Fluke 7350 specifications Menu Program Storing a Sequence in Memory, Preparing to Program

Local Operation 4

Menu

3.Use the numeric keypad to enter the new calibration password. Setting the calibration password to zero allows free access to Calibrator calibration and constants. Press

ENTER.

4.Press Yes [F4] to acknowledge changing the calibration password. Press No [F5] to reject changing the calibration password.

Menu Program — Storing A Sequence in Memory

Consider an exercise that requires the Calibrator to start at 30 psi, increase to 50 psi, then decrease to 20 psi. Test sequences like this may be stored in the Calibrator’s memory as a program.

One benefit of storing a sequence in memory is that the user does not have to command each pressure separately every time a multipoint test or calibration routine is performed. Another benefit is that the user can specify a tolerance for each set-point pressure. Once a tolerance is set, the dwell timer will start counting down instead of waiting until the pressure is at the exact set-point to start the dwell timer. This gives the user a time advantage compared to manual mode operation and provides a degree of automation without the use of an external computer.

Note

The Calibrator can store up to 1,000 program steps that may be divided among a maximum of 20 named programs.

Preparing to Program

Before entering a test sequence, consider the items discussed below.

Program Name

Valid program names range from one to eight characters in length and can include numbers, upper case letters, and the /, %, and # symbols. For example, Exer#14 and %FS test are both valid names.

Configuration

Since a program will depend on the current setup of the Calibrator (the current configuration is stored with the program) the user should set the units, limits, control parameters, etc., to the desired values before creating a program.

Number of Set-points

Before entering the sequence, the user should determine the number of upscale and downscale set-points required to complete the exercise.

Set-point Pressure and Tolerance

Each set-point in the program requires both a pressure and a tolerance, in the current units of measure. For example, one set-point might require a tolerance as low as 0.05 psi

(0.35 kPa), whereas another set-point in the same program could be satisfied with a tolerance as high as 5 psi (0.35 kPa).

Dwell Time

Once the pressure is within the specified tolerance, the Calibrator starts a timer that runs for a user-defined number of seconds. This is referred to as dwell time. As long as this timer is running, the Calibrator will remain at the designated set-point unless the max time (see below) elapses. When the dwell time expires, the Calibrator will proceed to the next step. Typically the dwell time should be set to a value less than the max time.

Usually dwell time has a value of a few seconds, but a value of 0 can be used to create a pause in the program. When the dwell time is set to zero, the Calibrator switches to manual control once it is within the tolerance value of the set-point pressure. The user must then press a key on the front panel to continue the program.

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