24V Portable Power Supply for Loop TransmittersTheField Tools 24V Supplyprovides portable power to loop-powered transmitters. It's a fully contained power source that takes the low voltage from three 'AAA' alkaline batteries and increases it to a highly filtered 24 volt power source - perfect for powering loop 4-20mA transmitters. The 24V Supply is easy to use, includes all connection leads, and makes it simple to attach your HART protocol modem to the loop.Using batteries as the power source eliminates isolation concerns as well as the need for a power connection to AC or a USB port. The voltage conversion is done using a high efficiency switching DC-DC converter to maximize battery life - over 6 hours at 12mA.'Quick simple power for transmitter field calibrations and testing.'Connecting is quick and simple. Clip on the two mini-grabber clips to the power input of your transmitter and push the connect button. A single connect/disconnect button enables or disables the 24 volts while a status LED indicates the active operating mode. The 24V Supply automatically powers down if left active to save battery life. If the batteries become low, the status LED will flash while connected to remind you to replace them soon.'connect the two power leads and press a buttonto supply 24 volts to 4-20mA loop transmitters.''To measure loop current plug the test leads into your DC milliamp meter'To measure loop current plug the milliamp meter test leads directly into a standard DC current meter. There's no need to break the loop to attach the meter because internal circuits route the loop current through the meter when it's connected. If the load current exceeds 30mA, or is shorted, the output will quickly disconnect. To restore the output simply remove the excess load or short and press the connect button.Mini-grabber clip points make attaching a HART modem or HART calibrator quick and simple.A 250 ohm loop resistor is included internally so no external connections or jumpers are needed.Using the 24V Supply will simplify your loop transmitter calibrations and testing while eliminating time wasted troubleshooting your calibration setup. Start using the 24V Supply today.FeaturesHighly filtered 24 volt power source for 4-20mA loop transmittersUp to 30mA capacity, perfect for 4-20mA devicesBattery powered - eliminates galvanic isolation concernsIncludes an internal 250 ohm loop resistor to allow for HART protocolHART modem mini-grabber clip points for easy modem connection to the loopAll connection leads included - no need for extra test leads and alligator clipsLong battery life, greater than 6 hours continuous at 12mA loadStatus LED indicates when battery is getting lowAble to maintain output even with weak batteries to maximize battery lifeUses easy to find, low cost, standard "AAA" alkaline batteriesShort circuit protection disconnects the output if shorted or over-current detected (>30mA).