Analogue Output (Ao) Modules; Testing The Functioning Of Other Modules - Eaton Crouse-Hinds MTL5500 Series Instruction Manual

8 .4
The test compares the output current with the input current over the normal range of operation.
8 .4 .1
Input Conditions
The chosen "load" resistor can be any value between 100 and 800Ω.
Output Measurements
1.
2. The measured current imbalance (A2) over this range should not exceed ± 20mA.
8 .5
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
Make the safe- and hazardous-area connection shown in figure 8.12.
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.
65

Analogue Output (AO) Modules

Modules: All variants
470Ω
load
+
–
Adjust the current source to vary the current (A1) through the range 4 to 20mA.

Testing the functioning of other modules

Testing
Figure 8 .12: Test circuit for MTL5531
+
–
A1
A2
I
I
o
i
–
o/p i/p
+
Figure 8 .11: AO test circuit
+
current
source
–
INM 5500 Rev 11