MODEL DG535 Digital Delay / Pulse Generator - SLAC

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CIRCUIT DESCRIPTIONThe <strong>DG535</strong> has three printed circuit boards. The"top" printed circuit board (Figure 8) containsthe unregulated power supplies, microprocessor,GPIB interface, and the slow counters(
PORT ADDRESS DECODINGI/O port decoding is done by U404 (74HC154) and U308 (74HC138). These IC's provide active lowoutputs which are used to strobe input and output ports, and to provide reset strobes.Hex Name DescriptionB8 CTR6_CS LSI Counter/Timer Chip selectB0 INT_CLR Clears timer interrupt flagA8Spare to top PCBA0 FLAG_CLR Clears OVERRUN and TRIGGERED Flags98 P11_CS HC Counter preset register (C&D)90 P10_CS HC Counter preset register (A&B)88 P9_CS ECL Counter preset register (C&D)80 P8_CS ECL Counter preset register (A&B)78 P7_CS Output termination control70 P6_CS Key pad input strobe68 P5_CS Front panel LED indicators60 P4_CS Misc status bits input strobe58 P3_CS Internal rate generator control50 P2_CS Analog MUX select48 P1_CS Output polarity and trigger source40 DISP_CS Front panel LCD select38 Spare to bottom PCB30 DAC_CS Write strobe to 12bit D/A28 CTR5_CS LSI counter Chip select20 CTR4_CS LSI counter Chip select18 CTR3_CS LSI counter Chip select10 CTR2_CS LSI counter Chip select08 CTR1_CS LSI counter Chip select00 IEEE_CS GPIB controller Chip selectINPUT PORTSThe two eight-bit input ports on the microprocessor's bus, U406 and U407, are 74HC244 Octal bufferswhich are used to read the front panel key pad and miscellaneous status bits from the instrument.Status Bits (U406) Name DescriptionB7Always OneB6Always OneB5 TIMER_INT 1KHz Clock TickB4 DROPOUT Low Power SupplyB3 UNLOCK 80MHz PLL ErrorB2 BUSY Timing Cycle in ProgressB1 OVERRUN Trigger Rate too FastB0 TRIGGERED Triggered at least once23
Page 1 and 2: MODEL DG535Digital Delay / Pulse Ge
Page 3 and 4: Time Delay vs Repetition 9GPIB PROG
Page 5 and 6: Sheet #2 10 MHz Reference and 80 MH
Page 7 and 8: QUICK START INSTRUCTIONS(1) Make ce
Page 9 and 10: ABRIDGED COMMAND LISTINITIALIZATION
Page 11 and 12: GUIDE TO OPERATIONINTRODUCTIONThe D
Page 13 and 14: is remedied.To use the timebase in
Page 15 and 16: It is often desirable to trigger th
Page 17 and 18: STORE and RECALL MENUSThere are ten
Page 19: other. The pulling of one channel b
Page 22 and 23: 10.0MHz reference is too small or m
Page 24 and 25: incorrect cursor mode will have no
Page 26 and 27: and a trigger input impedance of 50
Page 28 and 29: GPIB PROBLEMSThe first requirement
Page 30 and 31: CALIBRATION MENUSTo access the cali
Page 34 and 35: threshold, reference oscillator fre
Page 36 and 37: Each of the four delay channels beh
Page 38 and 39: portion of the delay is complete, A
Page 40: +10.000VDC reference is generated o
Page 43 and 44: C 301G 5-00056-512 .1U Cap, Stacked
Page 45 and 46: Q 302C 3-00177-321 2N2222 Transisto
Page 47 and 48: U 109 3-00201-340 MC10H105 Integrat
Page 52 and 53: FAST TRANSITION-TIMEMODULESOPTION 0
Page 54: SETUP FOR OUTPUT STEPS UP TO15 VOLT

MODEL DG535 Digital Delay / Pulse Generator - SLAC

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