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Re: S11 and S22 comparisons on 8753
The cal kit the 8753 is supposed to work with is the 85032B - see the 8753 manual. The 85032B needs the extender, as I
By David Kirkby <david.kirkby@...> · #48411 ·
Re: 3586A encoder question
If the RPG works better in one direction it may need a small adjustment of the very small set screws on the side of the RPG near the lamp wires. This can serve to balance or direct the light
By Steve Reeves <steve_reeves@...> · #48410 ·
Re: 3586A encoder question
Excellent point. I agree. Joe
By J. L. Trantham · #48409 ·
Re: 3586A encoder question
If your RPG is the same as my 8660B the output is 2 square wave chains which lead and lag depending on the direction of travel. You can put your dual trace scope on the outputs and watch the wave
By John McClung · #48408 ·
Re: 3586A encoder question
Just sent it direct. Let me know if you do not receive it. Joe
By J. L. Trantham · #48407 ·
Re: S11 and S22 comparisons on 8753
Is that the same data you are supposed to back up to a floppy? The reason I ask, is that the manuals seem to imply this will make restoring the data much quicker if you have it on a floppy in
By David Kirkby <david.kirkby@...> · #48406 ·
Re: HP-608A Repair
I sent a message earlier regarding the resistors, but I didn't see it appear here. If this is
By doug · #48405 ·
Re: 3586A encoder question
Joe, well, as I have some other HP stuff with RPG's, having such an unit as a spare would be a good thing. I already tried reseating the connector with tiny pliers without removing the panel, but had
By Antonio Iovane · #48404 ·
Re: 3586A encoder question
The RPG's for the HP equipment I am familiar with use a T-1, 5 V, 60 mA, bulb with wire leads. The most common failure is for the bulb to burn out. For an 'intermittent failure', I would wonder
By J. L. Trantham · #48403 ·
3586A encoder question
The RPG (rotating pulse generator, i.e. the encoder) of one of my 3586A's doesn't work well. Clockwise it works well, counterclockwise it is erratic. May it be an issue in the encoder itself? I don't
By Antonio Iovane · #48402 ·
Re: HP-608A Repair
I don't have any of the 608s. I just remember repairing them when I worked as a calibration technician at Rockwell-Collins, Canada. Merchison
By Merchison Burke · #48401 ·
Re: S11 and S22 comparisons on 8753
On the 8752/8753/8720 etc., and pretty much all newer VNAs, even what you call "uncalibrated" is actually calibrated at the factory or at the service center when you send the analyzer for calibration.
By pianovt · #48400 ·
Re: S11 and S22 comparisons on 8753
Was sort of like this http://boxen.math.washington.edu/home/kirkby/85032B/all-parts-of-85032-60012.jpg though for 3.5 mm, not N as in this diagram? My own 3.5 mm kit does not have anything like
By David Kirkby <david.kirkby@...> · #48399 ·
Re: S11 and S22 comparisons on 8753
On "missing parts": some opens(mostly early, and I'm specifically thinking of APC 3.5 connectors) consisted of a body having no center conductor attached, plus an insertable center conductor on a
By David McQuate · #48398 ·
Re: HP 3456a was Re: HP 3478A general questions
Thanks again, I've downloaded the manuals on most of the HP DMM's from that era. I'm now looking at the 3456 or 3457. I've got some prices on a cal and yes around $140 should do it for a NIST
By Jeff Machesky · #48397 ·
Re: HP-608A Repair
By Richard Knoppow · #48396 ·
Re: S11 and S22 comparisons on 8753
I meant "gold plated metal", not "gold played meter" Dave
By David Kirkby <david.kirkby@...> · #48395 ·
Re: HP 3456a was Re: HP 3478A general questions
I treat buying gear much like a trip to Vegas, I save up a few dollars and enjoy myself knowing full well that I'm wasting money. In the end it's not what you pay, it's how much you enjoy the
By Jeff Machesky · #48394 ·
Re: HP 3456a was Re: HP 3478A general questions
Thanks, I guess I will have to just keep looking. For $50 I would love to have one of these, or one of its sister units. And being in Los Angeles, there is always a likelihood I can find one that
By Bob Albert <bob91343@...> · #48393 ·
Re: S11 and S22 comparisons on 8753
Merry Christmas If you have not calibrated the VNA, then you are just seeing the uncorrect performance, and the fact that varies is no surprise. In fact, I'm a bit surprised you managed to get 35 dB
By David Kirkby <david.kirkby@...> · #48391 ·