Programmable AC Source 61605 User’s Manual
3-16
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’s
not necessary if doesn’t care ripple noise.
3. C and SW: It could switch off if UUT part already has capacitor.
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 for 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. Key in "OFF= 360" became " OFF= IMMED".
3.7.3 Slew Rate of Output Transient
The AC source can control the transition waveform of the output by setting COUPLE on
OUTPUT functional list (see 3.7). User can set three commands to achieve the transient
state of output waveform: Vs (V/ms), Fs (Hz/ms), DCs (V/ms).
Vs : the slew rate of output Vac.
Fs : the slew rate of output frequency.
DCs : the slew rate of output Vdc.
When user run OUT of AC source or change the output setting in MAIN PAGE, the output
voltage and frequency will change corresponding to the Vs, Fs, DCs commands.
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