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HYDRA
Service Manual
2-2
2-47. Totalizer Input ............................................................................. 2-16
2-48. External Trigger Input Circuits.................................................... 2-16
2-49. A/D Converter PCA......................................................................... 2-16
2-50. Analog Measurement Processor .................................................. 2-16
2-51. Input Protection ........................................................................... 2-17
2-52. Input Signal Conditioning............................................................ 2-20
2-58. Passive and Active Filters............................................................ 2-25
2-59. A/D Converter ............................................................................. 2-26
2-60. Inguard Microcontroller Circuitry............................................... 2-27
2-61. Channel Selection Circuitry......................................................... 2-27
2-62. Open Thermocouple Check......................................................... 2-28
2-63. Input Connector PCA....................................................................... 2-28
2-64. Display PCA .................................................................................... 2-29
2-65. Main PCA Connector .................................................................. 2-29
2-66. Front Panel Switches ................................................................... 2-29
2-67. Display......................................................................................... 2-30
2-68. Beeper Drive Circuit.................................................................... 2-30
2-69. Watchdog Timer and Reset Circuit ............................................. 2-30
2-70. Display Controller ....................................................................... 2-31
2-71. Memory PCA (2625A Only)............................................................ 2-33
2-72. Main PCA Connector .................................................................. 2-33
2-73. Address Decoding........................................................................ 2-33
2-74. Page Register ............................................................................... 2-33
2-75. Byte Counter................................................................................ 2-34
2-76. Nonvolatile Memory.................................................................... 2-34
2-77. IEEE-488 Interface (Option -05)...................................................... 2-34