pico ADC-10/12/40/42 user manual
Version 1.0 Page 7
7 Scaling
PicoScope and PicoLog automatically convert the readings from the ADCs
into voltages. If, however, you use the drivers, it is necessary to convert
the readings within your program.
The ADC-10 is an 8-bit unipolar analog to digital converter. This means
that it produces values in the range 0 to 255 to represent voltages between
0 and 5 volts. To convert from ADC readings to Volts, you should multiply
by 5 and divide by 255. Thus, an ADC reading of 132 represents 132 x 5
/ 255 = 2.588 Volts.
The ADC-12 is a 12-bit unipolar analog to digital converter. This means
that it produces values in the range 0 to 4095 to represent voltages
between 0 and 5 volts. To convert from ADC readings to Volts, you should
multiply by 5 and divide by 4095. Thus, an ADC reading of 132 represents
132 x 5 / 4095 = 0.1612 Volts.
The ADC-40 is an 8-bit bipolar analog to digital converter. This means that
it produces values in the range 0 to 255 to represent voltages between -5
and +5 volts. 128 represents zero volts. To convert from ADC readings to
Volts, you should subtract 128, then multiply by 5 and divide by 128. Thus,
an ADC reading of 132 represents ((132-128) x 5 )/128 = 0.156 Volts.
The ADC-42 is a 12-bit bipolar analog to digital converter. This means that
it produces values in the range 0 to 4095 to represent voltages between -5
and +5 volts. 2048 represents 0 volts. To convert from ADC readings to
Volts, you should subtract 2048, then multiply by 5 and divide by 2048.
Thus, an ADC reading of 132 represents ((132-2048) x 5) / 2048 = -4.677
Volts.
pico ADC-10/12/40/42 user manual
Page 8 Version 1.0
8 Picolog support for ADC-10/12/40/42
This section covers the functions of PicoLog which are specific to the ADC-
10, ADC-12, ADC-40 and ADC-42. This description refers to the ADC-10
only, but the same procedures apply for the other ADCs.
It describes:
Cedit ADC-10 setup: specify which printer port the ADC-10 is
connected to
CDisplay voltages: display the parameters that can be measured
using the ADC-10
CAdd or edit channel: specify details for a channel
8.1 Edit ADC-10 setup
?4444U
EDIT ADC-10 SETUP
44444@
*
*
*
Printer port: LPT1
*
*
*
B4444444444444444444444444444A
This option is used to specify which printer port the ADC-10 is connected
to. The port must be LPT1..LPT3.
