Edge is pretty good
Compared to IE6, yes.
Does anyone woant to bid for these beauties:
https://www.ebay-kleinanzeigen.de/s-anzeige/lot-148-hewlett-packard-4x-digital-multimeter/1708232302-168-4196
https://www.ebay-kleinanzeigen.de/s-anzeige/lot-152-hewlett-packard-digital-multimeter/1708415090-168-4196
https://www.ebay-kleinanzeigen.de/s-anzeige/lot-141-keithley-3x-geraete-multimeter-source-und-lcz-meter/1708205500-168-4196
If we make a group buy, I'm in !!!
The auction house has A LOT of cool stuff, but I was never able to properly do it and instruct a courier fro pick-up, maybe Mr. IceTea can give some advice.
Cheers,
DC1MC
Does anyone woant to bid for these beauties:
https://www.ebay-kleinanzeigen.de/s-anzeige/lot-148-hewlett-packard-4x-digital-multimeter/1708232302-168-4196
https://www.ebay-kleinanzeigen.de/s-anzeige/lot-152-hewlett-packard-digital-multimeter/1708415090-168-4196
https://www.ebay-kleinanzeigen.de/s-anzeige/lot-141-keithley-3x-geraete-multimeter-source-und-lcz-meter/1708205500-168-4196
If we make a group buy, I'm in !!!
The auction house has A LOT of cool stuff, but I was never able to properly do it and instruct a courier fro pick-up, maybe Mr. IceTea can give some advice.
Cheers,
DC1MC
Sorry, please do not misunderstand, but we've discussed this lot and this seller on discord one or two weeks ago.
If they are working and saturated, they will be so fragile they won't survive shipping (fragile glass envelope, and fragile crystals in the electrode[1]). OTOH if they are unsaturated, they won't be in spec any longer.
Yes, I can't imagine them surviving any normal shipping. The listing gives no condition classification, so I suspect they are indeed no longer saturated, and are no more than a curiosity, realistically.
https://www.ebay.co.uk/itm/Standard-Cell-Weston-Normal-Cell-1-Volt/313488809914
Sorry, please do not misunderstand, but we've discussed this lot and this seller on discord one or two weeks ago.
So, what was the result, like (most) of other auction houses, is crappy, wasn't just my bad luck with them ?!?!
========== STM32F411 starting. ==========
Git hash: e2055dfa37582e14a92371c358e003e9395c6991
Creating blinky.
Initialising SPI1 ...done.
Setting DAC for OCXO MIN f calibration.
MIN frequency = 9999987.000000000
Setting DAC for OCXO MAX f calibration.
MAX frequency = 10000016.000000000
OCXO EFI gain = 7.160763740 Hz/Volt, 0.007114774 Hz/DAC step
Setting DAC to initial trial set point.
DAC set to 2000 (2.0163V).
frequency = 10000000.00Hz, error = 0.3100Hz, DAC correction = -43, new DAC value = 1957 (1.9736V)
frequency = 10000000.00Hz, error = -0.0460Hz, DAC correction = 6, new DAC value = 1963 (1.9795V)
frequency = 10000000.00Hz, error = 0.0030Hz, DAC correction = 0, new DAC value = 1963 (1.9795V)
frequency = 10000000.00Hz, error = 0.0109Hz, DAC correction = -1, new DAC value = 1962 (1.9785V)
frequency = 10000000.00Hz, error = 0.0099Hz, DAC correction = -1, new DAC value = 1961 (1.9776V)
frequency = 10000000.00Hz, error = -0.0010Hz, DAC correction = 0, new DAC value = 1961 (1.9776V)
frequency = 10000000.00Hz, error = 0.0049Hz, DAC correction = 0, new DAC value = 1961 (1.9776V)
frequency = 10000000.00Hz, error = 0.0060Hz, DAC correction = 0, new DAC value = 1961 (1.9776V)
frequency = 10000000.00Hz, error = 0.0120Hz, DAC correction = -1, new DAC value = 1960 (1.9766V)
frequency = 10000000.00Hz, error = 0.0099Hz, DAC correction = -1, new DAC value = 1959 (1.9756V)
frequency = 10000000.00Hz, error = 0.0049Hz, DAC correction = 0, new DAC value = 1959 (1.9756V)
frequency = 10000000.00Hz, error = 0.0010Hz, DAC correction = 0, new DAC value = 1959 (1.9756V)
frequency = 10000000.00Hz, error = 0.0040Hz, DAC correction = 0, new DAC value = 1959 (1.9756V)
frequency = 10000000.00Hz, error = 0.0030Hz, DAC correction = 0, new DAC value = 1959 (1.9756V)
frequency = 10000000.00Hz, error = 0.0020Hz, DAC correction = 0, new DAC value = 1959 (1.9756V)
frequency = 10000000.00Hz, error = 0.0010Hz, DAC correction = 0, new DAC value = 1959 (1.9756V)
frequency = 10000000.00Hz, error = 0.0049Hz, DAC correction = 0, new DAC value = 1959 (1.9756V)
frequency = 10000000.00Hz, error = 0.0099Hz, DAC correction = -1, new DAC value = 1958 (1.9746V)
frequency = 10000000.00Hz, error = 0.0030Hz, DAC correction = 0, new DAC value = 1958 (1.9746V)
frequency = 10000000.00Hz, error = 0.0049Hz, DAC correction = 0, new DAC value = 1958 (1.9746V)
frequency = 10000000.00Hz, error = 0.0049Hz, DAC correction = 0, new DAC value = 1958 (1.9746V)
frequency = 10000000.00Hz, error = 0.0049Hz, DAC correction = 0, new DAC value = 1958 (1.9746V)
frequency = 10000000.00Hz, error = -0.0069Hz, DAC correction = 0, new DAC value = 1958 (1.9746V)
frequency = 10000000.00Hz, error = -0.0010Hz, DAC correction = 0, new DAC value = 1958 (1.9746V)
frequency = 10000000.00Hz, error = -0.0030Hz, DAC correction = 0, new DAC value = 1958 (1.9746V)
If they are working and saturated, they will be so fragile they won't survive shipping (fragile glass envelope, and fragile crystals in the electrode[1]). OTOH if they are unsaturated, they won't be in spec any longer.
Yes, I can't imagine them surviving any normal shipping. The listing gives no condition classification, so I suspect they are indeed no longer saturated, and are no more than a curiosity, realistically.
https://www.ebay.co.uk/itm/Standard-Cell-Weston-Normal-Cell-1-Volt/313488809914
I guessed that might be the listing
I would bet on that being saturated since the temperature is mentioned, there are two in the container, there is a hole for a thermometer to measure the temperature, and the voltage is right.
Yes PSU ripple had crossed my mind however the main amp PSU seems to be working fine as it's still driving the 5 speakers without hum or noticeable distortion and able to blast us out of a 4 car garage when Pink Floyd get played and you crank it right up !
So check how the lower voltage auxiliary supplies are generated. Might be a separate winding (with failed bridge rectifier) or some nasty dropper resistors from main amp voltage causing local hot spots on the PCB and nearby components failing ...Yep all simple stuff you would normally spot with a little experience....spose I should go looking for a SM....oh hang on I've already got one on my Manual folder !
Myself, I'd search out which relay(s) is/are rattling first. May not even be in the protection circuit; some of the older models used relays in the input switching and/or had relays that provided impedance matching or put the speakers in series if you switched in an additional pair of speakers on the B channel.
mnem
Yokogawa DL1200A
Okay, as promised and even though it is getting late here (01:22 MEST),
here is the teardown and a little testing of the Yokogawa DL1200A.
First of all: I'm impressed. Why? Well, because of this:
This is the box. Looking suspiciously small and I'm fearing the worst.
Let's open the box and yes: no additional packaging material. Zero! None!
[snip...]
But is it working?
Let's find out.
First boot and CH1 and CH2. Looks good! This thing has survived the trip from Munich to me without any damage so far!
Very impressive!
The display is very crisp and all the functions seems to work!
I've connected my R&S dual arb generator (type: ADS) to the scope and fooled around a little bit.
Signals are sine and triangle, 1kHz, 2Vpp. Sorry for the blurred pictures,
sometimes the cam did not focus on the display and I was too lazy to take new pictures.
I hope you've enjoyed this little teardown and testing.
I think, I've fallen in love with those Yokogawa scopes. Cute things, a bit unusual in their handling but not illogical.
But now it's bedtime, really tired at 02:14 MEST here ...
Be there soon. Hoovering. Well I’m not I’m posting this but should be hoovering.
Yes PSU ripple had crossed my mind however the main amp PSU seems to be working fine as it's still driving the 5 speakers without hum or noticeable distortion and able to blast us out of a 4 car garage when Pink Floyd get played and you crank it right up !
So check how the lower voltage auxiliary supplies are generated. Might be a separate winding (with failed bridge rectifier) or some nasty dropper resistors from main amp voltage causing local hot spots on the PCB and nearby components failing ...Yep all simple stuff you would normally spot with a little experience....spose I should go looking for a SM....oh hang on I've already got one on my Manual folder !
Myself, I'd search out which relay(s) is/are rattling first. May not even be in the protection circuit; some of the older models used relays in the input switching and/or had relays that provided impedance matching or put the speakers in series if you switched in an additional pair of speakers on the B channel.
mnem
A, B and Rear all working fine and I think Robert might be correct in that the rattler is an AV input but not showing on the display.
Bad Driver seems to know these units well so will roll with what he's offered.
Discord !
hp 437B calibration reference
The calibration depends on the internal power reference being accurate. The reference frequency is well inside the 50 MHz +/- 500 kHz tolerance. The service manual specifically states that anywhere inside that window "no adjustment is necessary".
I can't perform the hp power calibration procedure because I don't have another calibrated power meter of similiar accuracy as it requires.
The power spec is 1.0 mW +/- 0.7%. This would be
0.7% of 1.0 mW = 0.007 mW
So we have between 1.007 mW and 0.993 mW, or between +0.0303 and -0.0305 dBm
I checked the output power level with a Rigol DSA815 and I measured -0.09 dBm (averaging). However, it isn't accurate enough to calibrate the output power (refer to the specifications of the DSA-815, < 1.5 dB uncertainty).
I have an Agilent 8648A signal generator that I could reference the Rigol to, but it has a tolerance of +/- 1.0 dBm output. So again, I can't use it to make any judgments. Therefore, I will leave well enough alone, because the output power may very well be within tolerance. It certainly isn't "wildly" off.
Note: Come to think of it, the 437B meter only sells for $37 ... if I had another one to compare to ...
This is not a bad deal if you need a quality RTD as a reference eBay auction: #333827379223 If you are looking to pair it with non Fluke just check out the Ro first or you will need to apply a fudge to the results when you get to uber accuracy.