GE Medical Systems Dash 3000, Service Manual, Page: 199 / 232

ASSEMBLY DRAWINGS: Theory Of Operation
Revision B Dash 3000/4000 Patient Monitor 9-11
2000966-105
The DAS block diagram with Masimo SET SPO2 consists of the following
three sections.
Parameter Functions of the DAS with Masimo SET SPO2
Except for the SPO2 parameter, the DAS with the Masimo SET SPO2
parameter supports the same parameters as DAS with the GE SPO2
parameter. See “ECG” on page 9-7.
Probes and Cable
The Dash 3000/4000 Masimo compatible DAS is intended for use
exclusively with pulse-oximetry probes from Masimo Corporation. An
adapter cable is used to interface the probes to the DAS front panel
Nicolay connector. The Nicolay connector utilizes a key pattern unique to
Masimo.
Section Description
ECG/
Respiration Separately isolated section includes a 7.3728MHz
Motorola MC68HSC705C8A microcontroller, A/D
conversion, signal processing hybrids and DC-DC
isolation converter.
Main DAS Separately isolated section includes a 22.1184MHz
Motorola MC68332 microcontroller with FLASH
and SRAM memory, an Analog Devices ADSP-
21062 32-bit floating point digital signal processor
running at 12.096MHz, A/D conversion, signal
processing hybrids/modules and DC-DC isolation
converter.
Non-Isolated
circuits Includes ECG and Main DAS isolation power
conversion circuitry, serial and parallel host
interfaces and NBP pump, valves, and over-
pressure circuitry.