Martel Electronics BetaGauge 3II - Manual (Page 158)

7-17 Doc. Cal. Mode
System Prompt. This section first prompts you to zero
the display for channel 1, then follows with channel 2.
Menu Items. The menu items (Ready and Zero) that
appear at the bottom of the screen allow you to zero the
display for the current channel or bypass the zeroing
operation for the current channel.
Zeroing the Display Readings
From the Zero screen, use the following procedure to
zero the display readings of the installed modules prior
to starting a test.
CAUTION: Use the following practices to ensure that
an offset does not occur when you initiate
a zero sequence:
Zeroing a Pressure Module. Ensure that
the module is vented to the atmosphere
prior to initiating the zero sequence.
Zeroing a Current Input. Ensure that
the milliamp inputs are open.
Zeroing a Voltage Input. Ensure that
the voltage input is shorted.
1. Do one of the following:
 To zero the module display of channel 1, press
the function button corresponding to the Zero
menu item. Proceed to step 2.
 To bypass the zeroing option for channel 1,
press the function button corresponding to the
Ready menu item. Proceed to step 2.