17
Step 3
Press the
SQUARE WAVE SELECT
button. The unit must output a symmetrical square wave type signal on the
OUTPUT
jack. As
an effect of pressing the button, the
SQUARE WAVE SELECT LED
lights and the
TRIANGLE WAVE SELECT LED
is not
lighted.
Step 4
Turn the
DUTY CYCLE
knob counter clock wise until the displayed duty cycle
reaches 40%. The LCD display should look like Figure 13. The output signal on
OUTPUT
jack should be asymmetric (an example of an asymmetric square wave is
given in section 3.2.5.3).
The
DUTY CYCLE LED
must be lighted.
Step 5
Press the –20dB button. This will engage the – 20dB attenuation on the main signal
path. The signal level must decrease with –20dB, the output level will reach a level
of 101mV
p-p
(on 50ohm load). The LCD display should look like Figure 14.
The –20dB LED must be lighted.
Step6
Turn the
OUTPUT
knob clock wise until the displayed output level reaches 500mV.
The LCD display should look like Figure 15.
Output level is now 500mV
p-p
(on 50ohm load).
Step 7
Turn the
DC OFFSET
knob clock wise until the displayed offset level r
2.100 V. The LCD display should look like Figure 16.
The
DC OFFSET LED
must be lighted.
There will be an asymmetric square wave signal of 500mV
p-p
(on 50ohm load), on
the
OUTPUT
jack positioned at +2.100 V
p-p
above the zero level.
8.0000MHz
10M
40% DutyCycle
FREQUENCY
RANGE (Hz)
LEVEL
Peak-to-Peak
(into 50
Ω
)
Figure 13: LCD example of displaying
duty cycle parameter
8
.0000MHz
10M
101mV Output
FREQUENCY
RANGE (Hz)
LEVEL
Peak-to-Peak
(into 50
Ω
)
Figure 14: LCD example of using
-20dB attenuation
8
.0000MHz
10M
500mV Output
FREQUENCY
RANGE (Hz)
LEVEL
Peak-to-Peak
(into 50
Ω
)
Figure 15: LCD example of using
-20dB attenuation
8
.0000MHz
10M
+ 2.100 V Offset
FREQUENCY
RANGE (Hz)
LEVEL
Peak-to-Peak
(into 50
Ω
)
Figure 16: LCD example of displaying
offset parameter
