Skip to main content
Electronic Theatre Controls Inc

AC Voltage on 0-10v Lines


0-10v Analog dimming uses DC voltage.  ETC Fluorescent Option Cards and 0-10v Gateways should be used with isolated 0-10v drivers to reduce the risk of damage.  This means little or no AC voltage should be present on the 0-10v lines.  While some small amounts of AC voltage can be handled, more than a few volts can cause damage to the option card or gateway electronics. 

.  Damage caused to ETC product by mains voltage leaks on 0-10V control lines is not covered under warranty.

Checking for AC Voltage

In order to check your lines for AC voltage, first they must be removed from the 0-10v card or gateway.  Disconnect these lines but leave the fixture drivers powered.  Using a True RMS Multimeter, test for AC voltage on positive (typically violet) and negative (typically grey, although effective 1/1/2022 typically pink).  Next, meter each side to ground.  Over 15vAC is acceptable though less than ideal.  20vAC and higher will cause damage to electronics.

Do not work inside of a live rack!  When testing please make sure rack is closed and 0-10v wiring has been removed from the enclosure.

Testing procedure:

1. Before connecting the control wiring to the control card, energize the circuit.

2. Measure AC and DC voltage on the control wires from pole to pole and each pole to ground. If any measurement exceeds 20V additional voltage isolation is required or there may be a problem driver on the line. Do not connect wiring to the control card until this condition is resolved.

3. Observe that all fixtures are full bright when control wires are open and that when shorted all fixtures on the circuit go to their minimum level. If some or all fixtures do not dim, there is a problem with drivers or field wiring. The controller cannot address this kind of problem.

4. If all of the above tests pass, turn off the circuit and connect the wires to the control card.

Here is a handy excel file for recording Voltage. 0-10 Measurements.xlsx

Same Document but PDF. 0-10 Measurements.pdf



  • Filters can be installed on the 0-10v lines to filter out the AC voltage.  One filter would be needed per line.  The ETC part number for these filters is SGE1508. 
  • This filter is manufactured by EATON and is EATON model number RFI-010v-1 LC, part number 12512441. 
    • NOTE: Eaton RFI-010V-1  Have been discontinued as of 11/2021  A possible equivalent is the nLight nFLT2
  • Filters must be installed outside of the rack enclosure when used with Fluorescent Option cards as they are not rated for the amount of heat generated by a dimming rack.


  • Was this article helpful?