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Theory of Operation (2620A/2625A)
Functional Block Description
2
2-5
–5.4 Vdc (Vss)
+5.3Vdc (Vdd)
+5.1 Vdc (Vcc)
–5 Vdc
POWER
SUPPLY
DIGITAL KERNEL
EEPROM
CALIBRATION
CONSTANTS
RAM ROM
IEEE-488
OPTION -05
(2620A ONLY)
RS-232
µ
P
FRONT PANEL
SWITCHES
DISPLAY CONTROLLER
VACUUM FLUORESCENT
DISPLAY
DISPLAY ASSEMBLY
SERIAL
COMMUNICATION
ANALOG
MEASUREMENT
PROCESSOR
(A/D CONVERTER)
INPUT SIGNAL
CONDITIONING
INPUT PROTECTION
INPUT MULTIPLEXING
GUARD
CROSSING
ANALOG INPUT CONNECTOR
A/D CONVERTER
PCA
MEMORY
(2625A ONLY)
+5.6 Vdc (Vddr)
CALENDAR
CLOCK
5.4 Vac
–30 Vdc
INGUARD
OUTGUARD
MAIN PCA ASSEMBLY
MICRO CONTROLLER
INGUARD
OUTGUARD
DIGITAL
I/O
s2f.eps
Figure 2-2. Overall Functional Block Diagram