ATE-DMG 020613
3-3
NOTE: Load connections for application requiring solely stabilized output current are not as
critical as those requiring stabilized output voltage:
a. D-C wire drops do not influence the current stabilizing action, but must be sub-
tracted from the available compliance voltage.
b. Wire inductance is “swamped-out” by the action of the output capacity. Emphasis in
the following paragraphs is therefore placed on the power supply as a
voltage
source,
rather than a current source.
A more realistic model for a voltage stabilized power supply must, for example, include a series
resistance, representing the small d-c and low frequency source impedance, in series with an
inductance, representing the source impedance at higher frequencies. Load wire selection
should therefore proceed with those facts in mind. The load wire size should not only be
selected for minimum voltage drop (Error Sensing, as discussed below, will take care of that),
but also the series inductance of the load wire must be kept as small as possible compared to
the source inductance of the power supply (Error Sensing
cannot
compensate for this). These
dynamic considerations are especially important if:
1. The load is constantly changing in value.
2. The load is switched “on” and “off.”
3. The output of the power supply is step programmed.
4. The load has a primarily reactive characteristic.
5. All other cases where the dynamic output response of the power supply is considered impor-
tant.
3.2
LOAD CONNECTION
3.2.1
GENERAL
Kepco has provided a group of terminals on the programming connector PC-12 and on the bar-
rier strip (TB210) at the rear of the power supply, which permit maximum flexibility in power sup-
ply/load interface techniques. Although all applications tend to exhibit their own problems, the
basic interconnections described may be used as a general guide in the interconnection
between power supply and load.
The Kepco power supply is shipped from the factory with several jumper links (see Figure 3-2,
connected to the barrier strip (TB201). These links may be removed and replaced at will,
depending on the method of connecting the load. Positioned as shown in Figure 3-2, the links
are connected for local error sensing.
Links on the barrier strip must be tightened.
LOOSE
LINKS AT THE BARRIER STRIP WlLL CAUSE MALFUNCTION OF THE POWER SUPPLY.
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