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B&K 4007DDS sweep generator

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oparr@hotmail.com
Guest

Sun Sep 13, 2009 8:45 pm   



Anyone familiar with this or 4013DDS? Normally, one can read the
manual for a product before buyng to get a pretty good idea of what it
can do but in this case the manual is far from being comprehensive;

http://www.bkprecision.com/products/docs/manuals/4007DDS_manual.pdf

I'm used to range confining function generators that prevent you from
manually "sweeping" from say 10Hz to 400KHz in one go. The 4007DDS
manual says the following but doesn't elaborate any further;

"It provides sine & square wave outputs over the frequency range from
0.1 Hz to 7 MHz in one
extended range (triangle/ramped wave outputs to 100KHz)."

Am I to assume that I can now set a square wave range with start/stop
frequencies of say 10Hz/400KHz then either manually "sweep" or program
sweeps from 10Hz to 400KHz with this puppy?

Thanks! (I'll call B&K next)

Jamie
Guest

Sun Sep 13, 2009 8:45 pm   



oparr_at_hotmail.com wrote:
Quote:
Anyone familiar with this or 4013DDS? Normally, one can read the
manual for a product before buyng to get a pretty good idea of what it
can do but in this case the manual is far from being comprehensive;

http://www.bkprecision.com/products/docs/manuals/4007DDS_manual.pdf

I'm used to range confining function generators that prevent you from
manually "sweeping" from say 10Hz to 400KHz in one go. The 4007DDS
manual says the following but doesn't elaborate any further;

"It provides sine & square wave outputs over the frequency range from
0.1 Hz to 7 MHz in one
extended range (triangle/ramped wave outputs to 100KHz)."

Am I to assume that I can now set a square wave range with start/stop
frequencies of say 10Hz/400KHz then either manually "sweep" or program
sweeps from 10Hz to 400KHz with this puppy?

Thanks! (I'll call B&K next)

Yes. That is what a sweep function generator does.


You should be able to sweep the whole range if you wish.

I just looked at where I bought my Regal function generator recently,
and it seems it's no longer made. To bad, because its a nice one that
got replaced by a 40/25 Mhz version. How ever, these have arbitrary
functions in them that allows you to design your own wave forms and has
USB host for drive stick etc.

I paid $450 for mine. It would of been a much better deal if they
still had some.

The replacement units now cost under $1k.

oparr@hotmail.com
Guest

Sun Sep 13, 2009 11:03 pm   



Quote:
Yes. That is what a sweep function generator does.
You should be able to sweep the whole range if you wish.

Thanks! I see sweep function generators with range switches and you
can only manually operate within each range at a time. This is what
I'm trying to avoid since that would be no different to the function
generator I'm now using. Are you saying that in such cases the
programmable sweep range would not be limited to these ranges?

On Sep 13, 3:36 pm, Jamie
<jamie_ka1lpa_not_valid_after_ka1l...@charter.net> wrote:
>

Jamie
Guest

Sun Sep 13, 2009 11:38 pm   



oparr_at_hotmail.com wrote:

Quote:
Yes. That is what a sweep function generator does.
You should be able to sweep the whole range if you wish.


Thanks! I see sweep function generators with range switches and you
can only manually operate within each range at a time. This is what
I'm trying to avoid since that would be no different to the function
generator I'm now using. Are you saying that in such cases the
programmable sweep range would not be limited to these ranges?

On Sep 13, 3:36 pm, Jamie
jamie_ka1lpa_not_valid_after_ka1l...@charter.net> wrote:

DDS technology is a synthesis of the frequency, little is

done as for as, RC type of circuits being switch in/out over the
range. Your range seems to be minor in demand.


This is digitally done, so there is not reason why it can't be done.
I've never tried that with mine because I don't need that wide of a
sweep how ever, I know that I can put in any start and any end I want
, up to the limits of the unit, which 20 mhz.

George Herold
Guest

Mon Sep 14, 2009 3:46 pm   



On Sep 13, 2:45 pm, "op...@hotmail.com" <op...@hotmail.com> wrote:
Quote:
Anyone familiar with this or 4013DDS? Normally, one can read the
manual for a product before buyng to get a pretty good idea of what it
can do but in this case the manual is far from being comprehensive;

http://www.bkprecision.com/products/docs/manuals/4007DDS_manual.pdf

I'm used to range confining function generators that prevent you from
manually "sweeping" from say 10Hz to 400KHz in one go. The 4007DDS
manual says the following but doesn't elaborate any further;

"It provides sine & square wave outputs over the frequency range from
0.1 Hz to 7 MHz in one
extended range (triangle/ramped wave outputs to 100KHz)."

Am I to assume that I can now set a square wave range with start/stop
frequencies of say 10Hz/400KHz then either manually "sweep" or program
sweeps from 10Hz to 400KHz with this puppy?

Thanks! (I'll call B&K next)

I needed a frequency generator that had sub Hz resolution. We bought
this cheap one from protek and I really like it. The manual also
stinks.


George H.

Bob Masta
Guest

Tue Sep 15, 2009 12:49 pm   



On Mon, 14 Sep 2009 06:46:30 -0700 (PDT), George
Herold <ggherold_at_gmail.com> wrote:

Quote:

I needed a frequency generator that had sub Hz resolution. We bought
this cheap one from protek and I really like it. The manual also
stinks.

For anyone that doesn't need to go outside the
sound card audio range, the signal generator in
Daqarta uses your sound card and provides
resolution of 1/65536 Hz (0.000015 Hz). It's
totally free. (Daqarta's 30-session/30-day trial
period applies to using the inputs... the outputs
from the generator continue to work forever.)

Best regards,


Bob Masta

DAQARTA v4.51
Data AcQuisition And Real-Time Analysis
www.daqarta.com
Scope, Spectrum, Spectrogram, Sound Level Meter
FREE Signal Generator
Science with your sound card!

oparr@hotmail.com
Guest

Tue Sep 15, 2009 7:09 pm   



Quote:

              DAQARTA  v4.51
   Data AcQuisition And Real-Time Analysis
             www.daqarta.com
Scope, Spectrum, Spectrogram, Sound Level Meter
           FREE Signal Generator
        Science with your sound card!

Relevant and useful spam, thanks!

George Herold
Guest

Wed Sep 16, 2009 2:17 am   



On Sep 15, 1:09 pm, "op...@hotmail.com" <op...@hotmail.com> wrote:
Quote:
              DAQARTA  v4.51
   Data AcQuisition And Real-Time Analysis
             www.daqarta.com
Scope, Spectrum, Spectrogram, Sound Level Meter
           FREE Signal Generator
        Science with your sound card!

Relevant and useful spam, thanks!

Hmm that's not spam then... bacon?

Bob, I mean to drop you an email also.

George H.
(gherold_at_teacshspin.com)

Jamie
Guest

Sat Sep 19, 2009 4:13 pm   



oparr_at_hotmail.com wrote:
Quote:
Called B&K and asked a few questions about the 4007DDS. The fellow
actually had one working nearby apparently and we went through its
paces over the phone. I recall him mumbling something about the
resolution of the frequency control but paid it no mind and went ahead
and ordered one....Big mistake!!!

All the range buttons do is move the decimal point up and down which
would be okay provided frequency control had a coarse option. Instead,
frequency control seems to be via some multiturn rotary optical device
which is good from a "no pot wear perspective" but it takes like 10
revs of the control knob just to change the frequency from say 1KHz to
5KHz. Now I understand what the fellow was saying about
resolution....It's too darn fine!!!

But it doesn't end there...You lose the last frequency and decimal
setting when you turn off the device because it's all digital without
any memory. Also, the waveform selection switches are momentary so you
cannot "lock" the waveform. Long story short....You are returned to a
sinusoidal 1KHz frequency every time you switch on the device. The
workaround for that seems to be to leave it on....What a POS!!!

Finally, I'm yet to figure out how to have the frequency displayed
during sweeps. Maybe this is normal for sweep generators. Whatever,
I'm returning it even if it entails a restocking fee.

What I really want now is a programmable ramp generator and connect it
to the VCG input of my function generator. That way I can sweep up and
hold at the high end or sweep up then down continuously. Sweeping up
then starting over from the low end was never really a preference
anyway. Tried using low frequency 4007DDS triangle output as a RG but
have to keep adjusting the offset every time output level is
adjusted....A PITA.
You need something like this.

http://www.tequipment.net/RigolDG2021A.html

I have a slightly older version that isn't as high in freq but
does basically the same.
These units have USB storage options and so on how ever, you'll
pay some money.

P.S.
That unit you got should of at least been able to retain it's last
set up from power cycle. That's a bad idea in equipment like that..

Also, normally you have a function to adjust the freq in digit segment
places. I don't understand why that one does not allow it.

oparr@hotmail.com
Guest

Sat Sep 19, 2009 4:55 pm   



Called B&K and asked a few questions about the 4007DDS. The fellow
actually had one working nearby apparently and we went through its
paces over the phone. I recall him mumbling something about the
resolution of the frequency control but paid it no mind and went ahead
and ordered one....Big mistake!!!

All the range buttons do is move the decimal point up and down which
would be okay provided frequency control had a coarse option. Instead,
frequency control seems to be via some multiturn rotary optical device
which is good from a "no pot wear perspective" but it takes like 10
revs of the control knob just to change the frequency from say 1KHz to
5KHz. Now I understand what the fellow was saying about
resolution....It's too darn fine!!!

But it doesn't end there...You lose the last frequency and decimal
setting when you turn off the device because it's all digital without
any memory. Also, the waveform selection switches are momentary so you
cannot "lock" the waveform. Long story short....You are returned to a
sinusoidal 1KHz frequency every time you switch on the device. The
workaround for that seems to be to leave it on....What a POS!!!

Finally, I'm yet to figure out how to have the frequency displayed
during sweeps. Maybe this is normal for sweep generators. Whatever,
I'm returning it even if it entails a restocking fee.

What I really want now is a programmable ramp generator and connect it
to the VCG input of my function generator. That way I can sweep up and
hold at the high end or sweep up then down continuously. Sweeping up
then starting over from the low end was never really a preference
anyway. Tried using low frequency 4007DDS triangle output as a RG but
have to keep adjusting the offset every time output level is
adjusted....A PITA.

Michael A. Terrell
Guest

Sat Sep 19, 2009 6:53 pm   



"oparr_at_hotmail.com" wrote:
Quote:

Called B&K and asked a few questions about the 4007DDS. The fellow
actually had one working nearby apparently and we went through its
paces over the phone. I recall him mumbling something about the
resolution of the frequency control but paid it no mind and went ahead
and ordered one....Big mistake!!!

All the range buttons do is move the decimal point up and down which
would be okay provided frequency control had a coarse option. Instead,
frequency control seems to be via some multiturn rotary optical device
which is good from a "no pot wear perspective" but it takes like 10
revs of the control knob just to change the frequency from say 1KHz to
5KHz. Now I understand what the fellow was saying about
resolution....It's too darn fine!!!

But it doesn't end there...You lose the last frequency and decimal
setting when you turn off the device because it's all digital without
any memory. Also, the waveform selection switches are momentary so you
cannot "lock" the waveform. Long story short....You are returned to a
sinusoidal 1KHz frequency every time you switch on the device. The
workaround for that seems to be to leave it on....What a POS!!!

Finally, I'm yet to figure out how to have the frequency displayed
during sweeps. Maybe this is normal for sweep generators. Whatever,
I'm returning it even if it entails a restocking fee.

What I really want now is a programmable ramp generator and connect it
to the VCG input of my function generator. That way I can sweep up and
hold at the high end or sweep up then down continuously. Sweeping up
then starting over from the low end was never really a preference
anyway. Tried using low frequency 4007DDS triangle output as a RG but
have to keep adjusting the offset every time output level is
adjusted....A PITA.


If you want lab grade, you have to pay for it. Look for a good used
HP 3325B.


--
You can't have a sense of humor, if you have no sense!

Michael A. Terrell
Guest

Sat Sep 19, 2009 6:54 pm   



Jamie wrote:
Quote:

oparr_at_hotmail.com wrote:
Called B&K and asked a few questions about the 4007DDS. The fellow
actually had one working nearby apparently and we went through its
paces over the phone. I recall him mumbling something about the
resolution of the frequency control but paid it no mind and went ahead
and ordered one....Big mistake!!!

All the range buttons do is move the decimal point up and down which
would be okay provided frequency control had a coarse option. Instead,
frequency control seems to be via some multiturn rotary optical device
which is good from a "no pot wear perspective" but it takes like 10
revs of the control knob just to change the frequency from say 1KHz to
5KHz. Now I understand what the fellow was saying about
resolution....It's too darn fine!!!

But it doesn't end there...You lose the last frequency and decimal
setting when you turn off the device because it's all digital without
any memory. Also, the waveform selection switches are momentary so you
cannot "lock" the waveform. Long story short....You are returned to a
sinusoidal 1KHz frequency every time you switch on the device. The
workaround for that seems to be to leave it on....What a POS!!!

Finally, I'm yet to figure out how to have the frequency displayed
during sweeps. Maybe this is normal for sweep generators. Whatever,
I'm returning it even if it entails a restocking fee.

What I really want now is a programmable ramp generator and connect it
to the VCG input of my function generator. That way I can sweep up and
hold at the high end or sweep up then down continuously. Sweeping up
then starting over from the low end was never really a preference
anyway. Tried using low frequency 4007DDS triangle output as a RG but
have to keep adjusting the offset every time output level is
adjusted....A PITA.
You need something like this.
http://www.tequipment.net/RigolDG2021A.html

I have a slightly older version that isn't as high in freq but
does basically the same.
These units have USB storage options and so on how ever, you'll
pay some money.

P.S.
That unit you got should of at least been able to retain it's last
set up from power cycle. That's a bad idea in equipment like that..


In YOUR opnion only.

Quote:

Also, normally you have a function to adjust the freq in digit segment
places. I don't understand why that one does not allow it.


Simple. It wasn't designed to.


--
You can't have a sense of humor, if you have no sense!

Jamie
Guest

Sat Sep 19, 2009 7:47 pm   



Michael A. Terrell wrote:

Quote:
Jamie wrote:

oparr_at_hotmail.com wrote:

Called B&K and asked a few questions about the 4007DDS. The fellow
actually had one working nearby apparently and we went through its
paces over the phone. I recall him mumbling something about the
resolution of the frequency control but paid it no mind and went ahead
and ordered one....Big mistake!!!

All the range buttons do is move the decimal point up and down which
would be okay provided frequency control had a coarse option. Instead,
frequency control seems to be via some multiturn rotary optical device
which is good from a "no pot wear perspective" but it takes like 10
revs of the control knob just to change the frequency from say 1KHz to
5KHz. Now I understand what the fellow was saying about
resolution....It's too darn fine!!!

But it doesn't end there...You lose the last frequency and decimal
setting when you turn off the device because it's all digital without
any memory. Also, the waveform selection switches are momentary so you
cannot "lock" the waveform. Long story short....You are returned to a
sinusoidal 1KHz frequency every time you switch on the device. The
workaround for that seems to be to leave it on....What a POS!!!

Finally, I'm yet to figure out how to have the frequency displayed
during sweeps. Maybe this is normal for sweep generators. Whatever,
I'm returning it even if it entails a restocking fee.

What I really want now is a programmable ramp generator and connect it
to the VCG input of my function generator. That way I can sweep up and
hold at the high end or sweep up then down continuously. Sweeping up
then starting over from the low end was never really a preference
anyway. Tried using low frequency 4007DDS triangle output as a RG but
have to keep adjusting the offset every time output level is
adjusted....A PITA.

You need something like this.
http://www.tequipment.net/RigolDG2021A.html

I have a slightly older version that isn't as high in freq but
does basically the same.
These units have USB storage options and so on how ever, you'll
pay some money.

P.S.
That unit you got should of at least been able to retain it's last
set up from power cycle. That's a bad idea in equipment like that..



In YOUR opnion only.


Also, normally you have a function to adjust the freq in digit segment
places. I don't understand why that one does not allow it.



Simple. It wasn't designed to.


You're so enthusiastic, its just making me jump

up and down in joy!.

Phil Hobbs
Guest

Sat Sep 19, 2009 8:31 pm   



Michael A. Terrell wrote:
Quote:
"oparr_at_hotmail.com" wrote:
Called B&K and asked a few questions about the 4007DDS. The fellow
actually had one working nearby apparently and we went through its
paces over the phone. I recall him mumbling something about the
resolution of the frequency control but paid it no mind and went ahead
and ordered one....Big mistake!!!

All the range buttons do is move the decimal point up and down which
would be okay provided frequency control had a coarse option. Instead,
frequency control seems to be via some multiturn rotary optical device
which is good from a "no pot wear perspective" but it takes like 10
revs of the control knob just to change the frequency from say 1KHz to
5KHz. Now I understand what the fellow was saying about
resolution....It's too darn fine!!!

But it doesn't end there...You lose the last frequency and decimal
setting when you turn off the device because it's all digital without
any memory. Also, the waveform selection switches are momentary so you
cannot "lock" the waveform. Long story short....You are returned to a
sinusoidal 1KHz frequency every time you switch on the device. The
workaround for that seems to be to leave it on....What a POS!!!

Finally, I'm yet to figure out how to have the frequency displayed
during sweeps. Maybe this is normal for sweep generators. Whatever,
I'm returning it even if it entails a restocking fee.

What I really want now is a programmable ramp generator and connect it
to the VCG input of my function generator. That way I can sweep up and
hold at the high end or sweep up then down continuously. Sweeping up
then starting over from the low end was never really a preference
anyway. Tried using low frequency 4007DDS triangle output as a RG but
have to keep adjusting the offset every time output level is
adjusted....A PITA.


If you want lab grade, you have to pay for it. Look for a good used
HP 3325B.

They aren't very expensive just now.

Cheers

Phil Hobbs

--
Dr Philip C D Hobbs
Principal
ElectroOptical Innovations
55 Orchard Rd
Briarcliff Manor NY 10510
845-480-2058
hobbs at electrooptical dot net
http://electrooptical.net

Michael A. Terrell
Guest

Sun Sep 20, 2009 12:39 am   



Jamie wrote:
Quote:

Michael A. Terrell wrote:

Jamie wrote:

oparr_at_hotmail.com wrote:

Called B&K and asked a few questions about the 4007DDS. The fellow
actually had one working nearby apparently and we went through its
paces over the phone. I recall him mumbling something about the
resolution of the frequency control but paid it no mind and went ahead
and ordered one....Big mistake!!!

All the range buttons do is move the decimal point up and down which
would be okay provided frequency control had a coarse option. Instead,
frequency control seems to be via some multiturn rotary optical device
which is good from a "no pot wear perspective" but it takes like 10
revs of the control knob just to change the frequency from say 1KHz to
5KHz. Now I understand what the fellow was saying about
resolution....It's too darn fine!!!

But it doesn't end there...You lose the last frequency and decimal
setting when you turn off the device because it's all digital without
any memory. Also, the waveform selection switches are momentary so you
cannot "lock" the waveform. Long story short....You are returned to a
sinusoidal 1KHz frequency every time you switch on the device. The
workaround for that seems to be to leave it on....What a POS!!!

Finally, I'm yet to figure out how to have the frequency displayed
during sweeps. Maybe this is normal for sweep generators. Whatever,
I'm returning it even if it entails a restocking fee.

What I really want now is a programmable ramp generator and connect it
to the VCG input of my function generator. That way I can sweep up and
hold at the high end or sweep up then down continuously. Sweeping up
then starting over from the low end was never really a preference
anyway. Tried using low frequency 4007DDS triangle output as a RG but
have to keep adjusting the offset every time output level is
adjusted....A PITA.

You need something like this.
http://www.tequipment.net/RigolDG2021A.html

I have a slightly older version that isn't as high in freq but
does basically the same.
These units have USB storage options and so on how ever, you'll
pay some money.

P.S.
That unit you got should of at least been able to retain it's last
set up from power cycle. That's a bad idea in equipment like that..



In YOUR opnion only.


Also, normally you have a function to adjust the freq in digit segment
places. I don't understand why that one does not allow it.



Simple. It wasn't designed to.


You're so enthusiastic, its just making me jump
up and down in joy!.


Good. Now find an open manhole cover...


--
You can't have a sense of humor, if you have no sense!

Goto page 1, 2  Next

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