Local Operation
3-15
3.7.1 COUPLE Mode of Output (AC+DC, AC, DC)
There are three couple mode of AC source output: AC+DC, AC and DC. The user can set
COUPLE on OUTPUT functional list (see 3.7) to fit the application. Then, the display of
MAIN PAGE will change corresponding to the mode.
The procedures of setting from AC+DC to AC are shown as below:
1. Move the cursor to the command of "COUPLE=" COUPLE = AC+DC_
2. Turn RPG to change the option from AC+DC to AC, COUPLE = AC
then press ENTER.
The DC mode of AC source is applied to doing some voltage tests. The
AC source has not such many output capacitors; some features like
voltage ripple, load transient, are not as good as DC source. But it can
supply positive and negative DC voltage without changing output
Chroma 61600 AC source have AC/DC/AC+DC output function, at DC
output part, it’s still different from really DC source, the reason as below:
1. The big ripple noise at DC output, it is because of AC source have no
output capacitor.
2. The AC source output relay will switch off when the current over the
specification, it will cause output voltage interruption.
P.S. Normally the DC source will change to C.C. mode, then the
output voltage slow down to 0V.
3. Another major reason is, it cannot accept add/increase large
capacitor, more than 20uF at output side directly. It may cause
output unstable and damage AC source.
For solving above weak point, we suggest that adds a special fixture for sure and protection.
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