Fluke 5700A Series - Page 5

Contents
(continued)
iii
2-48. Refresh Failure Detect Circuitry .................................................. 2-28
2-49. Decoding and Timing Circuitry ................................................... 2-28
2-50. Control Display Circuitry............................................................. 2-29
2-51. Output Display Circuitry.............................................................. 2-30
2-52. Keyboard Scanner Circuitry......................................................... 2-31
2-53. Knob Encoder Circuitry ............................................................... 2-31
2-54. Led Circuitry ................................................................................ 2-32
2-55. Keyboard Assembly (A1)................................................................. 2-32
2-56. Analog Section Detailed Circuit Description ....................................... 2-33
2-57. Filter/PA Supply (A18), Low-voltage Filter/Regulator Section ...... 2-33
2-58. Unregulated OSC Supplies .......................................................... 2-34
2-59. Unregulated LH Supplies............................................................. 2-34
2-60. Unregulated S Supplies................................................................ 2-34
2-61. Triac Circuit ................................................................................. 2-34
2-62. FR1 Supplies ................................................................................ 2-34
2-63. Unregulated FR1 Supply.............................................................. 2-34
2-64. FR2 Supplies ................................................................................ 2-35
2-65. Filter/PA Supply (A18), Power Amplifier Output Supply Section .. 2-35
2-66. ±PA Supplies Digital Control ...................................................... 2-35
2-67. ±250V and ±500V Supplies ......................................................... 2-37
2-68. +PA and -PA Supplies ................................................................. 2-37
2-69. ±PA Supply Current Limit ........................................................... 2-37
2-70. Regulator/Guard Crossing Assembly (A17)..................................... 2-38
2-71. Voltage Regulator Circuitry......................................................... 2-38
2-72. Regulated OSC Supplies.............................................................. 2-38
2-73. Regulated LH Supplies ................................................................ 2-39
2-74. Regulated S Supplies ................................................................... 2-39
2-75. FR1 Supply .................................................................................. 2-40
2-76. FR2 Supply .................................................................................. 2-40
2-77. Guarded Digital Control Circuitry ............................................... 2-41
2-87. Switch Matrix Assembly (A8).......................................................... 2-43
2-88. Switch Matrix Digital Control ..................................................... 2-44
2-89. Switch Matrix Operation: 11V DC and 22V DC Ranges ............ 2-46
2-90. Switch Matrix Operation: 2.2V AC and 22V AC Ranges ........... 2-48
2-91. Switch Matrix Operation: 220V AC and DC Ranges .................. 2-48
2-92. Switch Matrix Operation: 2.2V DC Range .................................. 2-51
2-93. Calibration of the 2.2V Range ..................................................... 2-53
2-94. Switch Matrix Operation: 220 mV DC Range............................. 2-53
2-95. Switch Matrix Operation: 220 mV AC Range............................. 2-56
2-96. Switch Matrix Operation: 2.2 mV and 22 mV AC Ranges.......... 2-56
2-97. Calibration of the mV Ranges...................................................... 2-56
2-98. Internal CAL Zero Amplifier ....................................................... 2-59
2-99. Switch Matrix 5725A Amplifier Interface ................................... 2-61
2-100. DAC Assembly (A11) ...................................................................... 2-61
2-101. Basic DAC Theory of Operation.................................................. 2-61
2-102. DAC Assembly Digital Control ................................................... 2-64
2-103. DAC Assembly Reference Circuitry............................................ 2-64
2-104. Duty-Cycle Control Circuit.......................................................... 2-65
2-105. DAC Filter Circuit........................................................................ 2-66
2-106. DAC Output Stage ....................................................................... 2-66
2-107. Sense Current Cancellation Circuit.............................................. 2-67
2-108. Linearity Control Circuit.............................................................. 2-67
2-109. Negative Offset Circuit ................................................................ 2-68
2-110. DAC Output Switching................................................................ 2-68