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 Post subject: Frequency Counter-Cyometer advice needed
PostPosted: Apr Sat 04, 2020 7:19 pm 
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Joined: Dec Sun 16, 2007 4:59 am
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Location: Minnetonka, MN 55305
Vintage analog signal generators are difficult to tune precisely. Most of us use a frequency counter to dial them in. Is a cheap Chinese cryometer a reliable modern means to accomplish digital accuracy for our old generators? If so which one do you recommend? Thank you and be well.

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 Post subject: Re: Frequency Counter-Cyometer advice needed
PostPosted: Apr Sat 04, 2020 8:42 pm 
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A "cryometer" (not cyometer mentioned in the title)) is a thermometer for measuring very low temperatures. Probably won't work with an RF signal generator.

Dave


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 Post subject: Re: Frequency Counter-Cyometer advice needed
PostPosted: Apr Sat 04, 2020 8:58 pm 
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I have been impressed with the PLJ-8LED "cymometer" from Sanjian studio, China via Ebay.
A copy of the user manual is available: https://www.manualslib.com/download/152 ... led-C.html
-Chuck K7MCG


Last edited by K7MCG on Apr Sat 04, 2020 9:10 pm, edited 1 time in total.

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 Post subject: Re: Frequency Counter-Cyometer advice needed
PostPosted: Apr Sat 04, 2020 9:08 pm 
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Note to self: Proofread post before sending. I know what a CRYOMETER is but somehow an R wandered into CYOMETER. Please note: My subject says CYOMETER so the "won't detect RF" wasn't revelatory. Thank you for the specific recommendation K7MCG. I'll order one and report back.

PS. Wasn't there a vintage TV SOB STORY contestant program that measured audience sympathy with a cryometer? :D

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 Post subject: Re: Frequency Counter-Cyometer advice needed
PostPosted: Apr Sat 04, 2020 10:50 pm 
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I ordered the PLJ-8LED Cyometer from eBay. PLJ-8LED-H RF Signal Frequency Counter Meter Tester Module 0.1~1000MHz LED KW. Less than $13 shipped if anyone is interested. The "CRYOMETER" typo was the spell correct in this program. It doesn't recognize cyometer.

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 Post subject: Re: Frequency Counter-Cyometer advice needed
PostPosted: Apr Sat 04, 2020 11:03 pm 
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I am sorry, but this one has me stumped. What is a Cyometer ? Looking on the web has a lot of stuff related to every thing but electronics (or at lest a lot of stuff that overloaded my search). Is this a frequency counter that can be offset by the IF frequency to get a direct readout of the radios tuned input frequency ?

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 Post subject: Re: Frequency Counter-Cyometer advice needed
PostPosted: Apr Sun 05, 2020 12:23 am 
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pauls.ironhorse wrote:
I am sorry, but this one has me stumped. What is a Cyometer ?

As Chuck said above, it’s “cymometer”. It’s a synonym for “frequency counter”. Why the Chinese use that term in their eBay ads, I don’t know.

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 Post subject: Re: Frequency Counter-Cyometer advice needed
PostPosted: Apr Sun 05, 2020 1:57 am 
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Location: Santa Rosa, CA
I've bought and used several of these and they are one of the
best test equipment bargains around IMO. Yes, the 6 or 8
digit version will work fine for your sig gen. Make sure you
look at the manual as it can be programmed for a number
of things like blank leading digit, gate times, brightness, etc.

My fave is the blue. No rational reason for it other than its
unusual and stands out next to other equipment that uses
red LED displays.

One thing to know...there are two connectors with wires included.
The one going to the power is correct (red +, black -)
but the input connector may be backward (red ground, black input).
Check board labeling to be sure.
Steve

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 Post subject: Re: Frequency Counter-Cyometer advice needed
PostPosted: Apr Sun 05, 2020 3:24 am 
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stevebyan wrote:
As Chuck said above, it’s “cymometer”. It’s a synonym for “frequency counter”. Why the Chinese use that term in their eBay ads, I don’t know.

Thanks for clarifying , it probably one of those direct translation programs that don't always make sense after translation.

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 Post subject: Re: Frequency Counter-Cyometer advice needed
PostPosted: Apr Sun 05, 2020 3:30 am 
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Glad this came up. Was just getting ready to ask on here about frequency counters.


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 Post subject: Re: Frequency Counter-Cyometer advice needed
PostPosted: Apr Sun 05, 2020 3:32 am 
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Thank you Zarco for the heads up regarding the input polarity. Will definitely check the board. This unit comes without a case or box. How did you choose to house it?

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 Post subject: Re: Frequency Counter-Cyometer advice needed
PostPosted: Apr Sun 05, 2020 5:41 am 
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These are great little counters. I put one in my Gates modulation meter so I have both parameters in one spot. I too like the Blue display and put a piece of 3M blue transparent tape over the display to increase the contrast.

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 Post subject: Re: Frequency Counter-Cyometer advice needed
PostPosted: Apr Sun 05, 2020 3:07 pm 
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GSD wrote:
Thank you Zarco for the heads up regarding the input polarity. Will definitely check the board. This unit comes without a case or box. How did you choose to house it?


Some of mine will be mounted in receivers. One of the nicest features of these is
you can program in an IF offset which makes them a nice upgrade for older
single conversion receivers.

The case I've used was the extruded aluminum from an old Hayes modem.
You can saw these in half to get two cases. Its the perfect size for the 6 digit.
Be creative. I've also made cases for things like this from walnut
blocks (fire wood) by hollowing out the center. Takes time but look
great.
Steve

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 Post subject: Re: Frequency Counter-Cyometer advice needed
PostPosted: Apr Sun 05, 2020 5:13 pm 
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Here is my version of one of these frequency counters on an Eico 324. see viewtopic.php?f=8&t=350360. You don't need eight digit display for any of these signal generators, I could barely fit this 5 digit counter.


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Eico 324.png
Eico 324.png [ 209.36 KiB | Viewed 712 times ]
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 Post subject: Re: Frequency Counter-Cyometer advice needed
PostPosted: Apr Sun 05, 2020 5:19 pm 
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Joined: Dec Sun 16, 2007 4:59 am
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Location: Minnetonka, MN 55305
Thanks for the photos. Mounting directly into the signal generator makes sense of course. I have been thinking of a creative case and will no doubt find something that works. I now regret tossing an old digital clock. It would have been perfect for this. If I can bring myself to cut an opening in my SG what do you guys recommend for a method that results in a clean opening?

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 Post subject: Re: Frequency Counter-Cyometer advice needed
PostPosted: Apr Sun 05, 2020 5:41 pm 
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I used one of these nibbling tool and then flle it clean.


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 Post subject: Re: Frequency Counter-Cyometer advice needed
PostPosted: Apr Sun 05, 2020 6:05 pm 
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upsss wrote:
I used one of these nibbling tool

https://adelnibbler.com

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 Post subject: Re: Frequency Counter-Cyometer advice needed
PostPosted: Apr Mon 06, 2020 7:45 am 
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:D
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c cccc.jpg
c cccc.jpg [ 44.25 KiB | Viewed 644 times ]

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 Post subject: Re: Frequency Counter-Cyometer advice needed
PostPosted: Apr Mon 06, 2020 5:19 pm 
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CYOMETER or CYMOMETER. That is the question :o

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 Post subject: Re: Frequency Counter-Cyometer advice needed
PostPosted: Apr Thu 30, 2020 6:05 pm 
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Location: Minnetonka, MN 55305
The PLJ-8LED-H RF Signal Frequency Counter Meter Tester Module arrived today with no instructions. Does someone have a manual that can be posted. A link? Previous poster alerted me to the polarity at the input end but I don't know what the DC input voltage should be for the display. Also, those of you who wired it into your generator directly and mounted it on the front might post a wiring diagram? Thank you.

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