4-20mA Generator, DROK Adjustable Signal Generator, DC 0-10V 0 4-20mA Current Voltage Analog Simulator for Value Adjusting PLC Panel LED Testing

My mistake was believing the label that said 12-stars. A 24 volt system is required. The supply was a beefy 12 volt one (actually a little over 14 volts), so I connected it in that way. When powered by a nominal 12 volts, the device was no longer functional. Nevertheless, before giving up, I wired two 9 volt batteries together and gave them an 18 volt supply to work with. Yeah, that's exactly what we need. I was able to use it when I provided an 18 volt supply. An inexpensive gadget does not need to be super accurate. It would be useful to be able to put out a variable current in order to test some equipment before a battery is fully charged. You can use a VoltOhmMeter to monitor this with as long as your source of power is adequate. The display isn't 100% accurate, but you can monitor that with this. It may not work as well as you'd like with the calibration pots on the back side of the board, but it is passable if you don't mind them. It does not come with a manual, so you would better know what you want beforehand. Two terminals were connected to the 18 volt battery. There are 2 more terminals, as well as a common terminal. There is one of these, which delivers a constant voltage (relative to the common terminal) up to a little over 10 volts. (*span_start>) The other terminal can deliver a constant current of about 20 mA as compared In this knob, the current or voltage is changed from minimum to maximum by rotating four turns. In plain sight, we see volts, but what we don't see is that the tiny switch is changing the display to milliamperes. This is all that is displayed. In spite of the position of the switch, the knob changes the output simultaneously on the milliamp terminals and the volt terminal. It should have been apparent to me, why didn't it? It's so small and simple, it's surprisingly useful. The price is worth it and then some, but I wouldn't use it on a Mars mission, but I would use it for troubleshooting and testing.

Gracie Stark

| Nov 05, 2020

Right out of the box, I tested the accuracy with my Fluke 87 and it was accurate! This product has an adjustment on the back of the board for both the voltage and milliamp output. I've also put 2 - connectors on the back. In the box are 9 volt batteries arranged in series for the power supply. Added to the PC board is the connection for a power switch, so when the board is not in use, the power will be turned off. The first week I used it, I experimented with VFD's and other analog control devices and then wrote the installation and programming instructions for it. Signal generators do not get any better than this one.

Kiaan Burch

| Mar 24, 2021

But there was another issue. As part of my simulation, I used a scale to represent the signal. In the beginning, it worked as intended. By using my SIMPSON 260, I could see the signal was not quite as precise as I had hoped, but it was A few days later, the signal had deteriorated to the point that it had no further use. In addition to panels, we also offer programming and programming services. As soon as I turned it off, I said that's enough. As it turned out, the primary purpose for which it was purchased was completed. Nevertheless, I do not recommend this product. Too many cheap electronic components cause it to overheat quickly. It is probably one of the lowest It becomes more and more difficult to receive the signal as the unit runs throughout the day. A heat sink is likely to be the source of the problem. I like the build quality of this meter product. I tried it again after leaving it off for a week and found that there was no problem (see two photographs of an output reading on a 4-bar) The scale is 10 mA. The meter is useful, but it should not be relied on exclusively. As a quick back of the envelope check, it is helpful. It can only be operated with a 24 volt DC power supply. It should not be left on if you want it to function properly. You should check it as well.

Amari Henson

| Oct 08, 2020

This is an excellent product, particularly for its price. I have an old Altek 334A mA Calibrator that is 20 years old. As it is similar to a new Pie unit, it also looks and works exactly like it. In comparison to a DROK, it has a much better quality. It has neither the precision nor the price as an OEM Electrical Engineer in the paper, film, and foil industries as well as for calibrating Siemens and Rockwell analog input modules for Rosemount/Harding level sensors, IFM flow detectors, and Barksdale pressure switch. Despite the Drok's seemingly superior sounding features, I have only had one issue with it the polarity of the input signals appears to be reversed. (Not a big deal) Also, Altek is very nice with its internal power source and alligator clips. However, they are not nice enough to justify their significant price differential.

Lara Potts

| Apr 03, 2021

The accuracy of these is adequate for 99 based on my Fluke 289v. We will look at 9% of the capabilities anyone using analog control v/i sources will Despite this, do not expect to drive high current analog devices with this. That being said, I do not have an issue driving loads up to 100 mA which is pretty standard. In comparison with most analog sources, the price of this thing is relatively low. It is not a bad device to have in your box if you are learning analog control on plc's or you are a maintenance technician. Construction of the unit can be a bit lacking, but at this price point, it is hard to complain. It took a little alcohol to clean some of the solder joints and some olive oil to get things nice and shiny The pcb was strengthened where the screw holes were by placing rings under the pcb to prevent it from flexing when the screws were tightened. When you consider the Dac's price is almost half the cost of the entire device, this is a tough competition.

Muhammad Garner

| Oct 21, 2020

The work I do requires me to prove a certain point. A simple PLC was making it possible to send signals of 4 to 40ma. In addition to a potentiometer to measure fuel level, the output signal varies from 4 to 20 mA proportionally to the On a Caterpillar 4, there was an unused Analog input. A panel of two panels. An input of 0 to 5V dc was used for this panel. With a 250 ohm resistor, I became able to measure a voltage drop across the resistor within the range of 1 to 5V. By emulating the PLC output signal with this signal generator, I was able to program a CAT 4 to read the output signal. The fuel level is read by panel 2 with a signal between 4 and 20 mA. Before I could recommend it to any of our customers, I had to prove it on our shop's generation set. Devices shipped from the manufacturer are not accurate when they arrive at their destination. On the backside, the display screen is marked with trim pots, which are just for making the display read like It wasn't truly a concern for me, as I was doing all of my measurement with the Fluke 87V, so inaccuracy of the display readouts wasn't a problem. I was satisfied with the results, I am able to adjust the output, and the prices were reasonable. It may be necessary to add something more if I delved deeper into the world of automation. However, this may not be true as well.

Drew Farley

| Oct 10, 2020