Keithley DAS-4300 Series, User Manual, Page: 19 / 94

2-4 Functional Description
The DAS-4301/8K board uses a 4096-step DC signal offset voltage and a
4096-step fine gain control to calibrate the voltage input ranges.
The scope and test program supports binary, twos complement, and
absolute value data coding of the digitized analog input values. The
DAS-4300 Series Function Call Driver and VTX use twos complement
data coding only.
Memory
This section describes memory on the DAS-4301/8K board and on the
host computer.
Onboard Memory
The DAS-4301/8K board contains an 8K byte (8,192 samples) memory
buffer for storing digitized data as well as a nonvolatile EEPROM
memory location for storing calibration values.
Whenever a DAS-4301/8K board is idle, the host computer can access the
data in the onboard memory buffer, download it into its own main
memory, and process it.
Table 2-1. Analog Input Ranges
Analog
Input Range
Gain
Code Analog
Input Range
Gain
Code
±25 mV 12 ±200 mV 0
±31.25 mV 13 ±250 mV 1, 10
±62.5 mV 14 ±312.5 mV 6
±100 mV 8 ±0.5 V 2, 11
±125 mV 4, 9, 15 ±0.625 V 7
±156.25 mV 5 ±1.0 V 3