude of the output voltage is set with the AMP control
knob.
- By pulling this control knob the amplitude is set to -20 dB.
- To guarantee a precise waveform in the range from 1 MHz to
2 MHz, set the "AMP" control knob to 5 V p-p.
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