Instruction Sheet Introduction The Fluke 705 Loop Calibrator is a source and measurement tool for 0 to 20 mA or 4 to 20 mA current loop testing and a measurement tool for dc voltage from 0 to 28 V. The calibrator does not source and measure simultaneously.
Warning To avoid possible electric shock or personal injury: Never apply more than 30 V between any two terminals, or between any terminal and earth ground. Inspect the test leads for damaged insulation or exposed metal. Check lead continuity. Replace damaged test leads before you use the meter.
Pushbutton Functions Button Function Press to select source, simulate, or measure modes. Press while turning on the calibrator to select loop power. The Loop symbol appears in the display. Press simultaneously to start the SpanCheck function. The symbol appears in the display.
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Sourcing mA Use source mode whenever you need to supply current into a passive circuit. Insert the test leads into the terminals as shown below. Note A path must exist for current to flow between the output and mA terminals, otherwise the display will indicate an overload (OL) when you set an output value.
LIMITED WARRANTY & LIMITATION OF LIABILITY This Fluke product will be free from defects in material and workmanship for three years from the date of purchase. This warranty does not cover fuses, disposable batteries or damage from accident, neglect, misuse or abnormal conditions of operation or handling.
Simulating a Transmitter When simulating the operation of a transmitter, the calibrator regulates the loop current to a known value that the user selects. A 12 to 28 V loop supply must be available. Insert the test leads as shown below. Simulate LOOP CALIBRATOR Press to scroll...
Auto Ramping the mA Output Auto ramping allows you to continuously apply a varying current stimulus from the calibrator to a passive (sourcing) or active (simulate) loop while your hands remain free to test the transmitter’s response. The calibrator produces a continuously repeating ramp in your choice of three waveforms: 0 % - 100 % - 0 % 40-second smooth ramp 0 % - 100 % - 0 % 15-second smooth ramp...
Changing the Current Span The calibrator’s current output span has two settings: 4 mA = 0 %, 20 mA = 100 % (default) 0 mA = 0 %, 20 mA = 100 % (optional) To change and save the current output span in a nonvolatile memory (retained when the power is turned off), press U while turning on the calibrator to mA.
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Measuring dc mA with Loop Power Loop power provides +24 V to power a transmitter and to read loop current simultaneously. To exit, turn the calibrator off or to V. LOOP CALIBRATOR Measure Press and hold while turning on the calibrator to mA.
Do not allow water into the case. Remove any input signals prior to removing test leads and opening case. When servicing the calibrator, use only specified replacement parts. For maintenance procedures not described in this sheet, contact a Fluke Service Center.
In Case of Difficulty Check the battery and test leads. Replace as needed. If the calibrator needs repair, contact a Fluke Service Center. If the calibrator is under warranty, see the warranty statement for terms. If the warranty has lapsed, the calibrator will be repaired and returned for a fixed fee.
Replacing the Battery Warning To avoid false readings, which could lead to possible electric shock or personal injury, replace the battery as soon as the battery indicator ( ) appears in the display. rt07f.eps...
Replacement Parts and Accessories Replacement Parts PN or Item Description Model No. Qty. 9 V battery, ANSI/NEDA 614487 1604A or IEC 6LR61 Holster, Yellow MP85 Case top 665098 MP86 Case bottom 665109 Case screw 832246 MP89 Non-skid foot 885884 MP92 Battery door 665106 Keypad...
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MP85 MP86 MP89 MP92 CD-ROM AC72 Alligator Clips TL75 Test Lead Set rt10f.eps...
Specifications Specifications are based on a one year calibration cycle and apply from +18 C to +28 C unless stated otherwise. “Counts” means number of increments or decrements of the least significant digit. DC Volts Input Range: 28 V ( 30 V max) Input Impedance: 1 M Accuracy: (0.025 % of reading + 2 counts)
General Specifications Maximum voltage applied between any terminal and earth ground or between any two terminals: 30 V Storage temperature: -40 C to 60 C Operating temperature: -10 C to 55 C Operating altitude: 3000 meters maximum Temperature coefficient: 0.005 % of range per C for the temperature ranges -10 to 18 C and 28 to 55 C Relative humidity: 95 % up to 30 C, 75 % up to 40 C, 45 % up to 50 C, and 35 % up to 55 C...