Altek 334A User Manual

Loop Calibrator
Model 334A
• All milliamp loop functions
Source milliamps
Simulate two-wire transmitters
Read milliamp outputs
Power & measure two-wire transmitters
Read DC Volts to check power supplies
• Compact and lightweight
Easy to carry – less than a pound
Includes padded nylon carrying case with
shoulder strap and belt loop
• Accuracy to ±0.03%
Within ±0.02 mA from 4 to 20 mA
• Long lasting alkaline batteries
Three “9V” batteries last many shifts
Optional AC adaptor for bench use
• “Quik-Chek
®
” Switch
Instantly output 4.00 and 20.00 mA
• Milliamp or % display
Source or Read from 0.00 to 24.00 mA or
from -25.0 to +125.0% of 4 to 20 mA
• Overload protected
Withstands 135 Volts AC/DC without fuses
Easy to use
The Altek Model 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.
Source milliamps
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.
Recall output setting
The “Quik-Chek” switch provides rapid checking of
4.00, 20.00 and a third point between 0.00 to 24.00
mA.
Calibrate using loop power
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.
Read loop current
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.
Power and measure 2-wire transmitters
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.
Read DC Volts
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.
General description

Altek 334A Specifications

General

Brand	Altek
Model	334A
Category	Test Equipment
Language	English

Summary

General Description of Altek Loop Calibrator 334A

Ease of Use and Core Functions

Details the Model 334A's user-friendly interface for checking, calibrating, and measuring current signal instruments.

Source Milliamps Operation

Explains how to calibrate instruments receiving input from a 4 to 20 mA loop using the device's sourcing capability.

Quik-Chek Switch for Output Recall

Describes the 'Quik-Chek' switch for rapid checking of predefined mA output points like 4.00 and 20.00 mA.

Calibrating with Loop Power

Covers simulating a 2-wire transmitter using the Model 334A with external loop power from 3 to 45V DC.

Reading Loop Current Accurately

Details measuring milliamp signals within a loop with high accuracy, showing milliamps or percent of 4 to 20 mA.

Power and Measure 2-Wire Transmitters

Explains simultaneously powering a 2-wire transmitter and measuring its output using internal batteries.

Reading DC Volts

Details measuring DC voltages for power supplies, signals, and battery voltages with 10mV resolution.

Operating Instructions and Procedures

Device Turn-on and Mode Selection

Instructions for powering on the device, selecting mA or % display, and choosing SOURCE, READ, or SIMULATOR modes.

Battery Replacement

Guide on how to identify low battery indication and replace the three '9V' batteries.

Handling Out of Range and Open Loops

Explains how the device indicates signals outside normal range or open loops and troubleshooting steps.

Using the Calibrator in Process Control

Describes using the Model 334A as a temporary manual loading station for critical control loops.

Sourcing Milliamps and Simulating 2-Wire Transmitters

Detailed steps for sourcing milliamp outputs and simulating 2-wire transmitters using the device.

Reading Milliamps and DC Volts

Instructions for measuring milliamp signals within a loop and reading DC voltage across components.

Setting Up Valves with the Calibrator

Step-by-step guide for setting valve end stops by correctly supplying 4 to 20 mA control signals.

Detailed Operating Procedures

Sourcing Milliamps Output

Detailed steps for providing an output from 0.00 to 24.00 milliamps, including connections and knob adjustment.

Reading Milliamp Outputs

Detailed steps for measuring signals from 0.00 to +52.00 milliamps or -25.0 to 300.0% of span.

Simulating 2-Wire Transmitters

Detailed steps for simulating a 2-wire transmitter output from 0.00 to 24.00 mA in loops with external power.

Powering and Measuring 2-Wire Transmitters

Detailed steps for simultaneously supplying power and displaying the 4-20 mA output of a 2-wire transmitter.

Reading DC Volts Measurement

Detailed steps for measuring DC voltages from -99.99 to +99.99V DC by connecting leads across the voltage.

Altek Loop Calibrator 334A Specifications and Warranty

General Specifications

Provides general specifications including accuracy, warm-up time, temperature effects, and battery life.

Milliamp Source Specifications

Details ranges, accuracy, drive capability, and compliance voltage for milliamp sourcing.

2-Wire Transmitter Power and Measurement Specs

Lists ranges, accuracy, drive capability, and compliance voltage for powering and measuring 2-wire transmitters.

2-Wire Transmitter Simulator Specifications

Covers ranges, accuracy, loop voltage limits, and overload protection for simulating 2-wire transmitters.

Milliamp Read Specifications

Details ranges, accuracy, and voltage burden for reading milliamp signals.

DC Volts Read Specifications

Specifies the range and input impedance for reading DC voltages.

Product Warranty Information

Outlines the warranty terms, duration, and conditions for Altek products.