MobileView 7000 Series User Manual
17
The analog to digital converter on the recorder is a 12-bit device supporting up to 4096 separate set
points. Set points range from 0 to 4096 and correspond to an input voltage range of 0 to 30 VDC. If
the full-scale input voltage is less than 30 VDC, only a corresponding range of the 4096 set points are
available.
If the full-scale input is greater than 30 VDC, the input voltage must be reduced to a point within the
supported range. Use a voltage divider network to reduce voltage.
Voltage divider, analog input
In the previous figure, a certain amount of the input voltage (Vin) is used across resistor R1. The
remaining voltage (Vout) is routed and monitored by the analog input. The installer is responsible for
determining the proper values of R1 and R2 based on specified voltage input variables.
The value of VOUT is determined by the following formula.
Vout = (R2 * Vin) / (R1 + R2)
Since recorder analog inputs support a maximum voltage input of 30 VDC, VOUT is always 30 VDC.
For most applications, R2 is set to 10 kΩ and the value of Vin is the full scale value of the voltage
input to be measured. Solving the previous equation for variable R1 allows simple calculation of its
required value.
R1 = (R2 * Vin / Vout) - R2
In the previous example, to monitor a 40 VDC variable input using a recorder analog input would
require an R1 of 3.3 kΩ with an R2 of 10 kΩ.
R1 = (R2 * Vin / Vout) - R2
R1 = (10 k
Ω
* 40 VDC / 30 VDC) – 10 k
Ω
R1 = 3.3 k
Ω
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