Products > Test Equipment
Keysight New instruments
wizard69:
--- Quote from: Berni on March 01, 2021, 06:46:15 pm ---
--- Quote from: CJay on March 01, 2021, 05:55:23 pm ---
--- Quote from: bd139 on March 01, 2021, 05:52:33 pm ---The estate version looks like it'd be doing a wheelie all the way home from a hamfest.
--- End quote ---
Nah, they have a *huge* engine in the front as a counterwieght for the valuables.
--- End quote ---
Still don't underestimate the weight of old dinosaur test gear and giant RF amplifiers with real iron transformers.
--- End quote ---
This brings back memories. About 40 Years ago I had started work in industrial automation (actually still a young kid). One of the old techs said he need my help moving an RF amplifier. This shocked me because the guy was huge, a cross between a biker and a weight lifter, well over 6 feet tall. That RF amplifier didn't look that heavy when I first saw it, but after a bit of a two man struggle we got it into position. I was shocked that so much weight could be inside an electronics enclosure.
The other funny thing here was back when I was taking tech classes I asked about tubes. The instructor said I didn't have to worry about that old tech. Hardly two years later I'm moving an RF amp around with the biggest tube I'd ever seen up to that time.
In any event a little off topic, but it does highlight how technology has changed.
wizard69:
I'm looking or really waiting for, affordable electric cars. Well trucks or vans are actually my cup of tea. Tesla with their pickup is getting there. I actually like some the speculation floating about the net for a van covered in solar cells. The idea of retirement is not far away and a van to explore the world has some appeal.
As for the Aston Martin, do people really by those ugly cars?
--- Quote from: floobydust on March 01, 2021, 08:23:42 pm ---
--- Quote from: EEVblog on March 01, 2021, 06:16:44 am ---
--- Quote from: floobydust on February 28, 2021, 10:41:08 pm ---We know nothing of the price point for these new Keysight instruments? The playing field has a lot of competition now.
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Go a few pages back, prices and user manuals posted.
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Sorry I was distracted at the wheel. To recap the list prices of these new instruments:
EDU33212A Dual Channel Function Generator; USD $915
EDU36311A DC Power Supply; USD $838
EDU34450A Digital Multimeter; USD $696
EDUX1052G Dual Channel Oscilloscope; USD $722
New Aston Martin Lagonda planned production this year...
The old one nice in green, pop up headlights and all digital dash, flat switches. I actually like it when designers can go futuristic - have fun, create/innovate, think outside the corporate box. Steve Jobs did it as well.
Yes it has some non-chicken dinner aspects but these ventures nonetheless are a step forward.
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Berni:
--- Quote from: floobydust on March 02, 2021, 06:27:23 pm ---Deal-breaker on the EDU36311A PSU is the danger when charging a battery. It appears there is an OVP crowbar that trips if the PSU is connected to a battery and power is switched off. When power is switched off, the reference drops and the OVP wrongly thinks O/P voltage is too high, OVP activates and sadness results, as the user manual mentions.
So you must use a series diode to charge batteries. What a hassle and loss of precise charging voltage.
Some techs first switch off a PSU, then disconnect the leads. This is bad if there is a battery or load with huge capacitance connected, the backfeed can kill a pass-transistor and control circuitry.
--- End quote ---
That is a pretty silly design decision in that case. I charge batteries with lab PSUs all the time and none of them gave a toss about having voltage fed back into them even when disabled. Tho connecting a battery across a lab PSU in reverse will do damage, but that case is just user stupidity and a PSU should not be expected to cope with.
But perhaps this works more like the current sinking capable rack mount PSUs that HP/Agilent/Keysight makes. That functionality is a bit of a trap for young players because it is not clearly started on the list of features and its rare for a PSU to do this. Most PSUs will let you drive its output above the set voltage by hooking up a higher voltage source to the output, but some of these rack mount PSU models actually start to fight you back and actively sink current to bring it back down to whatever is set. For something like a Agilent 66332A (Dynamic Measurement DC Source) that is designed for 2 quadrant operation this sinking current is the same as the current limit set on the front panel (this makes it a nice electronic load or battery simulator) while some of the other PSUs ignore the current limit and always use a sinking current that is equal to the max rated current for that channel. So having a battery connected would just drain the battery some while the PSU is unharmed. But even then i think this current sinking only happens when a channel is actually enabled and set to a lower voltage, i think the terminals just go open circuit if the channel is disabled.
This feature is likely present in the rack mount system PSUs to avoid blowing up a DUT on a production line test jig if a 12V rail shorts to a 3.3V rail or something. So perhaps the people designing this EDU power supply seen that feature and thought this was a neat idea to also help students blow up less cirucits. Yet have not looked closely enough at how it works and implemented it wrong to also sink current in disabled mode or forget to limit the sinking current to protect itself.
Dave should test it out what happens when you backfeed current into this thing from another PSU
HighVoltage:
--- Quote from: floobydust on March 02, 2021, 06:27:23 pm ---Deal-breaker on the EDU36311A PSU is the danger when charging a battery. It appears there is an OVP crowbar that trips if the PSU is connected to a battery and power is switched off. When power is switched off, the reference drops and the OVP wrongly thinks O/P voltage is too high, OVP activates and sadness results, as the user manual mentions.
So you must use a series diode to charge batteries. What a hassle and loss of precise charging voltage.
Some techs first switch off a PSU, then disconnect the leads. This is bad if there is a battery or load with huge capacitance connected, the backfeed can kill a pass-transistor and control circuitry.
--- End quote ---
Many old Agilent and HP PSUs had this "feature" and many years ago I killed a brand new Agilent PSU, by charging a battery and the crow bar was activated.
The magic smoke appeared really fast and dark.
Since that time I am careful, every time I hook up a battery or large capacitor to a PSU.
nctnico:
--- Quote from: HighVoltage on March 03, 2021, 09:10:33 am ---
--- Quote from: floobydust on March 02, 2021, 06:27:23 pm ---Deal-breaker on the EDU36311A PSU is the danger when charging a battery. It appears there is an OVP crowbar that trips if the PSU is connected to a battery and power is switched off. When power is switched off, the reference drops and the OVP wrongly thinks O/P voltage is too high, OVP activates and sadness results, as the user manual mentions.
So you must use a series diode to charge batteries. What a hassle and loss of precise charging voltage.
Some techs first switch off a PSU, then disconnect the leads. This is bad if there is a battery or load with huge capacitance connected, the backfeed can kill a pass-transistor and control circuitry.
--- End quote ---
Many old Agilent and HP PSUs had this "feature" and many years ago I killed a brand new Agilent PSU, by charging a battery and the crow bar was activated.
The magic smoke appeared really fast and dark.
Since that time I am careful, every time I hook up a battery or large capacitor to a PSU.
--- End quote ---
Many years ago I bought a nice HP PSU cheap because the owner had used it to charge a battery. The owner had slowed the fan down so the PSU overheated which also activated the crowbar. In the end the damage was limited to a few burned PCB traces so it was an easy fix. While at it I made the fan temperature controlled.
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