Technical Specifications

186 | =GE Oil & Gas

Step Diagnostics

NOTE To perform any of the diagnostic tests on the Diagnostics screen

ESDVue must be in Setup mode. See “Change Mode” on page 83

for more information.

The Step Test produces a position vs. pressure graph where the valve is submitted to a

stepped input. The step profile may contain multiple steps. To run a step profile, you must

enter the starting position, the ending position, the pause between each step, the step size,

and whether or not to measure both up and down steps (one way or two way).

The step test starts at the starting position and makes steps according to the size specified in

step until the ending position is reached. For each step, the SVI II ESD measures the position at

even time intervals for the amount of time specified in time. If 2-way is specified, when the

end position is reached, the procedure is repeated from the end position to the start position.

To run the Step Test:

1. Adjust the following parameters, If necessary:

 Start Position (%)

 Stop Position (%)

 Time (s)

 Sample Rate (samples/s)

 Step Size (%)

 One Way or Two Way

2. Click Perform Step.

Running a Step Test

1. Enter the Start and Stop positions. The values must be between -5% and 105%. If you try

to enter other values an error message appears (Figure 177).

Figure 177 Start/Stop Error Message

2. Enter the Time/Sample Rate.

The Time (total amount of time sampling allowed for each step) multiplied by the Sample

Rate (number of samples per second) is the total number of samples and cannot exceed

400 or an error message appears (Figure 178).