LC100 Loop Calibrator
Table of Contents 1. Introduction 1.1 Customer Service 1.2 Unpacking . . . . . 1.3 Safety Information 2. Nomenclature . . . . . . . . . . . . . . . . . . . .1 . . . . . . . . . . . . . . . .2 . . . . . . . . . . . . . . . .2 . . . . . . . . . . . . . . . .5 3. Getting Started A. Battery Save Feature . . . . . . . . . . . . . .6 B. HART™ Resistor Setup . . . . . . . . . . . . .6 4. Basic Operating Modes A. Milliamp Source . . . . . . . . . . . . . . . . . .8 B. Milliamp Simulation . . . . . . . . . . . .
LC100 1. Introduction The Martel LC100 is designed to be a complete 4 to 20mA current calibrator for both troubleshooting and calibrating current loops. Very high accuracy combined with several unique features makes the LC100 an easy to use and highly flexible calibration tool. The LC100 can source, simulate (2-wire) or measure loop currents up to 24mA. It can also measure process signal voltages up to 28VDC with the same 0.015% of reading accuracy.
1.2 Unpacking Remove the packing list and verify that all equipment has been received. If there are any questions about the shipment please call Martel Electronics at 1-800-821-0023. When the shipment is received inspect the container and equipment for any signs of damage. Note any evidence of rough handling in transit. Immediately report any damage to the shipping agent. NOTE: The carrier will not honor any claims unless all shipping material is saved for their examination.
Double Insulated Electric Shock Fuse PE Ground Hot Surface (Burn Hazard) Read the User’s Manual (Important Information) Off On Canadian Standards Association The following definitions apply to the terms “Warning” and “Caution”. • “Warning” identifies conditions and actions that may pose hazards to the user. • “Caution” identifies conditions and actions that may damage the instrument being used. Use the calibrator only as specified in this manual, otherwise injury and damage to the calibrator may occur.
Warning To avoid possible electric shock or personal injury: • Do not apply more than the rated voltage. See specifications for supported ranges. • Follow all equipment safety procedures. • Do not use the calibrator if it is damaged. Before you use the calibrator, inspect the case. Look for cracks or missing plastic. Pay particular attention to the insulation surrounding the connectors. • Select the proper function and range for your measurement.
Caution To avoid possible damage to calibrator or to equipment under test: • Use the proper jacks, function, and range for your measurement or sourcing application. 2.
3. Getting Started A. Battery Save Feature After unpacking the LC100, it should be ready for use. A 9 volt alkaline battery comes preinstalled. The “Battery Save” feature is enabled and set to 30 minutes in case the unit is accidentally turned on in transit. The battery save feature will turn off the LC100 automatically if no keys are pressed after 30 minutes.
Communicator during calibration or installation of HART™ transmitters. The internal resistor takes the place of the 250 ohm resistor normally installed during the use of the model 275 Communicator. An internal jumper can be removed to enable this feature if desired. The unit is shipped with the jumper in place. To remove the jumper open the case and refer to Figure 2 to locate the jumper, then pull off the jumper to enable the resistor.
A. Milliamp Source Figure 3 shows a typical application where the LC100 is sourcing 4 to 20 mA into a device under test. Figure 3 - Sourcing 4 to 20 mA 1) Turn on the LC100. It will default to the mA source mode. 2) Connect the device to be calibrated. Warning: The loop must be closed for the LC100 to source current. If an open loop occurs “OL” will flash on the LCD indicating an overload or open condition.
5) The auto step feature provides automated output changes. Refer to the Auto Modes Section of the manual for more information. B. Milliamp Simulation Figure 4 shows how to connect the LC100 to act as a two-wire transmitter using an external power supply. In this application the power for the loop comes from the external supply and the LC100 simply controls the current flow through the loop. The procedure for controlling the output is the same as the milliamp source. Figure 4 - Simulating 4 to 20 mA C.
D. Milliamp Measure with Loop Power Again, Figure 5 shows the proper connections. But in this case the device under test is a twowire transmitter that requires an external power supply to generate an output current. In this application the LC100 will supply 24 volts to the loop while simultaneously measuring the resultant loop current. To turn on the loop power LOOP PWR supply press the mA measure mode.
input impedance of the LC100 ≥ 1 meg ohm while in this mode. Figure 6 - Measuring 0 to 28 VDC 5. Advanced Operating Modes A. Auto Step/Ramp Mode The LC100 has the ability to step the mA output in 25% steps automatically in 5 second intervals. It can also ramp the mA output from 4 mA to 20 mA then back to 4 mA in a linear fashion automatically. To activate the Auto-Step/Ramp mode use the following procedure: 1) The Auto Step/Ramp function can be used in either the source mA or simulate mA mode.
AUTO 3) Press the key once for the step mode, twice for the slow ramp mode and three times for the fast ramp mode. With each press a small annunciator will appear on the lower left side of the LCD indicating which one of the step/ramp modes has been selected. 4) Once enabled the step/ramp mode will run continuously until another key is pressed. B. Percent Error Mode This unique feature will calculate error as a percentage of span (4 mA to 20 mA yields a 16 mA span).
%ERROR 6) When the key is released the % display will return to normal operation. C. Min/Max Datalogging When the LC100 is in any of the measure modes (mA, mA w/loop power or voltage) it will continuously monitor and store the minimum and maximum values for that particular input mode. To operate the datalogging feature use the following procedure: 1) Place the LC100 in one of the measure modes. 2) Connect the LC100 to the unit under test.
6. Maintenance A. Battery Selection The LC100 operates on a standard 9V alkaline battery or an optional rechargeable 9V Ni-Cd battery. For most applications the 9V alkaline battery will suffice; however, in heavy use applications the 9V Ni-Cd may be a better choice. The 9V Ni-Cd battery supplied by Martel will offer approximately 3 hours of continuous use at 12 mA output on a full charge (the alkaline battery will yield about 12 hours).
1-800-821-0023 or www.martelcorp.com. 7. Specifications Input Range: 0.000 to 24.000 –25.00% to 125.00% Output Range 0.000 to 24.000 Source/Simulate: –25.00% to 125.00% Read VDC: 0 to 30 VDC Accuracy : ±0.015% of reading ±2 counts Resolution: .001 mA; .
8. Warranty Martel Electronics Corporation warrants all products against material defects and workmanship for a period of twelve (12) months after the date of shipment. Problems or defects that arise from misuse or abuse of the instrument are not covered. If any product is to be returned, a “Return Material Authorization” number must be obtained from our Customer Service Department. This number must be indicated on the return package as notice to our Receiving Department to accept the shipment.
www.martelcorp.com e-mail: sales@martelcorp.
