Monarch Instrument DC 2000 - Manual (Page 90)

Page 5-24
Chapter 5 Programming
Current Inputs Voltage Shunt - Current inputs are converted to voltage by means of an external 50 ohm shunt
resistor supplied by the user. The following formula is used to determine the appropriate low and high end input
voltage for non-standard current inputs:
Ohms Law: E = I * R
E = Equivalent voltage inputs
I = Current in milliamps
R = Precision shunt resistance value
Shunt Resistor Example - The following example shows a low and high end input voltage for a 0 to 1mA input
with a precision shunt resistance of 1000 ohms with the measurement done on the 1.25V range.
E = 0 x 1000 = 0mV = 0 V (Low input)
E = 1 x 1000 = 1000mV = 1 V (High input)
Using the Input and Output scaling, the user can program full scale ranges for the above input.
Programming Parameters - Once a point has been programmed as Linear and a current or voltage mode
selected, the user is presented with the following parameters:
Point Tag Section 5.6.5.1
Input Scale Section 5.6.5.2
Output Scale Section 5.6.5.3
Exc. Currents Section 5.6.5.5
Filter Seconds Section 5.6.5.6
Engineering Units Section 5.6.5.9
Alarm Setpoints Section 5.6.5.10
Chart Scale Section 5.6.5.11
Not all the above options will be available. It depends on the choice of input range.
5.6.7 Dry Contact Point Type
The Dry Contact Point Range type allows a point to be programmed and act like an open or closed contact.
The input can be a set of potential free contacts. Logically an open contact is equal to 0 (zero) and a closed
contact is equal to 1.
Once a point has been selected as Linear as described above (5.6.6) use the UP (
↑) or DOWN (↓) Arrow Keys
to highlight “Dry contact” as the linear type and press ENTER. The display will show a reduced Point Setup
menu - the Dry Contact Point Setup Menu. The user can then set the following parameters:
Point tag Section 5.6.5.1
Eng units Section 5.6.5.9
Alarms Section 5.6.5.10
Chart Scale Section 5.6.5.11