INM 5500 Rev 11
65
8 .4 Analogue Output (AO) Modules
The test compares the output current with the input current over the normal range of operation.
8 .4 .1 Modules: All variants
Input Conditions
The chosen “load” resistor can be any value between 100 and 800Ω.
Figure 8 .11: AO test circuit
Output Measurements
1. Adjust the current source to vary the current (A1) through the range 4 to 20mA.
2. The measured current imbalance (A2) over this range should not exceed ± 20mA.
8 .5 Testing the functioning of other modules
Simple tests to verify their basic operation can be devised for other modules (e.g. temperature,
pulse, vibration, etc). If any assistance is required for the testing of a particular module, please
contact the technical support department at Eaton for advice.
8 .5 .1 Testing
Make the safe- and hazardous-area connection shown in figure 8.12.
Figure 8 .12: Test circuit for MTL5531
Measure the voltage on terminal 3 with respect to terminal 1; this should be >19V. Vary the
potentiometer setting and check that the reading on voltmeter V varies by no more than
±100mV.
+
–
+
–
A2
+
–
A1
o/p
i/p
current
source
+
–
470
Ω
load
I
o
I
i
