Car batteries need to be repeatedly disconnected and reconnected, e.g. during service or repair. This involves the risk of connecting the battery with reversed polarity, which may lead to damage in the components and circuitry connected. Therefore, as part of the qualification test, every electronic circuit must pass a reverse voltage test. An electronic module like an ECU or a lighting control unit must be connected to a negative voltage for a time of at least 60 s. After the test, the module must not show any damage due to the applied reverse voltage. The test requires a power supply that can operate in quadrants I and III to supply the electronic module with power and to apply a negative voltage and current. Furthermore, suitable pass/fail criteria are needed to validate the electronic module.
A good approach is to accurately measure the supply voltage and current to determine if the electronic circuit is still undamaged after the negative voltage has been removed. Measuring the voltage and current with high precision before, during and after the test is a very simple way to detect a malfunction of, or damage to, an electronic circuit. Complex functional testing of the electronic module is not necessary. Furthermore, the application should be capable of automated testing especially when used in production environments.
Power supply module tested
The R&SNGU401 source measure unit is ideal to perform standard compliant reverse voltage tests since it can operate in quadrants I and III. It can power the electronic module during normal operation, apply a negative voltage and current for at least 60 s, and return to normal operation when positive voltage is back. The test sequence can be defined e.g. by using the internal arbitrary generator, or programmed externally and applied via remote control.
Eaton Cutler Hammer PRTAAPM Auxiliary Power Module is an auxiliary power supply module for Digitrip Trip Units when testing Digitrip Trip Units, either an auxiliary power supply module will be required, or the power/relay module must be energized through its breaker secondary terminals. Used in conjunction with the Eaton Cutler Hammer 140D481G03 Secondary Injection Test Set
With a Power Analysis Application Module installed on an oscilloscope, an embedded designer who rarely deals with power measurements can quickly get the same accurate, repeatable results as a power supply expert.
With the DPO4PWR Power Analysis Application Module installed on an MDO4000 Series oscilloscope, or an MDO3PWR Power Analysis Application Module installed on an MDO3000 Series oscilloscope, an embedded designer who rarely deals with power measurements can quickly get the same accurate, repeatable results as a power supply expert. A Power Analysis Application Module with an oscilloscope and differential voltage and current probes form a complete measurement system for power supply design and test.
The ultimate goal of a DC-output power supply is to transform input power into one or more DC-output voltages. Especially for switching power supplies, the output measurements are essential. These measurements include line ripple, switching ripple, and modulation analysis.
The quality of a power supply's DC output should be clean with minimal noise and ripple. Line ripple measures the amount of AC-output signal related to the input line frequency. Switching ripple measures the amount of AC signal related to the switching frequency.
The DPS5020 is a constant voltage/current programmable control power supply module, that integrates analog and digital control in one device. Th e module is a 0-50V/0-20A Lab PSU module that comes in 2 parts, the main controller and a front panel. The main board has connections for input/output voltage as well as connection headers for Bluetooth and USB to Serial converter.
The front panel module has buttons and a control knob to set the desired voltage/current and an OLED display to show actual readings and set points. The DPS5020 can store up to 10 preset group values which are preserved during power off. You can also quickly set two stored group values. In comparison with traditional analog power supplies, it is more convenient to quickly set the voltage or current required. Using the provided instructions, assembling and switching on the device is straight forward. Along with the package, you will receive a small user manual, cables, and the two main modules.
We tested the module by connecting 12Vdc input and a small DC fan on the output. We set the voltage to 10Vdc and current limit to 1A. As you can see output voltage is off by only a few mV for this low power load.
You can use any 6-60V power supply with output current more than the desired current and below the max limit. A suitable one would be: -To-DC-48V-20A-1000W-Switch-Power-Supply-Driver-Transformer-Adapter-p-1264650.html but this goes up to 48V.
Then I needed to check out some laser diodes and I set it up at 5.7 volts, the forward voltage of the diode and 4.5 amps which is what the driver would usually be set at. However, the buck controller would not deliver more than 1.22 amps! I have no idea what went wrong with it. It is unusable. (I have an adequate power supply for it. I tried several with the same result.)
Testing methodology uses the same Keysight E36103A programmable power supply, B&K Precision Model 8600 DC Electronic Load and 4-wire sensing based breadboard set-up as used in the test of the Canton-Power module. The Panasonic 1000uF electrolytic capacitor to provide local input power decoupling is visible to the right.
2a) Onstate 116: MP2307 mini synchronous DC buck converter module power supply testing/review =xrjHnwlIPy4&t=293s2b) Onstate 117: Modified, stable MP2307 mini synchronous DC buck converter module testing. =BiRxg3cJC7g
The price was not much different from LM2596, at least where I live, and I had bought this MINI-360 only because the space was limited. But with 0.4W idle power usage (which is the same when an ESP-01s is running on an LM2596 converter), I see no point of using this instead of a cheap/small linear regulator, as the author says. If space is not limited, I will just use the common LM2596 module.
Check the output of the show env power detail command and research the power supply status. In this example output, both chords are connected but the second shows only 1200W capacity instead of 3000W and it needs to be for the 220V AC on the N7K-AC-6.0KW. The power source tested OK. Replace the power supply.
On a supply with both inputs active, when an input is disconnected, reconnected, and disconnected again within 1.5 seconds the supply can latch an under-voltage fault and NX-OS can flag the power supply as failed. In another variation, on a supply with two inputs, remove one input and wait 20 to 30 seconds. The supply might intermittently set the Internal Fault alarm and NX-OS reports the power supply as failed.
Cisco bug ID CSCty78612 makes changes to the firmware on the PSU. Software has been enhanced through Cisco bug ID CSCuc86262 which recovers from false fail/shut notifications with the correction of the false bits if the power supply in runtime operates normally. NX-OS Versions 5.2(9), 6.1(3), 6.2(2) and later have the enhancement present which avoids an RMA.
Dual programmable power supplies are capable of supplying up to 60 Watts of power. These are ideal solution for applications where a self contained test system with a high power supply power capability is required in a PXI format.
The DPS32A module is used to supply power to the device that is being tested.It is equipped with 32 channels. Each channel can supply a maximum current of 1A.A system that takes less space can be configured when used in combination with T2000 AiR.
The DPS90A module is used to supply power to the device that is being tested.It is equipped with the 2A_Function and 0.8A_Function, which can supply a maximum current of 2A and 0.8A per channel, respectively.
The DPS192A module is used to supply power to the device that is being tested.It is equipped with the 3A_function, 2A_function, and 1A_function, which have different maximum current supply capabilities, making it possible to supply power more efficiently to the device that is being tested.
The DPS150AE module is used to supply power to the device that is being tested.It is equipped with the HC_Function and LC_Function, which can supply a maximum current of 16A and 2.66A per channel, respectively.Parallel operation makes it possible to supply current at 1000A and higher.
The Multi Function Floating High Power (MFHPE) module is a multi-function power mixed signal module that has 18 channels of floating VI resources. It can be used as a device power supply or load resource based on the pulse and static conditions. By connecting multiple channels in series or in parallel, the requirements for higher voltage and higher current capacity can be fulfilled. In addition, each VI resource is equipped with an arbitrary waveform generator (AWG), which is used for modulation in the voltage or current mode and a digitizer (DGT), which is used for the simultaneous measurement of voltage and current. It also enables time measurement per channel from various resources.
The adapter has a 24-pin female header that mates with the nRF24L01+ module. These pins mirror the connections made on the 16 header and 12 power header. Be sure to observe proper orientation when inserting the module into the adapter. The module extends off the end of the adapter and not over it.
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