17
1) Procedure
(1) Set the unit´s function generator for the following conditions. ([Figure
7]
④
,
⑤
)
▪
DC OFFSET
: 0
▪
ATTENUATOR : 0dB
▪
SYM (Symmetry)
: 50.0
▪
SWEEP
: OFF
(2) Set the generator to the desired frequency
(3) Select the appropriate waveform (triangle, sine or square wave)
(4) Connect the 50
Ω
cable from the
FUNT OUT
terminal of the function
generator to the device under test.
(5) Adjust the AMP (Amplitude) to desired value
(6) Apply the appropriate DC offset voltage (+) or (-) to the output signal
by adjusting the OFS control
(7) If the TTL out put is to be used, it is a square wave with a fixed
amplitude level not affected by the Amplitude, Attenuator and DC
Offset controls.
[
Figure 8
] shows the phase relation of each output waveform.
[Figure 8] Output waveform and phase relation
2) Reference (supplementary explanation)
The following material is basic to the operation of this equipment and should be remembered when
using this instrument.
(1) The output is limited to ±10V no load or ±5V into a 50
Ω
load. When the OFS (DC OFFSET) is
added to the output waveform, limiting will occur when the amount of OFS Volts + output
amplitude is greater than ±10V (no load) or (±5V into a 50
Ω
load). [
Figure 9
] demonstrates this
effect.
(2) The output Impedance of the generator is 50
Ω
and can be connected to many different types of
equipment. When you are connecting a device having an input impedance of other than 50
Ω
,
the output level will be in some proportion depending on the input impedance of the device
under test. If the input impedance of the device under test is greater than 500
Ω
place a 50
Ω
load across the input terminals of the device under test.
