Programmable AC Source 61501/61502/61503/61504 User’s Manual
3-18
Illustration for fixture:
1. Bridge diode: Because of internal control circuit of AC source, if users connect more
than 20uF capacitor at output side, it may cause output unstable. It’s better to use
bridge diode for isolating external capacitor. Also, it could prevent from wrong
connection for polarity of output DC level. But, it will cause 1.6V drop when adds the
bridge diode. (The user can compensate the output DC voltage by setting voltage level.
For example, the user can program 11.6V in order to get 10 V on the output of fixture
board.)
2. L and high frequency capacitor: They can filter high frequency ripple and noise. But it
is not necessary if doesn’t care ripple noise.
3. C and SW: C is the capacitor with large capacity. It can be added if the UUT doesn’t
have it. However, it can be off by SW if the UUT already has one or does not care.
4. Discharger resistor and SW: It could discharge the capacitor for avoiding remnant
voltage to hit user when output off. But, users need to consider about power
consumption, the discharger resistor power should be enough for it.
3.7.2 OUTPUT DEGREE
The AC source can control the transition angle of the waveform when it out or quit. The
user set DEG ON and OFF to achieve it in OUTPUT functional list (see 3.7)
The procedures of setting output phase angle DEGREE ON = 90 and OFF = 180, are
described as below:
1. Move the cursor to the command line DEG: ON = 0.0_ OFF= IMMED
of “ON = ”.
2. Press
9 , 0 , then ENTER to change
the value to " 90.0". DEG: ON = 90.0 OFF= IMMED_
3. The cursor moves to the command line
of “OFF= ” automatically.
4. Press
1 , 8 , 0 , then press ENTER DEG: ON = 90.0 OFF= 180.0
to change the value to "180.0".
If "OFF=IMMED", the output voltage quits immediately when the user
presses
QUIT. But if a value of degree is set, the output voltage will last
until the setting degree. Keyin "OFF= 360" become "OFF= IMMED".
3.7.3 Programmable Output Impedance
The AC source’s output impedance is low as a good voltage source. But for some tests, the
user needs particular output impedance. The AC source can program the output
impedance in certain range by setting Prog Zo on OUTPUT functional list (see 3.7).
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