Altek 334A Process Loop Calibrator

All 4 to 20 mA Loop Functions
Source 0.00 to 24.00 mA or -25.0 to 125.0% read mA or percent to 52.00 mA, simulate 2-wire transmitters, measure -99.99 to 99.99 volts DC power & read 2-wire transmitters.

Quik-Check Switch
Select 4 or 20 mA output or 2-wire simulation. Accurate to ±0.006 mA.

Full Range 10 Microamp Resolution
Adjust 4 digit display to ±0.05% without range change.

Long Battery Life
3x9 volt alkaline batteries source 20 mA for over 20 hours, 12 mA for over 33 hours; 2-wire simulate and read for 150 hours. Much longer than NiCd batteries or calibrators with a single 9 V battery!

Drive Capability
1200 Ohms with current limited, fuseless protection to 135 V AC/DC.

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

Calibrate recorders, digital indicators, stroke valves or any other instruments that get their input from a 4 to 20 mA loop. Easily set any value to within 0.01 mA with the speed sensitive digital potentiometer.

The "Quik-Chek" switch provides rapid checking of 4.00, 20.00 and a third point between 0.00 to 24.00 mA.

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

Check controller outputs or measure the milliamp signal anywhere in the loop. The Model 334A measures 0.00 to 24.00 mA signals with much greater accuracy than a typical multimeter. Toggle the display to show milliamps or percent of 4 to 20.

Simultaneously measure the output of a 2-wire transmitter while using the internal batteries to supply up to 27V DC to power the transmitter. Handy for checking transmitters in the field or on the bench.

Measure from -99.99 to 99.99 VDC with 10mV resolution. Use it to check loop power supplies, I/V converters, 1 to 5 Volt signals and battery voltages.