Hello Miguel,

Did you control system volume or volume from some PC sofwares? For example, extra media  player.

To find solution  quickly, would you like to show us your operation by video? You can share video link here or send attachment to service@droking.com

Best regards.

Hello TheTrainRev,

Below is from our instruction:

Relay enable/disable function:In the running interface, short pressing STOP key can enable or disable relay.
“ON” means that when meets the conduction condition, the function of the relay will be enabled;
“OFF” means that even when meets the conduction condition, the function of the relay will NOT be enabled.
In the “OFF” state, the system will flash “OUT”.

Running interface means it is running instead of setting interface. You just need to press STOP only.

Please kindly notice if you disable relay function, it will always flash “OUT”.

Best regards.

Hello  Paul Curtis,

We just stop selling it online, but factory can produce it as needed.  Please feel free to send order  requirement to service@droking.com.

Best regards.

Hello Jake，

Please check if it is this item,  https://www.amazon.com/dp/B074FR4B7H/ref=as_li_tl?tag=proeng-20

Did you check it was shutoff or the sound is too weak in that case? Is it normal when you turn up phone volume?

If possible, would you like to show us how it is by video?

Best regards.

Hello John Wilshusen，

For large measurement range, it is hard to reach 0.1v or 0.1A resolution.

Do you need 500V or 200A range? If range can be smaller, there may be some items meet your requirement.

Best regards.

Hello Ed，

Is your problem for 200150?

Do you mean actual output is over the preset value? May I know more details about setting? For example, preset voltage and current, actual output current and voltage.

After turn off output, is there current flow out?  As long as current is zero, that means outpout is off.

Best regtards.

Hello  JC MCGUIRK,

If it is hard to upload picture here, would you like to send it to service@droking.com?

Best regards.