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Operating Instructions - CPA2501
Air Data Test Indicator
CPA2501
5.4.3 Qc Reference Port
The reference port is available on Qc units. This port must be connected to the Ps pressure side, or both
open to atmosphere for an accurate Qc reading . This is due to the common mode correction. The correc-
tion is used to remove offsets of both zero and span when the reference pressure is changed. The correc-
tion utilizes the Ps channel’s pressure value. In a Ps/Pt transducer, this port is plugged.
5.5 Remote Communication Connections
See Section 7, Remote Operation, for connections and commands for operation over IEEE-488, Ether-
net, USB or RS-232 ports.
5.6 Power Up
Apply power to the power connector on the rear of the instrument using the power adaptor included, and
switch the power switch on the front of the unit ON. The instrument will go through an initialization pro-
cess and system check. As soon as the system check is completed the system will default to a screen
similar to the one shown in Section 6.1.2 - Display Screen Features. The main measurement screen may
be configured in many different ways but initially it will be in a default configuration. Subsequently, the unit
will power up in the configuration that it was in when last powered off. Allow at least 15 minutes of warm
up before performing critical pressure measurements.