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Old 11th January 2012, 08:13 PM   #31
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Just to make sure I understand right.

The computer option has very low distortion, much lower than the function generator.
Is this true only in sine wave ?

The function generator generates square waves much better than the computer option.
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Old 11th January 2012, 08:42 PM   #32
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Hollowstage,

Could you tell me more about the Leader models that you mentioned.
Seems like the Leader LAG-120B is comparable to the HP 209A.
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Old 11th January 2012, 08:52 PM   #33
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Quote:
Originally Posted by manp111 View Post
Just to make sure I understand right.

The computer option has very low distortion, much lower than the function generator.
Is this true only in sine wave ?

The function generator generates square waves much better than the computer option.
You're right. This is the 5kHz square wave generated by my sound card
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Old 11th January 2012, 08:58 PM   #34
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haha, that's not square at all.
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Old 11th January 2012, 09:28 PM   #35
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What do you guys think of this Leader LAG-120B on ebay:
LEADER LAG-120B AUDIO GENERATOR | eBay

What are some potential problems with this unit and how likely ?
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Old 11th January 2012, 09:30 PM   #36
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I've been using a Radford LDO4 [and others] for years. Low distortion, good square wave and an oscillator stop facility.
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Old 11th January 2012, 09:32 PM   #37
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I picked one up cheap on ebay.
Has worked well for 5 years now.
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Old 11th January 2012, 09:42 PM   #38
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Quote:
Originally Posted by manp111 View Post
haha, that's not square at all.
Ringing (not that much as in #33) is inherent in digital synthesis. The DDS instrumentation ones do filter the ringing but they lack in rise time as you push them higher to their limit VS analogue ones due to LPF. Talking under 500$. Full rise time is still available on their TTL output which is not filtered and you will be able to see the inherent ringing. Very good stability in PPM over the years and great functionality is the other side of the coin. Very good signal quality is offered by TTI-Thandar made in UK in medium to low prices (relatively, as generators go), they do good analogue still.
If using soundcard FFT for THD which is great for that, there are many cheap enough good solutions for nicely shaped square waves up to 1MHz from instruments that go to 3 or 5MHz. Their THD won't be better than -50dB though.
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Old 11th January 2012, 09:45 PM   #39
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Quote:
I picked one up cheap on ebay.
Has worked well for 5 years now.
You mean the Leader LAG-120B ?
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Old 11th January 2012, 10:05 PM   #40
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Originally Posted by manp111 View Post
Hollowstage,

Could you tell me more about the Leader models that you mentioned.
Seems like the Leader LAG-120B is comparable to the HP 209A.
Leader is OK, Made in Japan, but is probably the best if the Asian imports. I've never owned one, but I have had some of their other stuff.
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