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round. The notch on the chip is to the left, next to the display. Modules
have the notch indicated in a white rectangle. The notch is next to the
capacitor marked C1.
·
Check the position of the two jumpers to the left of the chip, just above
the larger chip. For 64K memory the two jumpers should link the right
hand two pins. For 260K memory the two jumpers should link the left
hand two pins. For RAM modules, use the 64K option.
·
Temporarily replace the two cells, or plug in an external supply. The
display should come on and will indicate the memory size.
·
Replace the top half of the case and the two side pieces, remove the
two cells and insert the four screws.
·
Replace the two cells and fit battery cover.
To check:
·
Press
Function
to enable display
·
Press
Select
button once. The bottom line of the display will indicate
free memory now available.
*Early loggers prior to 2004 were supplied with 64K reading memory; this
can be upgraded to 260K reading memory by installing chip only. Current
standard memory is 260K reading memory. Increasing memory to 500K or
1,000,000 or 2,000,000 reading memory is by substituting chip with
appropriate module.
12.10 Sensor supply voltage
The Squirrel is shipped with the sensor supply voltage selector jumpers all
set to 9V. If 5V ±0.1% is required to power a sensor, then an internal
jumper needs to be moved. For more information on the sensor supply,
see section 4.10.4.
The method for removing the top of the case is detailed above, in section
12.8,
and the same cautions apply
. All boards down to the one that
needs the adjustment will need to be removed. The sensor power jumpers
should always cover two of the three pins, and are usually situated close
the input connectors. The appropriate jumper needs to be moved to
connect the middle pin to the other edge pin. The boards must then be
reassembled in the correct order, taking great care to align all of the pins
on the internal connectors. Care should be taken to replace the hexagonal
spacers in their correct positions
– they are of different lengths for
different positions.
