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Generators & Motors General Discussion Antique Generators, Light Plants and Old Electric Motors: Questions and answers about restoring and showing old power generation systems.

Generators & Motors General Discussion

Hertz gauge


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Old 03-02-2008, 01:06 AM
panzerwillie panzerwillie is offline
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Smile Hertz gauge

i have several herzt frequency gauges that are for generators, most of the ones i use are up to 65 herzt but this one are 0-120 herzt, it saids it requieres 10 VDC those any one know where i can get the converters that will work with them
thank you
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Old 03-02-2008, 04:47 AM
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ListerDiesel ListerDiesel is offline
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Default Re: Hertz gauge

Sounds like you have an electronic version that requires a DC supply AND a link to the AC side to read the frequency.

A better solution is to get one of the FRAHM vibrating reed Hz meters that are purely AC fed and run off the generator output. 'Walter A Biddle' I think were the company that makes/made them, we have a couple here from the 1970's.

They will also work by direct mechanical coupling. If you lay one against a generator that has something vibrating at the right speed, the reeds will vibrate in sympathy.

Peter
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Old 03-02-2008, 09:01 AM
armandh armandh is offline
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Default Re: Hertz gauge

10 VDC try a typical wall plug power supply [12V and put a diode or several in series.]
be sure it is able to supply the needed current
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Old 03-02-2008, 09:09 AM
armandh armandh is offline
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Default Re: Hertz gage

if you have just a meter that gives full reading at 10 volts then you need a transformer and a capacitor in series plus a diode to form a travis discriminator, calibration should be lots of fun.

as the hertz goes up the cap passes more energy to the transformer. the rectified output of the transformer produces a rising dc output any volt meter will work

I find the easy way to set the HZ is an electric clock [motor driven with a sweep second hand] compared to a quarts watch with a seconds display or hand.
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Old 03-02-2008, 11:31 PM
panzerwillie panzerwillie is offline
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Smile Re: Hertz gauge

thanks for all the replys, see if i understand i have several a/c to dc transformers, probably in the 10 DCV as requiere by the hertz gauge, does it matter where i put the diode, and why more than one
thanks
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Old 03-03-2008, 12:43 AM
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EricWood EricWood is offline
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Default Re: Hertz gauge

A lot of military generator sets used frequency meters that were driven by transducers.

The link is provided merely for an example of such a transducer, that can be used to operate a frequency meter.

http://www.powertekuk.com/frequency.htm

eric
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Old 03-03-2008, 01:28 AM
Stephen Girouard Stephen Girouard is offline
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Default Re: Hertz gauge

if your gauges are pretty old they could be from receiving or transmitting equipment, radio,etc from the vacume tube era, not to many freq. meters from generator cycle equipment read up to 120 hz, i'v seen those somewhere before but just cant think where, how many terminals on the back and if there marked?
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Old 03-03-2008, 12:16 PM
panzerwillie panzerwillie is offline
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Smile Re: Hertz gauge

it has 2 terminal and i conected a 12 volt battey and the gauge sweep to 120 hertz with a 6 volt battery 72 hertz i use one of many military transducers that woek with 65 hertz gauges but did not work, maybe is not worth all the trouble
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Old 03-04-2008, 01:38 PM
Stephen Girouard Stephen Girouard is offline
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Default Re: Hertz gauge

i tried alot of that not to have to spend 100$ on a good panel gauge, i had afew odd ball meeters i never had much luck, freq meeters are very sensative now i just ordered a few p3 kill a watt meters they do it all for 35$ ,i hadn't had one fail yet, there as acurate as a good fluke meeter
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Old 03-04-2008, 03:48 PM
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Default Re: Hertz gage

a diode in a DC line will drop the voltage about 1.2 volts
same for zeners to reduce the voltage.
but if there are only 2 terminals and 10 volts gives the meter the highest reading you do not need a power supply
rather you need a sending device to provide a dc voltage that varies with the frequency of the input
not an easy trick from the parts box
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