Hitachi 902 - Differences from Conventional AD System; LED and VR

10 - 11
(3) LED and VR
LED
No. Name Function
1 INT Lit upon interrupt request from EMIO100 board.
2 BSY1
Extinguished during operation of ADC (channel 1, 3, 4).
3 BSY2
Extinguished during operation of ADC (channel 2).
4 ERR
Extinguished when HB command is abnormal.
5 LED1
Not mounted.
6 LED2
Not mounted.
7 LED3
Not mounted.
VR
No. Name Function
1 VR1
For ADC (ADS7807) span correction*
2 VR2
For ADC (ADS7807) offset correction*
3 VR3 For adjustment of indicated temperature value
4 VR4 For adjustment of actual temperature in incubation bath
*) 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.
ADC - V EMIO100
A/D System Double integral type Sequential comparison type
Number of ADCs 2 pcs 1 pc
Number of channels 2 ch 4 ch (switching type)
Data averaging Analog averaging with
integration circuit
Averaging through continuous
measurements and calculation