HP 54501A Service Manual page 72

100 mhz digitizing oscilloscope

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HP 54501A SERVICE

and the HP-113 in accordance with IEEE 488

standards . The 75160 is an 8-bit data buffer

and the 75162 is an 8-bit control line buffer .

The HP-IB is a 24-pin shielded cable carrying

8 data lines, 8 control lines, 7 system grounds,

and 1 chassis ground.

The keypad/RPG interface is interpreted as an

8 X 8 matrix with 8 row lines connected

through an open-collector buffer to the 8 lower

address lines and the 8 column lines connec-

ted through a tri-state buffer to the 8 lower

data lines .

The acquisition interface consists of 16 func-

tional lines : 3 data latch controls, 4 logic trig-

ger functions, 2 DAC functions, 3 timebase

functions, and four unused selects . Other in-

terface circuitry is made up of buffers for ad-

dress and data lines and five latched data lines

for control signals to the Timebase and Logic

Trigger and the calibration outputs to the HP

54501A rear panel . The CPU provides 3

clocks to acquisition via the interface : 1 .5 kHz

to rear panel DC Calibrator Output, 2 .5 MHz

for dither, and 20 MHz to D/A Converter and

Probe Compensation AC Calibrator Output .

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