Operator Manual
The following Test are provided on the
Table
Test Point | Function |
TP1 | Electrometer Output |
TP2 | Analog +5 VDC supply |
TP3 | - 5 VDC supply |
TP4 | Digital +5 VDC supply (From |
TP5 | High Voltage Sense (Not Used) |
TP6 | + 12 VDC supply (From |
TP7 | DC Ground |
TP8 | Programmable Gain Amplifier Output |
TP9 | Microprocessor Clock Signal |
TP10 | Chip Enable - EPROM |
2.4 977-210-10M Interface Board
Refer to the Communications Interface, P/N
U2 and U3 are, respectively, the receiver and driver circuits for the RS232 port. U14 decodes address block A000 to provide chip enables to the ACIA switch input register U6.
Regulated power for the electronics (+/- 12 VDC) is derived from three terminal regulators VR3 and VR4. The ±5 Vdc logic power is derived from the three terminal regulators VR1 and VR2.
Power for the detector is normally provided by the electronic high voltage power supply in the associated Model
The following LEDs are provided to indicate operation of certain functions of the
Table | ||
LED # |
| Indicates |
LED1 |
| +15 VDC is being supplied to the circuit board |
|
| from the UDR when ON |
LED2 |
| Communications – Receive; |
|
| ON (bright): both + 15 and |
|
| present |
|
| ON (dim): Only one loop supply present |
|
| OFF: no loop voltage from either supply |
The following Test are provided on the
Table
Test Point | Function |
TP2 | RS232 Transmit |