# Instrument with analog output, cheap and on RS232/USB

K

#### Klaus Kragelund

Jan 1, 1970
0
Hi

For a test setup I often need an analog signal to feed into the device under test.

So I need a instrument with an anlog output. It needs to run on RS232 or USB

I could roll my own, with a eval board, but have no time to spend on that

Anyone know of a cheap model (no the National Instruments, NIDaqs, they are prohibitive expensive)

Thanks

Klaus

R

#### Rich Webb

Jan 1, 1970
0
Hi

For a test setup I often need an analog signal to feed into the device under test.

So I need a instrument with an anlog output. It needs to run on RS232 or USB

I could roll my own, with a eval board, but have no time to spend on that

Anyone know of a cheap model (no the National Instruments, NIDaqs, they are prohibitive expensive)

Bandwidth? Memory depth? Resolution? Sync trigger?

This http://www.circuitspecialists.com/dds-3005usb.html might do the job
and it's fairly inexpensive.

M

#### Martin Riddle

Jan 1, 1970
0
Klaus Kragelund said:
Hi

For a test setup I often need an analog signal to feed into the device
under test.

So I need a instrument with an anlog output. It needs to run on RS232
or USB

I could roll my own, with a eval board, but have no time to spend on
that

Anyone know of a cheap model (no the National Instruments, NIDaqs,
they are prohibitive expensive)

Thanks

Klaus

Have you looked at Measurement Computing? They are inexpensive, less
than NI.
<http://www.mccdaq.com/solutions/USB-Data-Acquisition.aspx>

Cheers

R

#### rickman

Jan 1, 1970
0
Hi

For a test setup I often need an analog signal to feed into the device under test.

So I need a instrument with an anlog output. It needs to run on RS232 or USB

I could roll my own, with a eval board, but have no time to spend on that

Anyone know of a cheap model (no the National Instruments, NIDaqs, they are prohibitive expensive)

Thanks

Klaus

I assume a standard USB stereo audio adapter for the PC won't work?

Rick

N

#### Nico Coesel

Jan 1, 1970
0
Klaus Kragelund said:
Hi

For a test setup I often need an analog signal to feed into the device under test.

So I need a instrument with an anlog output. It needs to run on RS232 or USB

I could roll my own, with a eval board, but have no time to spend on that

Anyone know of a cheap model (no the National Instruments, NIDaqs, they are prohibitive expensive)

You can use a cheap PLC like this:
http://www.xlogic-plc.com/

or a programmable power supply like this:
http://www.ebay.com/itm/261050328132

K

#### Klaus Kragelund

Jan 1, 1970
0

Yes, just what I needed. Thanks

S

#### Spehro Pefhany

Jan 1, 1970
0
Be careful about the power supply - I did some hunting and found the
user manual - useless - not a word about programming.
I've had reasonable results from GW Instek PSP603, 60V 3.5A, documented
control via Rs232 (although it needs a 12V supply poked in on one of the
9 pin d connections for this to work).
Currently £159 from CPC in UK - cheapest programmable supply I could
find - build quality not bad at all but it's obviously not in Agilent
league (and nowhere near tradiitonal HP) for this money.

MK

I bought this 30V/5A one for USD $99 (£61) including shipping with (isolated) USB and RS-232 interfaces. Seems to be unavailable from that source atm. I think it's okay Chinese quality, but probably rated a bit "optimistically" according to DJ's vblog. No NA safety approvals. It's a kind of spare for when the 3-output Rigol is being used or maybe for risky types of loads. http://www.amazon.com/gp/product/B0085QLNFM/ref=oh_details_o03_s00_i00 Speaking of Rigol, if you want more like a signal, these units are a bargain, in a different class quality and design-wise. They have an Ethernet interface (inherently isolated), and two signal generators, so you can generate a 50MHz sine wave frequency modulated with a 1MHz triangle wave if that's what you want. http://www.rigolna.com/products/waveform-generators/dg4062/ They have higher frequency units, but the price goes up quickly for the additional capability. Best regards, Spehro Pefhany G #### George Herold Jan 1, 1970 0 I bought this 30V/5A one for USD$99 (£61) including shipping with
(isolated) USB and RS-232 interfaces. Seems to be unavailable from
that source atm. I think it's okay Chinese quality, but probably rated
a bit "optimistically" according to DJ's vblog. No NA safety
approvals. It's a kind of spare for when the 3-output Rigol is being
used or maybe for risky types of loads.

http://www.amazon.com/gp/product/B0085QLNFM/ref=oh_details_o03_s00_i00

Speaking of Rigol, if you want more like a signal, these units are a
bargain, in a different class quality and design-wise. They have an
Ethernet interface (inherently isolated), and two signal generators,
so you can generate a 50MHz sine wave frequency modulated with a 1MHz
triangle wave if that's what you want.

http://www.rigolna.com/products/waveform-generators/dg4062/

They have higher frequency units, but the price goes up quickly for

That's not bad. I was talking to a physics prof. (UC Davis?) who
had an experiment where he put together different lengths of 50 and 75
ohm
cable, making variable wavelength 'sturctures'.
And drove it with a ~50MHz. generator.

George H.

J

#### Joerg

Jan 1, 1970
0
Klaus said:
Hi

For a test setup I often need an analog signal to feed into the
device under test.

So I need a instrument with an anlog output. It needs to run on RS232
or USB

I could roll my own, with a eval board, but have no time to spend on
that

Anyone know of a cheap model (no the National Instruments, NIDaqs,
they are prohibitive expensive)

This is the one I use for that purpose:

http://labjack.com/u3

That way you have it in a sturdy plastic housing. Comes with the lite
version of DAQFActory which is quite useful. I really like it. Well,
except for that blood-red color.

This device is also handy for niftier test setups. For example "I want
this line to switch to 3V tomorrow at 10:16am but only if there is
enough daylight, and then gradually ramp down to 0V until evening".

K

#### Klaus Kragelund

Jan 1, 1970
0
This is the one I use for that purpose:

http://labjack.com/u3

That way you have it in a sturdy plastic housing. Comes with the lite

version of DAQFActory which is quite useful. I really like it. Well,

except for that blood-red color.

This device is also handy for niftier test setups. For example "I want

this line to switch to 3V tomorrow at 10:16am but only if there is

enough daylight, and then gradually ramp down to 0V until evening".

Thats a nice device and in the right pricerange, thanks

Regards

Klaus

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