Potentiometric Meters
Introduction to Potentiometric Meters
Lesson 1 Potentiometric Principles
Figure 1-1. Poggendorf voltage comparison method
Learning Event 3: Describe the Slide Wire Potentiometer
Describe the Slide Wire Potentiometer cont'd
Figure 1-3. Slide wire potentiometer
Figure 1-4. Two-range potentiometer
Figure 1-5. Volt box
Learning Event 6: Describe Care and Precautions When Using The Potentiometer
Describe Care and Precautions When Using The Potentiometer cont'd
Practice Exercise - mm045570018
Practice Exercise cont'd - mm045570019
Practice Exercise cont'd - mm045570020
Lesson 2 The DC Potentiometer System
Figure 2-1. Interconnections cabling
Specifications - mm045570023
Figure 2-2. Front panel layout, Model 9931
Table 2-1. Measuring dials
ZERO pushbutton
Standardization
Figure 2-3. Connecting the system
Voltage measurement
Figure 2-4. Block diagram of potentiometer
Factors contributing to accuracy
Measuring circuit thermal EMFs
Installation - mm045570033
Figure 2-5. Light spot position
Figure 2-6. Front panel layout Model 9771
Control circuit
Figure 2-7. Simplified schematic diagram
Specifications - mm045570038
Installation - mm045570039
Output connections
Figure 2-10. Input/output versus load resistance
Additional adjustments
Learning Event 4: Describe the Model 9461A Galvanometer
Figure 2-12. Front panel layout of Model 9461A Galvanometer
Learning Event 5: Describe the Model 9154B Standard Cell Enclosure
Specifications - mm045570047
Installation - mm045570048
Front panel indicators and controls
Figure 2-13. Front panel layout of Transvolt Model 9154B
State of charge indicator
Monitoring of internal temperature
Figure 2-14. Block diagram of transvolt operation
Figure 2-15. (fo). 9154B schematic diagram
Figure 2-15a (fo). 9154B schematic diagram
Practice Exercise - mm045570056
Practice Exercise cont'd - mm045570057
Practice Exercise cont'd - mm045570058
Lesson 3 Precision Voltage Measurement of the Standard Cell
Cadmium cell
Describe the Construction and Maintenance of the Standard Cell
Learning Event 2: Describe the Standard Cell Opposition Measurement Technique
Figure 3-2. Opposition measurement connection
Learning Event 3. Describe the US Army Program
Figure 3-3. Flow chart for the US Army Volt
Describe the US Army Program cont'd
Figure 3-4. Sample observation sheet completed
Describe the US Army Program cont'd
Learning Event 4: Describe Measurements for Calibration of Standard Cell Enclosures at Army Calibration Facilities
Figure 3-5. Equipment setup for normal observations
Describe Measurements for Calibration of Standard Cell Enclosures at Army Calibration Facilities cont'd
Figure 3-6. Equipment setup for reverse observations
Figure 3-7. Standard cell graphs
Practice Exercise - mm045570074
Practice Exercise cont'd - mm045570075
Lesson 4 Null Detector 845R
Accuracy
Learning Event 2: Describe Operation of The 845AR Detector
Guard terminal
Describe Operation of The 845AR Detector cont'd
Figure 4-2. Bridge detector - floating supply
Figure 4-5. Standard cell voltage measurements
Describe Operation of The 845AR Detector cont'd
Learning Event 3: Describe Theory of Operation of The 845AR Null Detector
Figure 4-6. Model 845AR block diagram
The Model 845AR High Impedance Voltmeter cont'd
Figure 4-7 (fo). Functional schematic diagram of Model 845AR High Impedance Voltmeter
Figure 4-7a (fo). Functional schematic diagram of Model 845AR High Impedance Voltmeter
Figure 4-7b (fo). Functional schematic diagram of Model 845AR High Impedance Voltmeter
The Model 845AR High Impedance Voltmeter cont'd
Learning Event 4: Describe Troubleshooting the 845AR Null Detector
Figure 4-8. Troubleshooting chart (continued)
Figure 4-9. Waveform at TP10
Figure 4-10. Waveforms at TP6
Figure 4-12. Waveform at TP2 - Q104 removed
Troubles may sometimes be located by a thorough visual inspection
Lesson 4 Practice Exercise - mm045570097
Lesson 4 Practice Exercise cont'd - mm045570098
Lesson 5 Differential Voltmeter Model 887AB/AN
Figure 5-1. Passive meter loading
Figure 5-2. Basic null
Figure 5-4. Basic null-type meter
Figure 5-5. Constant load
Specifications - mm045570104
General - mm045570105
Learning Event 3: Describe Operation of the 887AB/AN Differential Voltmeter
Figure 5-8. Location and function of front panel controls, Model 887A/AB
Describe Operation of the 887AB/AN Differential Voltmeter cont'd - mm045570108
Describe Operation of the 887AB/AN Differential Voltmeter cont'd - mm045570109
Describe Operation of the 887AB/AN Differential Voltmeter cont'd - mm045570110
Figure 5-9. Measuring resistance with Model 887A
Figure 5-10. Simplified voltmeter input circuit
Figure 5-11. Measurement errors as a function of input-signal harmonic distortion
Figure 5-12. Simplified differential voltmeter
Learning Event 4: Describe Theory of Operation of the 887AB/AN Differential Voltmeter
Figure 5-14. Block diagram of Differential Voltmeter Model 887A
Describe Theory of Operation of the 887AB/AN Differential Volmeter
Describe Theory of Operation of the 887AB/AN Differential Volmeter cont'd - mm045570118
Describe Theory of Operation of the 887AB/AN Differential Volmeter cont'd - mm045570119
Describe Theory of Operation of the 887AB/AN Differential Volmeter cont'd - mm045570120
Describe Theory of Operation of the 887AB/AN Differential Volmeter cont'd - mm045570121
Describe Theory of Operation of the 887AB/AN Differential Volmeter cont'd - mm045570122
Describe Theory of Operation of the 887AB/AN Differential Volmeter cont'd - mm045570123
Describe Theory of Operation of the 887AB/AN Differential Volmeter cont'd - mm045570124
Figure 5-15 (fo). Schematic, Model 887A
Figure 5-15a (fo). Schematic, Model 887A
Figure 5-15b (fo). Schematic, Model 887A
Figure 5-15c (fo). Schematic, Model 887A
Practice Exercise - mm045570129
Practice Exercise cont'd - mm045570130
Answers to Practice Exercises - mm045570131
Answers to Practice Exercises cont'd
Introduction to Potentiometric Meters
Lesson 1 Potentiometric Principles
Figure 1-1. Poggendorf voltage comparison method
Learning Event 3: Describe the Slide Wire Potentiometer
Describe the Slide Wire Potentiometer cont'd
Figure 1-3. Slide wire potentiometer
Figure 1-4. Two-range potentiometer
Figure 1-5. Volt box
Learning Event 6: Describe Care and Precautions When Using The Potentiometer
Describe Care and Precautions When Using The Potentiometer cont'd
Practice Exercise - mm045570018
Practice Exercise cont'd - mm045570019
Practice Exercise cont'd - mm045570020
Lesson 2 The DC Potentiometer System
Figure 2-1. Interconnections cabling
Specifications - mm045570023
Figure 2-2. Front panel layout, Model 9931
Table 2-1. Measuring dials
ZERO pushbutton
Standardization
Figure 2-3. Connecting the system
Voltage measurement
Figure 2-4. Block diagram of potentiometer
Factors contributing to accuracy
Measuring circuit thermal EMFs
Installation - mm045570033
Figure 2-5. Light spot position
Figure 2-6. Front panel layout Model 9771
Control circuit
Figure 2-7. Simplified schematic diagram
Specifications - mm045570038
Installation - mm045570039
Output connections
Figure 2-10. Input/output versus load resistance
Additional adjustments
Learning Event 4: Describe the Model 9461A Galvanometer
Figure 2-12. Front panel layout of Model 9461A Galvanometer
Learning Event 5: Describe the Model 9154B Standard Cell Enclosure
Specifications - mm045570047
Installation - mm045570048
Front panel indicators and controls
Figure 2-13. Front panel layout of Transvolt Model 9154B
State of charge indicator
Monitoring of internal temperature
Figure 2-14. Block diagram of transvolt operation
Figure 2-15. (fo). 9154B schematic diagram
Figure 2-15a (fo). 9154B schematic diagram
Practice Exercise - mm045570056
Practice Exercise cont'd - mm045570057
Practice Exercise cont'd - mm045570058
Lesson 3 Precision Voltage Measurement of the Standard Cell
Cadmium cell
Describe the Construction and Maintenance of the Standard Cell
Learning Event 2: Describe the Standard Cell Opposition Measurement Technique
Figure 3-2. Opposition measurement connection
Learning Event 3. Describe the US Army Program
Figure 3-3. Flow chart for the US Army Volt
Describe the US Army Program cont'd
Figure 3-4. Sample observation sheet completed
Describe the US Army Program cont'd
Learning Event 4: Describe Measurements for Calibration of Standard Cell Enclosures at Army Calibration Facilities
Figure 3-5. Equipment setup for normal observations
Describe Measurements for Calibration of Standard Cell Enclosures at Army Calibration Facilities cont'd
Figure 3-6. Equipment setup for reverse observations
Figure 3-7. Standard cell graphs
Practice Exercise - mm045570074
Practice Exercise cont'd - mm045570075
Lesson 4 Null Detector 845R
Accuracy
Learning Event 2: Describe Operation of The 845AR Detector
Guard terminal
Describe Operation of The 845AR Detector cont'd
Figure 4-2. Bridge detector - floating supply
Figure 4-5. Standard cell voltage measurements
Describe Operation of The 845AR Detector cont'd
Learning Event 3: Describe Theory of Operation of The 845AR Null Detector
Figure 4-6. Model 845AR block diagram
The Model 845AR High Impedance Voltmeter cont'd
Figure 4-7 (fo). Functional schematic diagram of Model 845AR High Impedance Voltmeter
Figure 4-7a (fo). Functional schematic diagram of Model 845AR High Impedance Voltmeter
Figure 4-7b (fo). Functional schematic diagram of Model 845AR High Impedance Voltmeter
The Model 845AR High Impedance Voltmeter cont'd
Learning Event 4: Describe Troubleshooting the 845AR Null Detector
Figure 4-8. Troubleshooting chart (continued)
Figure 4-9. Waveform at TP10
Figure 4-10. Waveforms at TP6
Figure 4-12. Waveform at TP2 - Q104 removed
Troubles may sometimes be located by a thorough visual inspection
Lesson 4 Practice Exercise - mm045570097
Lesson 4 Practice Exercise cont'd - mm045570098
Lesson 5 Differential Voltmeter Model 887AB/AN
Figure 5-1. Passive meter loading
Figure 5-2. Basic null
Figure 5-4. Basic null-type meter
Figure 5-5. Constant load
Specifications - mm045570104
General - mm045570105
Learning Event 3: Describe Operation of the 887AB/AN Differential Voltmeter
Figure 5-8. Location and function of front panel controls, Model 887A/AB
Describe Operation of the 887AB/AN Differential Voltmeter cont'd - mm045570108
Describe Operation of the 887AB/AN Differential Voltmeter cont'd - mm045570109
Describe Operation of the 887AB/AN Differential Voltmeter cont'd - mm045570110
Figure 5-9. Measuring resistance with Model 887A
Figure 5-10. Simplified voltmeter input circuit
Figure 5-11. Measurement errors as a function of input-signal harmonic distortion
Figure 5-12. Simplified differential voltmeter
Learning Event 4: Describe Theory of Operation of the 887AB/AN Differential Voltmeter
Figure 5-14. Block diagram of Differential Voltmeter Model 887A
Describe Theory of Operation of the 887AB/AN Differential Volmeter
Describe Theory of Operation of the 887AB/AN Differential Volmeter cont'd - mm045570118
Describe Theory of Operation of the 887AB/AN Differential Volmeter cont'd - mm045570119
Describe Theory of Operation of the 887AB/AN Differential Volmeter cont'd - mm045570120
Describe Theory of Operation of the 887AB/AN Differential Volmeter cont'd - mm045570121
Describe Theory of Operation of the 887AB/AN Differential Volmeter cont'd - mm045570122
Describe Theory of Operation of the 887AB/AN Differential Volmeter cont'd - mm045570123
Describe Theory of Operation of the 887AB/AN Differential Volmeter cont'd - mm045570124
Figure 5-15 (fo). Schematic, Model 887A
Figure 5-15a (fo). Schematic, Model 887A
Figure 5-15b (fo). Schematic, Model 887A
Figure 5-15c (fo). Schematic, Model 887A
Practice Exercise - mm045570129
Practice Exercise cont'd - mm045570130
Answers to Practice Exercises - mm045570131
Answers to Practice Exercises cont'd
