Martel Electronics DPC300A - Manual (Page 27)

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5. Minimum and Maximum Storage Capability
The 300 Series Pressure Calibrators have a min/max feature for
capturing the minimum and maximum values of any displayed
parameter.
The min/max function can be accessed by stepping through the menu
options until “min/max” is shown on the display above the F1 key. At
this time, pressing the F1 key will toggle the display through the min/
max values that are stored in the min/max registers. These readings
are live so that the new min/max values will be recorded while in this
mode.
To reset the min/max registers simply press the clear key. These
registers are also cleared at power-up or when the configuration is
changed.