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Contents
(continued)
iii
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
2-111. DAC Buffered Reference Sip...................................................... 2-68
2-112. Calibration Hardware .................................................................. 2-69