National Instruments NI PXIe-1075 - Manual (Page 32)

Chapter 2 Installation and Configuration
NI PXIe-1075 User Manual 2-12 ni.com
You can use a digital voltmeter to ensure all voltage levels in the
NI PXIe-1075 chassis are within the allowable limits. Referring to
Table 2-2, connect one lead of the voltmeter to a supply pin on the remote
voltage monitoring connector (9-pin D-SUB) on the rear panel. Refer to
Table 2-1 for a pinout diagram of the remote voltage monitoring connector.
Connect the reference lead of the voltmeter to one of the ground pins.
Compare each voltage reading to the values listed in Table 2-2.
Note Use the rear-panel 9-pin D-SUB connector to check voltages only. Do not use the
connector to supply power to external devices.
If the voltages fall within the specified ranges, the chassis complies with the
CompactPCI voltage-limit specifications.
Inhibit Mode Switch
On the rear panel of the chassis there is an Inhibit Mode switch. Refer to
Figure 1-2,
Rear View of the NI PXIe-1075 Chassis , for the location. The
Inhibit Mode switch is recessed to prevent it from accidentally being
switched.
The Inhibit Mode switch should be in the Default position when you want
the system controller to control the power supply inhibit. If the user needs
to power on a chassis without a system controller installed the switch
should be in the Manual position.
When the Inhibit Mode switch is set to the Manual position, the power
supplies are enabled, and you can use the Inhibit signal (active low) on
pin 5 of the Remote Inhibit and Voltage Monitoring connector to power off
the chassis. To remotely power off the chassis, connect the Inhibit pin
Table 2-2. Power Supply Voltages at Voltage Monitoring Connector (DB-9)
Pin Supply Acceptable Voltage Range
2 +5 V 4.75 to 5.25 V
4 +3.3 V 3.135 to 3.465 V
6 +12 V 11.4 to 12.6 V
8 –12 V –12.6 to –11.4 V
1, 9 Logic Ground 0 V