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5700A/5720A Series II Calibrator
Service Manual
2-2
2-36. Glue Logic ................................................................................... 2-25
2-37. RAM (Random-Access Memory)................................................ 2-25
2-38. ROM (Read-Only Memory) ........................................................ 2-25
2-39. Electrically-Erasable Programmable Read-Only
Memory (EEPROM) .................................................................... 2-26
2-40. DUART (Dual Universal Asynchronous Receiver/transmitter)
Circuit........................................................................................... 2-26
2-41. Clock/Calendar Circuit................................................................ 2-26
2-42. Clock Filter Circuit...................................................................... 2-27
2-43. CPU to Rear Panel Interface........................................................ 2-27
2-44. CPU to Front Panel Interface....................................................... 2-27
2-45. Fan Monitor ................................................................................. 2-27
2-46. Front Panel Assembly (A2).............................................................. 2-28
2-47. Clock Regeneration Circuitry...................................................... 2-28
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