DROK 4-20mA Generator 2pcs, Adjustable Signal Generator, DC 0-10V 0 4-20mA Current Voltage Analog Simulator for Value Adjusting PLC Panel LED Testing

Excellent product and particularly for its price. I've a 20 year old Altek 334A mA Calibrator. It looks and works exactly that same as a new unit made by Pie. Its quality is significantly better than a DROK. However, I've neither the need for its precision nor for its price. As an OEM Electrical Engineer in the paper, film and foil industries, among other applications, I'm currently using the DROK to calibrate Siemens and Rockwell analog input modules for Rosemount\Harding level sensors, IFM Flow Detectors and Barksdale pressure switches. The only issue I've found with the Drok is that its signal polarity inputs appear to be reverse of that on an Altek. (No big deal) Also, the Altek's internal power source and alligator clip leads are very nice. However, they are not nice enough to support the significant price difference.

With how cheap this is you can't expect something super accurate but for my purposes testing VFDs and other PLC functions its worked great. Very cheap price and very easy to use. Im a commercial HVAC controls tech so often times I've needed to troubleshoot/test things off VDC/ma signals on the roof of buildings to verify faults as well as bench testing for controls programs. For the price you really can't beat what this thing does and if it gets damaged/broken its cheap enough to replace with no issue.

This simulator is a great tool to troubleshoot open pressure sensors on the engines I wirk on. Though it's small, it does work well enough to find the fault in a circuit. The case for the meter is somwhat fragile, so I recommend making a bubble wrap pocket for storage while not using the device. The meter did not come with test leads, so a lead kit may set you back some additional SSS. Inexpensive, but still no leads. I have a Fluke lead kit that works well enough.

This is a nice tool, and inexpensive. It can be powered by a 24VDC power supply, or I used 2 9V batteries in series. There is one terminal for V-Out, one for I-Out, and one for A- Com. If you do not know what any of these terms mean, this is not the device for you.There are capabilities to edit patameter set for both current and voltage. Another reviewer posted snip of settings and procedure. I used these to get I-Out from a 4-20mA down to a 0-20mA output.Relatively small device, great for portability. Approximately 4" x 2" x 2"I will probably locate a hard case and line it with foam pad to store device.

Works as described and verified accurate with a fluke 87 meter

So far this unit has performed very well. I checked the accuracy right out of the box with my Fluke 87 and it was right on! It does have a way to adjust both the voltage and milliamp output on the back of the board. I also put 2 - 9 volt batteries in series for the power supply and they fit inside the box. The PC board also has a pin out for a power switch which I added to turn off when not in use. I have used it for a week now, I experiment with vfd’s and other analog control devices and then put together installation and programming instructions. This is as good as any signal generator out there!

Accuracy is poor. Not useful for simulating PLC analog input current/voltage because accuracy is poor. There are potentiometers on the underside but no adjustment for zero or span. The main adjustment potentiometer runs 0 to 10V (or 20mA) with fine resolution, but there is drift and at max (10V or 20mA) it jumps back down to 9.45V. Disappointing quality of output accuracy (build is okay).

I needed to prove something at work. I had a rudimentary PLC that sends a 4 to 40ma signal. It used a potentiometer to measure fuel level, and the 4 to 20ma signal output is proportional to that input. I had an unused Analog input on a Caterpillar 4.2 panel. The panel used a 0 to 5Vdc input. Using a 250 ohm resistor, I was able to obtain a volt drop across the resistor in the 1 to 5Vdv range. Using this signal generator, I was able to emulate the PLC's output signal and program a CAT 4.2 panel to read fuel level with a 4 to 20ma signal. I had to prove it on our shop's gen before we could suggest it as an upgrade to any customer's gensets.The device is not accurate when it is shipped. BUT its has trim pots on the backside. These are just to make the display screen read the same as the output. I have not really messed with them, as inacurate display readouts were not something I needed to worry about because I was watching with my Fluke 87V.My needs were satisfied, the output is adjustable, and the price was excellent. If I dabbled more in the world of automation, then I might need something more. But then again, maybe not.

Fácil de usar , económico y ayudamucho en las calibraciuobnes en banco y en campo.

Using a couple of these to simulate analog inputs on a PLC. Works perfectly. Have not tried the 0-10V functionality as 4-20mA is all I ever use. I really like that this device is in a plastic case. Everything feels solid!I do like that this is "hackable" to be used with a battery. I don't need this but it is nice to have the option.Wire this up to an M12 sensor cable and this can be used out in the field to test wiring as well.Good product and a solid buy if you need to simulate some analog sensors for programming.

I needed this to generate a 0-10volt analog control signal to test some ECM motors. It works perfectly. My only comment is that it should state that a 24volt DC input voltage is required. Fortunately the ECM motors I was testing required 24volts to power so I used the same transformer to power the signal generator. The LED display is also very useful and the fine adjustment is as well. A great little device for the price, if you need such a thing.

I use two 9-volt batteries in series to power it. Works well for setting up 4-20ma & 0-10v actuators

It gives accurate signal which helps to use for testing purpose. It could have been marvellous and highly competitive had it have provision for internal battery as a power source.