| Products > Test Equipment |
| Keysight New instruments |
| << < (31/52) > >> |
| Bassman59:
--- Quote from: pe1oxp on February 28, 2021, 02:25:55 pm ---I can appreciate the new kind of housing, it saves a lot of space on the workbench (depth). --- End quote --- At home I have a Tek TDS2024. (I bought it new, well before Rilent came out with 2 GHz sampling/200 MHz 'scopes for $500. I think it was really the only option back then!) Despite the limited triggering, low memory depth and small screen, it still works well enough. That it's not very deep is a bonus, I can fit it in tight spots. At the day job I have a DPO3054. It's also not a very deep 'scope so it fits in packed benches. (Sometimes you work away from your usual bench.) My HP1660E logic analyzer takes up much more bench space. Actually, it takes up zero bench space as it's been on the top of a bookshelf for years. I have no need for a logic analyzer any more. --- Quote ---Prices are better for hobby purposes but what when Keysight doesn't sell to private persons anymore... --- End quote --- Here in the Colonies I can buy whatever Keysight product I want, up to the limits of my credit cards! |
| floobydust:
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. |
| SilverSolder:
--- 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 --- Couldn't the pass transistor related control circuitry be designed to cope with this kind of real-world use case? It does seem a bit lame in 2021... this isn't Keysight's first power supply, there is a long and strong ancestry there. |
| 25 CPS:
--- 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 --- I took a look at the manual too and there's no provision for remote sensing either, so the idea of picking off the feedback voltage externally after the protection diode to regain precise voltage control wouldn't work either although if it did, it'd be even more setup overhead on top of the hassle of adding the diode. |
| Kleinstein:
Most lab supplies have a protection diode to protect the output stage from residual charge in a reasonable sized capacitor. So turning the supply off should not directly be a problem. The over voltage protection / crow bar may engage than, but it should be able to absorb quite some energy. The combination of relatively weak (1A) channels and a 5 A 5 V channel could be a problem: the manual says not to wire the 5 V and another channel in series or parallel (as they are different current rating). However for educational use this does not stop the users to do it. Let's hope the build in diode for reverse protection can withstand the 5 A. It could be a bit problematic that all 3 sources in sereis give up to 65 volts - this could be a deal breaker in some areas. |
| Navigation |
| Message Index |
| Next page |
| Previous page |