Equipment Description 3-7
Revision 2 - 26 April, 2000 HP SERIES DIMMER TECHNICAL MANUAL
The opto-isolators' output drives the Load LEDs via 470R resistors from the 5 volt rail
at up to 6mA. Although the LED current is vaguely proportional to output voltage,
visually it is not linear due to LED and perceptual non-linearities.
3.5.3 Load Detecting
When no load is connected, the Load LED will light. The snubber and filter capacitors
(100nF for HP12-TR and HP6-C, 47nF for HP12-SC) will pass an ac current of 7mA to
22mA, which is sensed by the Load LED as an output voltage.
The Load LED may be used to indicate the presence of a load only when no drive is
present, and the channel’s breaker is on. In this case, NO LOAD = LED ON;
CHANNEL LOADED = LED OFF.
When the channel is driven (as indicated by the Drive LED) the Load LED will act
simply as an output mimic.
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