Diagnostic LED
The G448 is equipped with a dual function LED signal monitor. The green, front mounted LED indicates both DC power and input signal status. Active DC power is indicated by an illuminated LED. If the input signal is more than 110% of the full scale range, the LED will flash at 8Hz. Below -10%, the flash rate is 4Hz.

Configuration
The G448 has 11 input range switch settings. Trim potentiometers allow 50% input zero and span adjustablity within each of the 11 full-scale, input ranges.

For example, the 200mV switch setting in Table 1 configures the input for a 0 to 200mV range. Since the span can be contracted by 50%, this enables an input span as narrow as 100mV of the range, or 50%. This span can be positioned anywhere within the 0-200mV range with a zero off-set as large as 50% of the full scale range (e.g. 100 to 200mV input).

Unless otherwise specified, the factory presets the Model G448 as follows:

The DC power input accepts any DC source between 18 and 30V, typically a 24VDC source is used (see Accessories).

For other I/O ranges refer to Tables 1 through 4 and reconfigure switches SW1 and SW2 for the desired input range, function, excitation and output range.

1. After configuring the DIP switches, connect the input to a calibrated millivolt source. Connect the output to the device (or a load equivalent to the device) and apply power. (see Wiring Diagram, Figure 2 or 3).
2. Set the calibrator to the desired minimum and adjust the zero potentiometer for the desired minimum output.
3. Set the calibrator to the desired maximum and adjust the span potentiometer for the desired maximum output.
4. Repeat steps 2 and 3, if necessary for best accuracy.