PM9110BFE Ver la hoja de datos (PDF) - South African Micro Electronic Systems
Número de pieza
componentes Descripción
Fabricante
PM9110BFE
South African Micro Electronic Systems
PM9110BFE Datasheet PDF : 14 Pages
| |||
PM9110BF
Scroll Facility
The 4 registers may be sequentially displayed by activating the scroll button. The
contents of the register selected for display is retained on the display for a period
of 10 seconds, provided that the push button is not activated during this period. After
the 10 seconds has elapsed, the display defaults to the "active" register defined by
the status of the tariff DIP switches.
The register selected for display via the scroll button is indicated by the relevant
announciatiors.
Reset Function
By pressing the Reset button the contents of the RAM of the SA9110A device is set
to the default conditions.
Jumpers J8, J9 and J10 must be removed to use this feature.
It is strongly recommended that the provision of this facility is not made available
on production meters.
9. Circuit Description
The module is supplied from an external 5V DC supply.
The most important external components are:
C7, C9, C10 and C11 are the outer loop capacitors for the integrated oversampling
A/D converters. The typical value of C7 is 2.2nF and the value of C9, C10 and C11
is 560pF.
The actual values determine signal to noise and stability performance. The
tolerances should be within ± 10%.
C4, C5, C6 and C8 are the inner loop capacitors for the integrated oversampling A/
D converters. The typical value of C4, C5, C6 and C8 is 3.3nF. Values smaller than
0.5nF and larger than 5nF should be avoided.
Terminated current sensors (current transformers) are connected to the current
sensor inputs of the SA9110A through current setting resistors (R8..R13).
The resistor values should be selected for an input current of 16µARMS into the
SA9110A at the rated line current.
6/14
sames
Share Link: