Martel LC-100 Loop Calibrator Manual PDF
Contents
1. 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 inter vals Itcan 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 Place the LC100 in one or the other mode 2 Connect the LC100 to the device under test 11 AUTO 3 Press the kev once for the step mode twice for the slow ramp mode and three times for the fastramp 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 continuousiv until another kev is pressed B Percent Error Mode This unique feature will calculate error as a per centage of span 4 mA to 20 mA vields a 16 mA span The percent error feature allows the user to Zero Out the mA display so that the deviation from the ideal value can be displayed on the error display The procedure is as fol lows 1 Connect the LC100 to the unit under test 2 Place the LC100 in one of the mA output modes source or simulate 3 Adjust the LC100 to the desired output 4 If the unit under t2. Cd battery For most applications the 9V alkaline battery will suffice however in heavy use appli cations 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 The charger supplied by Martel will provide an overnight charge rate 10 12 hours and will also power the LC100 for bench use while maintaining a float charge on the Ni Cd battery Warning Never connect the AC adapter charger with the 9V alkaline battery installed To order the 9V Ni Cd battery or AC adapter charger contact Martel Electronics at 800 821 0023 B Input Protection The LC100 incorporates a fuseless input protec tion and will tolerate most misconnections up to 250 VAC or 250 VDC for up to 30 seconds duration Because of this protection no mainte nance is required C Calibration The LC100 is designed to hold its rated accura cy fora minimum of one 1 year It is therefore recommend that an annual re calibration be done to ensure operation within specification Contact Martel s Customer Service Department for re calibration information at 14 l 800 821 0023 or www martelcorp com 7 Specifications Input Range 0 000 to 24 000 25 00 to 125 00 Output Range Source Simulate 0 000 to 24 000 25 00 to 125 00 Read VDC 0 to 30 VDC Accuracy 0 015
3. When using the probes keep your fingers away from the probe contacts Keep your fingers behind the finger guards on the test leads Do not use the calibrator if it operates abnor mally Protection may be impaired When in doubt have the calibrator serviced Do not operate the calibrator around explo sive gas vapor or dust Disconnect test leads before changing to another measure or source function e When servicing the calibrator use only speci fied replacement parts To avoid false readings which could lead to possible electric shock or personal injurv replace the batterv as soon as the batterv indicator appears A Caution To avoid possible damage to calibrator or to equipment under test e Use the proper jacks function and range for your measurement or sourcing application 2 Nomenclature Mode Annunciators Step Ramp Annunciators On Off Loop Power Applies 24VDC gt Loop Power in MA Measure Mode 96 Error Kev Allows User to Displav the Error Actual vs Ideal At Anv Calibration Point le a SOURCE lt q _ 20 000 ate 100 00 MARTEL ELECTRONIC auto LOOP MIN ERROR 25 T Digtal Knob lt gt L lt lt Simultaneous Display 4mA 0 00 20 20 00 Mode Key Auto Step Ramp Selects Between
4. displaying the current in mA on the main dis play The lower smaller display area is show ing percentage relative to a 4 to 20 mA span D Milliamp Measure with Loop Power Again Figure 5 shows the proper connections But this case the device under test is a two wire 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 result ant loop current To turn on the loop power Supply press the key while in the mA measure mode 4 20 mA 4 to 20mA OUTPUT DEVICE LC100 MERSURE IT Max Input 24mA MARTEL secous Note To measure the output of a 2 wire 1 wove transmitter use the Loop Power option emo aa See instructions for more details lt gt Figure 5 Measuring 4 to 20 mA NOTE The loop power mode can only be enabled while in the mA measure mode E Voltage Measure Figure 6 shows how to connect the LC100 to measure DC voltage up to 28 volts To activate the volts measure function simply press the MODE key to toggle through the functions until the volts measure mode is reached The 10 input impedance of the LC100 2 1 meg ohm while in this mode VOLTAGE OUTPUT DEVICE Max Input 28VDC pe auto MAX
5. of reading 2 counts Resolution 001 mA 001 volts Loop Supply Voltage 24 VDC Typical Drive Capability 12009 w o Hart 9500 w Hart Auto 90 Error Function Ves Selectable Decade Adjustment Yes Auto Step Ramp Yes Preset Outputs 5 Loop Power Measure Yes Capability Operating Temperature 10 to 55 C Power Supply 1 9V Battery Rechargeable Battery Option Yes AC Adapter Yes Size 5 7 xX 3 15 x 1 43 Weight 12 02 15 8 Warrantv Martel Electronics Corporation warrants all prod ucts against material defects and workmanship for a period of twelve 12 months after the date of shipment Problems or defects that arise from mis use 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 Any package not so marked will not be accepted and will be returned to the shipper Martel will not be responsible for damage as a result of poor return packaging Out of warranty repairs and recalibration will be subject to specific charges Under no circumstances will Martel Electronics be liable for any device or circumstance beyond the value of the product 16 MARTEL AN U niu www martelcorp com e mail sales martelcorp com Tel 603 434 8179 800 821 002
6. 3 Fax 603 434 1653 Martel Electronics PO Box 770 1F Commons Drive Londonderry NH 03053 BETA CALIBRATORS www betacalibrators com Tel 800 537 2181 or 972 241 2200 Fax 972 241 2200 Beta Calibrators 2309 Springdale Rd Farmers Branch Texas 75234 0219053 2 05 RevD
7. MARTEL LECTRONICS LC100 Loop Calibrator Table of Contents 1 2 4 6 7 8 Introduction 1 1 Customer Service 1 2 Unpacking 1 3 Safety Information Nomenclature 3 Getting Started A Battery Save Feature B HART Resistor Setup Basic Operating Modes A Milliamp Source B Milliamp Simulation C Milliamp Measure D Milliamp Measure with Loop Power E Voltage Measure Advanced Operating Modes A Auto Step Ramp Mode B Percent Error Mode C Min Max Datalogging Maintenance A Battery Selection B Input Protection Calibration Specifications Warranty socked ae ke ees LC100 1 Introduction The Martel LC100 is designed to be a complete 4 to 20mA current calibrator for both trouble shooting 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 Itcan also measure process signal voltages up to 28VDC with the same 0 015 of reading accuracy A digital knob user interface combined with decade output control allows the user to make both la
8. Step and Ramp slow or fast 25 Key Steps Output 4 8 12 16 20mA for Output Control Cursor Control Keys Select Decade To Be Controlled Figure 1 3 Getting Started A Batterv Save Feature After unpacking the LC100 it should be readv for use A 9 volt alkaline battery comes pre installed The Batterv Save feature is enabled and set to 30 minutes in case the unit is acci dentally turned on in transit The battery save feature will turn off the LC100 automatically if no keys are pressed after 30 minutes To change the length of time on the battery save feature or to disable it completely perform the following steps during power up 1 Turn off the LC100 AUTO 2 Hold the key down firmly 3 Turn on the LC100 4 After power up wait about 1 second and release the Auto key 5 The display will now indicate the amount of time the battery save feature is set for off to 30 minutes 6 Using the knob set the desired time off to 30 minutes AUTO 7 Press again to store the value and return the unit to normal mode The stored value will remain in memory until changed by the operator B HART Resistor Setup The LC100 incorporates an internal 250 ohm resistor to facilitate using a Rosemount 275 6 Communicator during calibration or installation of HART transmitters The internal resistor takes the place of the 250 ohm resistor normal ly installed duri
9. e mA source mode 2 Connect the device to be calibrated Warning The loop must be closed for the LC 100 to source current If an open loop occurs OL will flash on the LCD indicating an overload or open condition 3 The output can be adjusted to the desired value by using the knob interface and select ing the decade to be adjusted 4 The output can also be stepped in 4 mA 25 steps 25 using the key 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 actas 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 POWER SUPPLV 4 to 20mA 30 VDC MAX LC100 EJ 20 000 Hf INPUT 100 00 DEVICE MARTEL cxzcrnowes FO VY Loop pwa LC 100 acts like a 2 wire transmitter in the Simulate Mode lt gt Figure 4 Simulating 4 to 20 mA C Milliamp Measure Figure 5 shows how to connect the LC100 to measure a 4 20 mA loop In this application the LC100 is simply reading the loop current and
10. est does not read exactly as ERROR it should hold down the key and adjust the knob unit until the unit under test reads correctly Continue to hold down the ERROR key 5 The reading in the display area will be the error or deviation calculated as a percentage of span 12 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 3 Clear the min max memory by pressing both keys min and max simultaneously The LCD will display CLR when the memory is cleared 4 Allow the unit to log min and max for as long as required Warning You may want to disable the Battery Save feature before using the Dataloggiong Mode to prevent the LC100 from turning off pre maturely 5 At any time press the min or max to display the value stored 6 Turning off the LC100 or changing modes will clear the memory Be sure to record your data before turning off the unit 13 6 Maintenance A Batterv Selection The LC100 operates on a standard 9V alkaline battery or an optional rechargeable 9V Ni
11. ng 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 The jumper can be stored outside of the unit or re installed only on one pin so that the circuit remains open o 0 44 J8 HART JUMPER Remove Jumper LCD to Enable HART 250 Ohm Resistor LC100 MAIN PCB Figure 2 Note When the 250 ohm resistor is enabled the load driving capability is reduced from 1200 ohms to 950 ohms In most cases this should not be a problem when calibrating Non HART compatible products 4 Basic Operating Modes The LC100 offers 4 modes of milliamp opera tion and one voltage measure mode The fol lowing text and figures explain the various oper ating modes A Milliamp Source Figure 3 shows a tvpical application where the LC100 is sourcing 4 to 20 mA into a device under test 4 20 mA INPUT DEVICE 4 to 20mA RECORDER INDICATOR SCADA SYSTEM ETC LC100 SOURCE 20 000 100 00 MARTEL exzcrnow ics Max Load 1200 ohms without Hart wove pur 950 ohms with Hart loop pwr Pero a lt gt Figure Sourcing 4 to 20 mA 1 Turn on the LC100 It will default to th
12. rge or small output changes with ease Several unique functions such as the auto step ramp modes allow the LC100 to test valve actuators for smoothness and proper operation The LC100 can also power two wire transmit ters while simultaneously reading the resultant loop current All readings are displayed in both milliamps and of span 1 1 Customer Service Corporate Office www martelcorp com e mail sales martelcorp com Tel 603 434 8179 800 821 0023 Fax 603 434 1653 Martel Electronics PO Box 770 1F Commons Drive Londonderry NH 03053 Texas Office www betacalibrators com Tel 800 537 2181 or 972 241 2200 Fax 972 241 2200 Beta Calibrators 2309 Springdale Rd Farmers Branch Texas 75234 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 ship ment 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 After examining and removing contents save packing material and carton in the event reshipment is necessary 1 3 Safety information Symbols Used The following table lists the International Electrical Symbols Some or all of these sym bol
13. s may be used on the instrument or in this manual Symbol Description Ny Alternating Current AS AC DC a mn O gt gt i enl G Batterv CE Complies with European Union Directives DC 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 e Warning identifies conditions and actions that may pose hazards to the user e Caution identifies conditions and actions that may damage the instrument being used Use the calibrator onlv as specified in this man ual otherwise injury and damage to the calibra tor mav occur AN Warning To avoid possible electric shock or personal injurv e Do not apply more than the rated voltage See specifications for supported ranges e Follow all equipment safety procedures e 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 surround ing the connectors Select the proper function and range for your measurement Make sure the battery cover is closed and latched before you operate the calibrator Remove test leads from the calibrator before you open the battery door Inspect the test leads for damaged insulation or exposed metal
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