Led And Vr; Differences From Conventional Ad System - Hitachi 902 Service Manual

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LED and VR

No. Name
1 INT
2 BSY1
3 BSY2
4 ERR
5 LED1
6 LED2
7 LED3
No. Name
1 VR1
2 VR2
3 VR3
4 VR4
*) VR1 and VR2 are not adjusted after shipment from the factory.
(already adjusted with exclusive tool)
< Differences from Conventional AD System >
Described below are the differences between the ADC mounted on the EMIO100 board and
the conventional one by comparing with the ADC-V board.
A/D System
Number of ADCs
Number of channels
Data averaging
Lit upon interrupt request from EMIO100 board.
Extinguished during operation of ADC (channel 1, 3, 4).
Extinguished during operation of ADC (channel 2).
Extinguished when HB command is abnormal.
Not mounted.
Not mounted.
Not mounted.
For ADC (ADS7807) span correction*
For ADC (ADS7807) offset correction*
For adjustment of indicated temperature value
For adjustment of actual temperature in incubation bath
ADC - V
Double integral type
2 pcs
2 ch
Analog averaging with
integration circuit
10 - 11
LED
Function
VR
Function
Sequential comparison type
1 pc
4 ch (switching type)
Averaging through continuous
measurements and calculation
EMIO100