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IM133, Page
The “Function LED” corresponding to the Input Select function will remain OFF or ON during the
normal mode of operation if the user selected the “Chrg” or “Volt” setting respectively.
2. Current Excitation
This function is used for setting the excitation current connected at the ISOTRON (Voltage) input.
This setting is applied to all three (3) channels simultaneously (each channel can not have
its own setting). The up-down EDIT push buttons are used to select the excitation current level
in mA. The following messages will be shown sequentially on the LED display each time the up-
down EDIT push buttons are pressed: (1) “0.0”, (2) “4.0” and (2) “10.0”.
1. "0.0": Excitation current disabled.
2. "4.0": Excitation current set to 4.0 mA.
3. "10.0": Excitation current set to 10.0 mA.
The “Function LED” corresponding to the Current Excitation function will remain OFF during the
normal mode of operation if the user selected the “0.0” setting (excitation current disabled). The
function LED will remain ON if the excitation current was enabled by selecting any of the other
settings listed in the table above.
3. Sensor Sensitivity
This function selection provides for programming the sensitivity of the transducer (in mV/EU for
Voltage input, or pC/EU for Charge input). The Endevco Model 133 uses this information to
determine the gain needed to achieve the required output scaling. The left-right EDIT push buttons
select the number position in the LED display, and the up-down EDIT push buttons increment or
decrement the selected number.
The user can enter four significant digits ranging from 0.001 to 9999.
4. Output Scaling
This function selection provides for programming the desired scaling of the amplifier’s output (in
mV/EU). The left-right EDIT push-buttons select the number position in the LED display, and the
up-down EDIT push-buttons increment or decrement the selected number. The Endevco Model
133 determines the gain needed to achieve the required output scaling by using the following
equation:
Amplifier’s Gain = Output Scaling / Sensor Sensitivity
The gain of the amplifier will be set to within the resolution specified in the Performance
Specification. The entry in Output Scaling depends on the Sensor Sensitivity setting and it will
automatically change to the lowest or highest limit if the current entry violates the following
constraint:
0 < Output Scaling / Sensor Sensitivity < 1000
The user can enter four significant digits ranging from 0.001 to 9999 limited by the above constraint.
The “Function LED” corresponding to the Output Scaling function will be set to OFF when the unit
returns to the normal mode of operation.
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