Premium Members Thomas English Posted August 1, 2011 Premium Members Report Share Posted August 1, 2011 I want to use the Digital Bartech (Heden 26VE) as the remote iris channel for the DoP. Make up a preston to preston short power cable with a little pigtail out to power the digital bartech. This way the bartech just velcroes onto the Preston wherever it is on the camera. Is there enough power out of a single 3Pin RS out on the Arri Alexa to do both the Preston (one motor) and a Digital Bartech ? Quote Link to comment Share on other sites More sharing options...
Premium Members JimBartell Posted August 1, 2011 Premium Members Report Share Posted August 1, 2011 The power requirement of the BDR w/M26VE is very low, particularly when used for Iris control. I suspect it would be less than 500 mA, so you should have no problem. Jim Bartell Quote Link to comment Share on other sites More sharing options...
Premium Members Marc Alfonso Posted August 5, 2011 Premium Members Report Share Posted August 5, 2011 Hi All Alex and I just ran some tests in the Lab to get numbers. fSTOP BDR with M26Ve Currents Just to refresh everyone: 1000 mA = 1 Amp 12V Calibrating - Moving 119.75 mA Calibrating - First stop 546.25 mA Calibrating - Second stop 540.75 mA Motor - not moving 74.76 mA Motor - moving 134.5 mA Motor - moving under load 758.13 mA Motor - stalled 1.38 A 24V Calibrating - Moving 91.18 mA Calibrating - First stop 481.79 mA Calibrating - Second stop 497.17 mA Motor - not moving 51.22 mA Motor - moving 164.88 mA Motor - moving under load 799.88 mA Motor - stalled 2.55 A Cheers, Marc Quote Link to comment Share on other sites More sharing options...
Premium Members Thomas English Posted August 6, 2011 Author Premium Members Report Share Posted August 6, 2011 Thanks guys. This is a great setup to have remote DoP iris on an MDR1/HU1. Hi All Alex and I just ran some tests in the Lab to get numbers. fSTOP BDR with M26Ve Currents Just to refresh everyone: 1000 mA = 1 Amp 12V Calibrating - Moving 119.75 mA Calibrating - First stop 546.25 mA Calibrating - Second stop 540.75 mA Motor - not moving 74.76 mA Motor - moving 134.5 mA Motor - moving under load 758.13 mA Motor - stalled 1.38 A 24V Calibrating - Moving 91.18 mA Calibrating - First stop 481.79 mA Calibrating - Second stop 497.17 mA Motor - not moving 51.22 mA Motor - moving 164.88 mA Motor - moving under load 799.88 mA Motor - stalled 2.55 A Cheers, Marc Quote Link to comment Share on other sites More sharing options...
Premium Members Kar Wai Ng Posted August 6, 2011 Premium Members Report Share Posted August 6, 2011 Do you have numbers for current draw for Preston motors with the BDR? Quote Link to comment Share on other sites More sharing options...
Premium Members Lawrence Karman Posted August 6, 2011 Premium Members Report Share Posted August 6, 2011 max current draw on the Alexa accessory connectors is 2.2A according to the manual Quote Link to comment Share on other sites More sharing options...
Premium Members Marc Alfonso Posted August 10, 2011 Premium Members Report Share Posted August 10, 2011 Do you have numbers for current draw for Preston motors with the BDR? I only have a Preston DM2 motor in the lab at the moment and will work on getting the data Quote Link to comment Share on other sites More sharing options...
Premium Members Marc Alfonso Posted August 10, 2011 Premium Members Report Share Posted August 10, 2011 Do you have numbers for current draw for Preston motors with the BDR? fSTOP BDR Currents with Preston DM2 motor 12V Calibrating - Moving 136.5 mA Calibrating - First stop 231.25 mA Calibrating - Second stop 279 mA Motor - not moving 74.88 mA Motor - moving 163.75 mA Motor - moving under load 624.75 mA Motor - stalled 1.29 A 24V Calibrating - Moving 102.75 mA Calibrating - First stop 222 mA Calibrating - Second stop 287.25 mA Motor - not moving 54.33 mA Motor - moving 230.5 mA Motor - moving under load 619.25 mA Motor - stalled 1.87 A Regards, Marc Quote Link to comment Share on other sites More sharing options...
Premium Members Thomas English Posted August 10, 2011 Author Premium Members Report Share Posted August 10, 2011 Looks good to me! Quote Link to comment Share on other sites More sharing options...
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