how long will it run on 2 9 volt batteries?

That will depend very much on the use you make of it; we have used the same batteries for several weeks now, but the use is intermittent and for testing or commissioning only.

Can someone please give a detailed explanation of how to use and generate a signal with this device?

This is used to simulate either a 4-20ma or 0-10vDC signal in a test environment, selectable via on board switch. I have found that depending on the input resistance of your load using 9 volt batteries in series may not have enough capacity so I use a small 24vDC power supply to power the generator. Connect your generator power wires & appropriate output wires observing the correct polarity & you should be fine

I see there is a place on the pc board for an on off switch. can this be added?

Not sure. When power is applied to the terminals, the meter comes alive. Not sure if the printed circuit card pads will turn off the meter, as I do not see any jumper or other means that is completing the circuit. I am just disconnecting the power to turn the meter off.

When providing power to this product, what is the input voltage? does it accept a vdc voltage range?

The input voltage to this device is 24VDC, and have an analog output 0-10Vdc or 0-20mA. Works really good.

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

Product ID: 45049867

⚡0-10V voltage output precision

🔋0/4-20mA current signal range

🎛️Multi-cycle precise potentiometer control

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R$508

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Sold byAmazon BrazilDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🎯 Precision testing, zero guesswork—own your diagnostics game!

PINPOINT ACCURACY - Achieve ultra-fine calibration with 0.1mA and 0.01V display precision for flawless testing.
COMPACT POWERHOUSE - Small footprint (100x68x38mm) fits perfectly in any professional toolkit or lab bench.
DUAL SIGNAL MASTERY - Seamlessly toggle between voltage and current outputs with one compact module.
PRO GRADE DEBUGGING - Ideal for PLC, inverter, panel, and LED testing—engineered for the tech-savvy professional.
PLUG PLAY VERSATILITY - Compatible with 24V DC power or portable 9V battery setups for on-the-go diagnostics.

The DROK 4-20mA Generator is a compact, dual-function signal generator delivering precise 0-10V voltage and 0/4-20mA current outputs. Featuring a multi-cycle potentiometer for fine adjustments and compatibility with 24V DC or battery power, it’s engineered for professional-grade PLC, inverter, panel, and LED testing. Trusted by over 500 users with a 4.2-star rating, it’s the essential tool for accurate, portable electrical diagnostics.

Specifications

ASIN	B071NLGP6L
Best Sellers Rank	#56,375 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #13 in Function Generators
Date First Available	May 1, 2017
Is Discontinued By Manufacturer	No
Item Weight	4.6 ounces
Item model number	300482
Manufacturer	DROK
Package Dimensions	5.2 x 3.66 x 2.68 inches

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TrustScore 4.5 | 7,300+ reviews

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Good experience, but the tracking updates could be better.

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