Hello,

I have searched high and low in the manual and FAQ without luck. The DT85 Series 2 has TWO power supply inputs for the switched excitation and shunt resistor. They are labeled exactly the same (EXT * and EXT #).

My question: Are these inputs tied together (is one EXT * electrically equivalent to the other)? Is one power input used for certain analog channels? If I am using switched excitation on all 16 analog channels, should I use TWO 24VDC power sources on these excitation terminals?

Thank you!
Natalie

Hi Natalie,

You can use only one external excitation (wired between Ext* and Ext#) to power up current sensor (up to 16 sensors).
By using external excitation, dataTaker will assume the use of internal shunt resistor as well.

dataTaker series 1 and 2 has a single voltage output 12V that can be use as excitation. The other excitation source is internal 4.5V specific for particular channels (bridge).
While series 3 has two voltage output (12V and 5V).

Best regards,
Rudy Gunawan

Rudy -

Does it matter which pins I use for excitation? They are labeled exactly the same (EXT *, EXT #). One is on the top line of inputs, at the end, and the other is immediately below it. Is there any difference between the two inputs?

Hi Natalie,

The power plus to the EXT* and ground to the Ext#

Cheers,
Roger