Chapter 2 General Information 21
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The reference voltages of both D/A CH1 and CH2 are external:
The reference of D/A CH1 is internal and that of CH2 is external:
2.2.8 D/A Internal Reference Selection (JP8)
The internal reference voltage can be -5V or -10V. It is selected
by JP8. The reference voltage is -10V and the D/A output range
is 0 to +10V:
The reference voltage is -5V and the D/A output range is 0 to
+5V:
The internal reference is used only when the jumper JP3 or JP4 is
set to INT.
2.2.9 A/D Maximum Input Voltage Selection (JP9)
The A/D converter range can be +/- 5V or +/- 10V at it is
selected by jumper JP9. If JP9 is set in the +/- 5V range, the
analog input ranges of PCL-812PG are +/- 5V, +/- 2.5 V, +/-
1.25V, +/- 0.625V and +/- 0.3125V. If JP9 is set to the +/- 10V
range, the analog input ranges are then +/- 10V, +/- 5V, +/- 2.5V,
+/- 1.25V and +/- 0.625V. The default setting of JP9 is the +/-
5V range. The user can set JP9 to +/- 10V to double the input
range.
Some PC power supplies offer the bias voltage Vcc + with a
voltage less than +12V, e.g. +11.2V. In this case, the output
voltage swing range of the programmable amplifier cannot reach
+10V and the A/D converter CANNOT make correct
measurement if JP9 is set to +/- 10V range.
A/D converter maximum input range is +/- 10V:
2.3 Connector Pin Assignment
The PCL-812PG is equipped with two 20-pin insulation
displacement (mass termination) connectors, accessible from the
rear plate, and three other 20-pin insulation displacement
connectors on-board. All these connectors can be connected to
the same type of flat cables, or connected to 37-pin D-type
