USB 6003 and thorlabs scanning galvo system

[minjcha]

Hi all, 

I purchased the USB 6003 DAQ card for operating thorlabs' scanning glavo (GVS012). 

But, when I apply the analog output voltage signals to the driver board, it doesn't work, the current was zero on the power supply. 

I was wondering if the DAQ card is proper to operate the system. The required spec is as follows. 

- Dual bipolar -10 to10V DAC analog output channel(differential),
- DAC clocking frequency higher than 20kS/S, higher sampling frequencies like 100kS/s are recommended. 

Thanks in advance,

[RavensFan]

Compare it to the specs!

The USB-6003 is only capable of 5000 samples/second per channel.  And is not differential analog output.

[GerdW]

Hi minjcha,

But, when I apply the analog output voltage signals to the driver board, it doesn't work,

Does the USB-6003 output the expected voltage on its AO pins? Did you verify using a DMM?

I was wondering if the DAQ card is proper to operate the system. The required spec is as follows.

- Dual bipolar -10 to10V DAC analog output channel(differential),
- DAC clocking frequency higher than 20kS/S, higher sampling frequencies like 100kS/s are recommended.

The USB-6003 can output ±10V on its both AO channels.

It only offers 5kHz samplerate, simultanously: why do you think you need more than this?

Even though ThorLabs asks for "differential analog input" it shows schematics with -Input connected to Ground pins (see page 14 of the manual!), so the output of the USB-6003 should be ok.

I guess you also wired the ExternalEnable input of your device?

[minjcha]

Hi GerdW,

Does the USB-6003 output the expected voltage on its AO pins? Did you verify using a DMM?

--> Yes, I connected AO pins to the servo driver board. Also, I connected my - input to AO Ground. 

But, What is the External Enable input? Should I connect this to my DAQ? 

Thanks,

[GerdW · Accepted solution]

Hi minjcha,

Yes, I connected AO pins to the servo driver board. Also, I connected my - input to AO Ground.

And did you verify the correct voltage using a DMM or similar?

But, What is the External Enable input? Should I connect this to my DAQ?

The ExternalEnable is (probably) explained in the manual to your servo driver. (Atleast it should…)

Most motor drivers I used so far need some "Enable" signal to actually power the motor. This is used as (simple) safety feature. Most often that Enable is a simple boolean signal…

[minjcha]

Hi GerdW, 

I have tested the voltage using DMM and it gives the correct voltage that I coded. Also, I enabled the driver board but didn't work.. 

Do you have any idea on how the analog voltage signal looks like? I am currently generating the analog output voltage like this (-10 to 10V, increment by 1 V, pausing 1sec in between). -10 V, pause 1sec, -9V, pause 1sec, -8V, pause 1sec,..........0V, pause 1sec,......... 10V pause 1sec. 

Thanks,

Minjeong

[GerdW]

Hi minjcha,

Also, I enabled the driver board but didn't work..

What does the manufacturer of your servo driver say about this problem?

Do you have any idea on how the analog voltage signal looks like?

How should I know? I don't have access to your setup…

Yu should know the answer from your own experiment: I expect some voltage steps as described by you!

[minjcha]

Thanks!

I was able to run the system. The problem was the power supply. 

Thank you for your help.