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| 53132A bad display |
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| Robaroni:
The other issue I have with counter is the fan constantly on. First, I'll have to see if there's dust build up on it but I'm wondering if the fan is primarily for the ovens which this counter doesn't have the option in. I don't like the oven in my instruments, they add heat and tax the internal power supply. I've mentioned this before around here, what I did was design a stand alone 10Mhz OCXO that I adjust to a rubidium standard which I'll be double checking against a GPSDO once it's built. I'm using two OCXO's, the Milliren 260 and Morion MV89A. Both are very good. In fact once I calibrate the OCXO to the rubidium I shut off the rubidium and only use it to check the OCXO every few months. These OCXO's hold frequency to a couple parts in 1x10-11 over a few month period. I attached a photo of the new meter with the OCXO as ref and the rubidium as input. I left it on for a few days and the drift was only a couple of parts in 1x10-12. Adjusting the OCXO is a breeze using the front knob that runs a quad encoder to a 12 digit DAC from a cheap Atmel uC. The internal voltage reference on the OCXO is pretty good but on my revision of the circuit I added an option to use an AD586 as the voltage ref. I'm waiting for the revised board to come back from my board house and then maybe I'll start a new thread with all the particulars. I really think this is a nice way to go. All you lose is the self calibrate on the 53131/2A but since the OCXO holds freq. so well it isn't a big deal. R |
| bitseeker:
Yes, the standby is to keep the reference stable and ready to go in an instant. Since you're going to have a common, external reference for your devices, you can at least turn down the fan speed. I'm not sure how much heat other components in there generate, so disabling the fan may or may not be safe. If you lab stays nice and cool and there's plenty of space around the instrument, it might be OK. |
| uncle_bob:
--- Quote from: bitseeker on May 21, 2016, 06:14:07 pm ---Yes, the standby is to keep the reference stable and ready to go in an instant. Since you're going to have a common, external reference for your devices, you can at least turn down the fan speed. I'm not sure how much heat other components in there generate, so disabling the fan may or may not be safe. If you lab stays nice and cool and there's plenty of space around the instrument, it might be OK. --- End quote --- Hi Slow down the fan and the power supply eventually self destructs. It also will do that if there simply is a bunch of dirt blocking the air flow a bit. Bob |
| TheSteve:
One option is to change the switch so it truly turns power on and off so there is no fan noise or power consumption when it is turned off. This mod is on my to-do list as I use a GPSDO for an external reference. Gerry has done a video on the mod - you can check it out here: |
| uncle_bob:
--- Quote from: TheSteve on May 21, 2016, 09:31:58 pm ---One option is to change the switch so it truly turns power on and off so there is no fan noise or power consumption when it is turned off. This mod is on my to-do list as I use a GPSDO for an external reference. Gerry has done a video on the mod - you can check it out here: --- End quote --- Hi Probably best to add some sort of time delay in with the turn off. When the fan and the supply both go off at once ... temperature climbs. It doesn't kill the supply fast, but there is a noticeable impact if you look at a couple hundred counters over a decade or so. Bob |
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