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98640A Analog Input Interface
A-to-D card the part number is on the component side near the right-angle posts. The part number is
98640-66501. The line of characters below the part number is called the date code.
It
identifies the
circuit (by letter) and electrical characteristics (the four-digit encoded date). If there is a suffix (typi-
cally a lower-case letter») it identifies additional revisions to the PCA.
If the date code on the A-to-D card does not correspond to the date code printed on the title page of
this manual) there are differences between the interface described in this manual and the Analog
Input Interfa.ce you have received. Contact your nearest Hewlett-Packard Sales and Service office
(listed at the back of this manual) for manual update information.
SPECIFI<:A TIONS
ElectricaJ
Power Requiirements:
.672W
(@
+12V)
.228W
(@
-12V)
+ 2.570W
(@
+5V)
3.5 Watts total
Input overvolltage protection: Transorbs redirect voltage in excess of ± 15 volts to ground.
Input resistance, each channel: 1 OOmegohms (power on)
WARNING
Each input is routed through a 1 k (one thousand) ohm
resistor to ground when the power is off ..
Functional Specifications
On-board clock: 1.667Mhz
Resolution of Internally clocked Pace rate: 600 nanoseconds
Sample and hold aperture time: 25 nanoseconds
Time from first Read to Hold at 55k samples/second: 7 microseconds
Minimum sample cycle: 18usec.
Linearity: 0.02% of full scale
Temperature coefficient for voltage offset: 10 microvolts per degree centigrade.
Common-mo.le rejection ratio (CMRR): 90db
@
60hz
1-3
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