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Loop Calibrator Model 334A

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Product Description

General description

Easy to use

The Altek Model 334A will check, calibrate andmeasure all your current signal instruments in a 4 to20 milliamp DC loop. Use at every point in your loop.Source & Read 0.00 to 24.00 mA, Simulate a 2-wiretransmitter or use the Model 334A to simultaneouslypower & measure your 2-wire transmitters. Toggle thedisplay to show milliamps or percent of 4 to 20.

Source milliamps

Calibrate recorders, digital indicators, stroke valves orany other instruments that get their input from a 4 to20 mA loop. Easily set any value to within 0.01 mAwith the speed sensitive digital potentiometer.

Recall output setting

The “Quik-Chek” switch provides rapid checking of4.00, 20.00 and a third point between 0.00 to 24.00mA.

Calibrate using loop power

Check loop wiring and receivers by using the Model334A in place of a 2-wire transmitter. Simulate achanging process input to check loop response andcontrol settings. The Model 334A uses any loop powerfrom 3 to 45V DC.

Read loop current

Check controller outputs or measure the milliampsignal anywhere in the loop. The Model 334Ameasures 0.00 to 24.00 mA signals with much greateraccuracy than a typical multimeter. Toggle the displayto show milliamps or percent of 4 to 20.

Power and measure 2-wire transmitters

Simultaneously measure the output of a 2-wiretransmitter while using the internal batteries to supplyup to 27V DC to power the transmitter. Handy forchecking transmitters in the field or on the bench.

Read DC Volts

Measure from -99.99 to +99.99 VDC with 10mVresolution. Use it to check loop power supplies, I/Vconverters, 1 to 5 Volt signals and battery voltages.


• All milliamp loop functionsSource milliampsSimulate two-wire transmittersRead milliamp outputsPower & measure two-wire transmittersRead DC Volts to check power supplies

• Compact and lightweightEasy to carry – less than a poundIncludes padded nylon carrying case withshoulder strap and belt loop

• Accuracy to ±0.03%Within ±0.02 mA from 4 to 20 mA

• Long lasting alkaline batteriesThree “9V” batteries last many shiftsOptional AC adaptor for bench use

• “Quik-Chek®” SwitchInstantly output 4.00 and 20.00 mA

• Milliamp or % displaySource or Read from 0.00 to 24.00 mA orfrom -25.0 to +125.0% of 4 to 20 mA

• Overload protectedWithstands 135 Volts AC/DC without fuses

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