Using the SCC-AO10
This section contains information regarding scaling voltage measurements and isolated ground references.
Scaling Voltage Measurements
The SCC-AO10 is a ±10 V isolated analog output module. The output voltage is controlled by an E/M Series DAQ device AO output channel, AO (X). The relationship between the AO (X) voltage level and the output voltage level of the SCC-AO10 is a one-to-one linear relationship. That is,
VAO(X) = VAO10
where
VAO(X) is the AO 0 voltage level
VAO10 is the SCC-AO10 voltage output in volts
Isolated Ground Reference
Each SCC-AO10 module is referenced to its own isolated ground. Each isolated ground can have up to 60 VDC of common-mode voltage between itself and any other channel ground or chassis ground. Refer to the Connecting the SCC-AO10 to a Load section for ways to use the isolated ground in signal connections.
Calibrating Gain and Offset Errors
The SCC-AO10 is calibrated at the factory before shipment. To adjust the gain and offset of the SCC-AO10 in your system using an E/M Series DAQ device, you need a voltage meter and a 1/8 in. flathead screwdriver. Before adjusting the SCC-AO10, allow 30 minutes for the DAQ device to warm up to its nominal operating temperature.
To adjust the gain and offset of the SCC-AO10, complete the following steps:
1.Disconnect the load from the SCC-AO10 you want to calibrate.
2.Set an output range of –10 to +10 V for AO (X), the E/M Series DAQ device channel connected to the SCC-AO10.
3.Connect the negative lead of the voltmeter to the isolated ground terminal (pin 1) and the positive lead to the voltage output terminal (pin 2 or 3) of the SCC-AO10.
4.Using your software, set AO (X) to output 0 VDC.
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