Fluke 8845A Calibration Manual page 4

8845A/8846A
Calibration Manual
2
8845A Accuracy........................................................................................ 1-13
Additional Low Frequency Errors............................................................. 1-13
Resistance ...................................................................................................... 1-14
Input Characteristics.................................................................................. 1-14
8846A Accuracy........................................................................................ 1-14
8845A Accuracy........................................................................................ 1-14
Additional Ohms Errors ............................................................................ 1-15
DC Current .................................................................................................... 1-15
Input Characteristics.................................................................................. 1-15
Accuracy (8846A)..................................................................................... 1-15
Accuracy (8845A)..................................................................................... 1-16
Additional Current Errors ......................................................................... 1-16
AC Current .................................................................................................... 1-16
Input Characteristics.................................................................................. 1-16
8846A Accuracy........................................................................................ 1-17
8845A Accuracy........................................................................................ 1-18
Additional Low Frequency Errors............................................................. 1-18
Frequency ...................................................................................................... 1-18
8846A Accuracy........................................................................................ 1-19
8845A Accuracy........................................................................................ 1-19
Gate Time vs. Resolution.......................................................................... 1-19
Additional Low Frequency Errors............................................................. 1-20
Capacitance (8846A Only) ............................................................................ 1-20
Temperature (8846A only) ............................................................................ 1-20
Continuity ...................................................................................................... 1-20
Diode Test ..................................................................................................... 1-21
Measurement Rates ....................................................................................... 1-21
Measurement Uncertainty.................................................................................. 1-21
Interpreting Accuracy Specifications................................................................. 1-22
24-Hour Accuracy ......................................................................................... 1-22
90-Day and 1-Year Accuracy ........................................................................ 1-22
Temperature Coefficients .............................................................................. 1-22
Configuring for Highest Accuracy Measurements ............................................ 1-22
DC Voltage, DC Current, and Resistance Measurements ............................. 1-22
AC Voltage and AC Current Measurements: ................................................ 1-22
Frequency and Period Measurements:........................................................... 1-22
General Maintenance .......................................................................... 2-1
Introduction........................................................................................................ 2-3
Warranty Repairs and Shipping Information ..................................................... 2-3
General Maintenance Information ..................................................................... 2-3
Required Equipment...................................................................................... 2-3
Power Requirements...................................................................................... 2-3
Static Safe Handling ...................................................................................... 2-3
Cleaning ............................................................................................................. 2-4
Fuse Replacement .............................................................................................. 2-4
Line-Power Fuse............................................................................................ 2-4
Current-Input Fuses ....................................................................................... 2-5
If the Meter Does Not Turn On.......................................................................... 2-7
Display Tests...................................................................................................... 2-7
Disassembly Procedures .................................................................................... 2-7
General Disassembly ..................................................................................... 2-7
Main Chassis Disassembly ............................................................................ 2-8
Front Panel Disassembly ............................................................................... 2-8
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