HP 3312A Square wave  - Page 1
Forum section: electronics / testgear

author: Aztlanpz
author_rank: Regular Contributor
timestamp: August 08, 2015, 02:54:56 am
content: Is that an acceptable square wave, with in calibration for an Hp 3312A function generator?

author: rf-loop
author_rank: Super Contributor
timestamp: August 08, 2015, 08:20:51 am
content: Quote from: Aztlanpz on August 08, 2015, 02:54:56 am3212A, what year Hewlett-Packard have manufactured this model, if really 3212A then please picture?If signal is from 3312A output then answer is yes, ( including your measurement total errors, scope errors, impedance match...etc)

author: codeboy2k
author_rank: Super Contributor
timestamp: August 08, 2015, 09:25:12 am
content: There is no 3212A function generator that I know of. Did you mean the 3312A ?The 12.8974 MHz frequency shown on the scope is leading me to think that you actually mean the 3312A, since it has a maximum output of 13 MHz, so you possibly "wound the wick" up and scoped it.The 3312A is spec'd at 20 ns rise and fall time @ 3MHz, so I think that the 14 ns you are seeing for the rise and fall times is not too bad for 13 MHz.Even the HP 33120A 15MHz ARB has a rise/fall time spec'ed at < 20 ns.(oops.. rf-loop beat me to the same conclusion)

author: dom0
author_rank: Super Contributor
timestamp: August 08, 2015, 11:08:59 am
content: Quote from: Aztlanpz on August 08, 2015, 02:54:56 am1.) Open manual2.) Open "Specifications" chapter3.) Look for square wave specifications4.) Validate specifications like rise time, fall time, symmetry, aberrations at specified frequencies.

author: Aztlanpz
author_rank: Regular Contributor
timestamp: August 08, 2015, 12:17:35 pm
content: Sorry it is the hp 3312a and I am useing a 50 ohms impedance termination Rigol PL-50

author: Aztlanpz
author_rank: Regular Contributor
timestamp: August 08, 2015, 02:28:14 pm
content: The faster the rise time the better is that correct. The picture below is from the Vp-p output

author: Paul Moir
author_rank: Frequent Contributor
timestamp: August 08, 2015, 02:41:28 pm
content: Seems to match mine:https://www.eevblog.com/forum/testgear/show-us-your-square-wave/msg588002/#msg588002Is that second one pictured from the SYNC output? The SYNC output has sharper rise/fall times.Whether quicker rise/fall times are better is a matter of application. But probably the answer is yes.EDIT: if your Rigol is still at 50MHz, even a very sharp 13MHz square wave will start to appear curvy since you've got attenuation at the higher harmonics: 13MHz fundamental, 3rd - 39MHz, 5th - 65MHz, 7th - 91MHz, etc.

author: Aztlanpz
author_rank: Regular Contributor
timestamp: August 08, 2015, 02:43:41 pm
content: The picture below is from the SYNC output

author: dom0
author_rank: Super Contributor
timestamp: August 08, 2015, 03:02:37 pm
content: Quote from: Aztlanpz on August 08, 2015, 02:28:14 pm"Depends"Dedicated pulse generators almost always have adjustable transition speeds, for a number of good reasons.

author: Paul Moir
author_rank: Frequent Contributor
timestamp: August 08, 2015, 03:03:55 pm
content: Just double checking mine - I get about 14ns @ 13MHz and about 12ns @ 3MHz. I "measure" 7ns from the VSYNC but I'm starting to get into the mud on my 100MHz 465.

author: Aztlanpz
author_rank: Regular Contributor
timestamp: August 08, 2015, 03:04:31 pm
content: What I am trying to determine is if my function generator is with in specifications

author: dom0
author_rank: Super Contributor
timestamp: August 08, 2015, 03:05:22 pm
content: Quote from: Paul Moir on August 08, 2015, 03:03:55 pmA 100 MHz scope should have a rise time of <3.5 ns.

author: dom0
author_rank: Super Contributor
timestamp: August 08, 2015, 03:06:26 pm
content: Quote from: Aztlanpz on August 08, 2015, 03:04:31 pmAs I said above you need to read the data sheet or manual of it. I won't do it for you.

author: Paul Moir
author_rank: Frequent Contributor
timestamp: August 08, 2015, 03:08:24 pm
content: Quote from: dom0 on August 08, 2015, 03:05:22 pmI know.

author: Aztlanpz
author_rank: Regular Contributor
timestamp: August 08, 2015, 03:13:06 pm
content: From the manual "Square Wave rise or fall time < 20 nsec at 3 MHz " I am getting 15ns there for its with in spec. Corrected?

author: Paul Moir
author_rank: Frequent Contributor
timestamp: August 08, 2015, 03:37:33 pm
content: Yes.

author: Aztlanpz
author_rank: Regular Contributor
timestamp: August 08, 2015, 03:42:42 pm
content: I am having a hard time setting up a sweep from the steps in the manual any help will be appreciated

author: Paul Moir
author_rank: Frequent Contributor
timestamp: August 08, 2015, 04:07:24 pm
content: 0-10KHz in about 1 second:Setup a 10KHz wave on the left hand side; range to 1k, dial to 10.Now setup the sweep on the right hand side. Press in the SWP button in, turn the knob below it (now the sweep start frequency control) fully clockwise. Set the Range Hz to 1, and crank the vernier on top of it fully clockwise.EDIT: Oh, make sure the SYMmetry control on the right hand side is in CAL or it will sweep up and down.

author: Aztlanpz
author_rank: Regular Contributor
timestamp: August 08, 2015, 04:33:21 pm
content: Thanks I will try it when I get home

author: Aztlanpz
author_rank: Regular Contributor
timestamp: August 09, 2015, 12:37:44 am
content: Sorry but I could not get the sweep going can you verify that the steps are correct