Fluke MET/CAL Procedure ============================================================================= INSTRUMENT: Simpson 270-2,3: CAL ADJ /5520 DATE: 09-Sep-97 AUTHOR: Fluke Corporation REVISION: $Revision: 1.1 $ ADJUSTMENT THRESHOLD: 70% NUMBER OF TESTS: 1 NUMBER OF LINES: 131 CONFIGURATION: Fluke 5520A ============================================================================= # # Compatibility: # 5500/CAL 5.0 or MET/CAL 5.0 or later. # # Subprocedures: # None # # Required Files: # sim260a1.bmp # sim270a2.bmp # sim260a3.bmp # sim260a4.bmp # # System Specifications: # TUR calculation is based on specification interval of the accuracy file. # The default 5520A accuracy file contains 90 day specs. # # Fluke makes no warranty, expressed or implied, as to the fitness # or suitability of this procedure in the customer's application. # STEP FSC RANGE NOMINAL TOLERANCE MOD1 MOD2 3 4 CON 1.001 ASK- P F W 1.002 ASK+ X 1.003 HEAD PRELIMINARY INSTRUCTIONS 1.004 DISP Warm-up time: NONE 1.004 DISP Temperature : 20 - 40degC 1.004 DISP Humidity: <80% 1.005 DISP [32] WARNING 1.005 DISP HIGH VOLTAGE is used or exposed during the performance 1.005 DISP of this calibration. DEATH ON CONTACT may result if 1.005 DISP personnel fail to observe safety precautions. 1.006 DISP [32] NOTICE 1.006 DISP Check the meter sensitivity before replacing components 1.006 DISP or performing calibration. A change in meter sensi- 1.006 DISP tivity is evident when all ranges are off calibration. 1.007 HEAD DISASSEMBLY INSTRUCTIONS 1.008 DISP Turn the FUNCTION SWITCH to +DC, and remove all 1.008 DISP connections and test leads. 1.008 DISP 1.008 DISP Remove the four screws securing the rear cover to the 1.008 DISP the front panel. 1.008 DISP 1.008 DISP Remove the rear cover. 1.009 HEAD DC CURRENT: 50uA Range 1.010 DISP Adjust the front panel mechanical METER ZERO with 1.010 DISP the 270 in a horizontal position. 1.010 DISP 1.010 DISP Check that the adjuster pin does NOT rest against the 1.010 DISP adjustment fork when finished. 1.011 DISP Set the Function Switch to +DC. 1.011 DISP Set the Range Switch to 50uA. 1.012 DISP Connect the 5520A to the UUT as follows: 1.012 DISP [32] 5520A AUX HI to UUT 50uA 1.012 DISP [32] 5520A AUX LO to UUT COMMON 1.013 5520 50.0uA S 2W 1.014 PIC sim260a1 1.015 HEAD CURRENT: 1mA Range 1.016 ASK+ R 1.017 DISP Connect the 5520A to the UUT as follows: 1.017 DISP [32] 5520A AUX HI to UUT POS 1.017 DISP [32] 5520A AUX LO to UUT COMMON 1.018 RNG 1mA 1.019 5520 1.00mA S 2W 1.020 PIC sim270a2 1.021 5520 * S 1.022 HEAD CURRENT: 10A Range 1.023 DISP Set the Range Switch to 10mA/AMPS. 1.024 DISP Connect the 5520A to the UUT as follows: 1.024 DISP [32] 5520A 20A to UUT + 10 AMPS 1.024 DISP [32] 5520A AUX LO to UUT - 10 AMPS 1.025 ASK- R 1.026 5520 10.0A HC N 2W 1.027 MATH MEM1 = MEM - 10 1.028 JMPZ 1.030 0.2U 1.029 DISP IF NECESSARY, Adjust the sliding millivolt tap on R22. 1.029 DISP (the wire with tap). DO NOT Adjust WITH CURRENT APPLIED 1.030 ASK+ R 1.031 HEAD DC VOLTAGE 1.032 DISP [32] * NOTE * 1.032 DISP It may be necessary to make a compromise adjustment 1.032 DISP of R27 to meet tolerances of both voltage and current 1.032 DISP ranges. Accuracy of the DC Voltage depends on the 1.032 DISP accuracy of the previous adjustments. 1.033 DISP Connect the 5520A to the UUT as follows: 1.033 DISP [32] 5520A NORMAL HI to UUT POS 1.033 DISP [32] 5520A NORMAL LO to UUT COMMON 1.034 HEAD DC VOLTAGE: 2.5V Range 1.035 5520 2.5 2.50V N 2W 1.036 MATH MEM1 = MEM - 2.5 1.037 JMPZ 1.040 0.03125U 1.038 DISP If voltage readings fail, re-adjust R27 and R32 for 1.038 DISP a compromise between current and voltage readings. 1.039 JMP 1.016 1.040 HEAD AC VOLTAGE 1.041 DISP Connect the 5520A to the UUT as follows: 1.041 DISP [32] 5520A NORMAL HI to UUT POS 1.041 DISP [32] 5520A NORMAL LO to UUT COMMON 1.042 DISP Set the Model 270 FUNCTION SWITCH to AC. 1.043 HEAD AC VOLTAGE: 250V Range 1.044 RNG 250V AC 1.045 5520 250V 60H SI S 2W 1.046 PIC sim260a3 1.047 HEAD AC VOLTAGE: 2.5V Range 1.048 RNG 2.5V AC 1.049 5520 2.50V 60H SI S 2W 1.050 PIC sim260a4 1.051 DISP Connect the 5520A to the UUT as follows: 1.051 DISP [32] 5520A NORMAL HI to UUT A.C. 5000 1.051 DISP [32] 5520A NORMAL LO to UUT COMMON 1.052 ASK- R 1.053 5520 1000V 60H SI N 2W 1.054 MATH MEM1 = MEM - 1000 1.055 JMPZ 1.058 100U 1.056 DISP If the 5000V AC range is out-of-tolerance, readjust R31 1.056 DISP slightly. This will also require recalibration of R28! 1.057 JMP 1.040 1.058 END