HP E8402A, User And Service Manual, Page: 191 / 249

Calibrating and Verifying Performance 193 Chapter 4
Voltage
Monitor
Calibration &
Verification
To perform a complete Temperature Calibration or Verification, the mainframe must
be in the following state:
•
The mainframe should be under normal use conditions. This means that typical
VXI modules (VXI modules used in your test system) should be installed in
the mainframe.
•
Commands can be sent via the Enhanced Monitor’s RS-232 port or through a
command module or embedded controller.
•
Calibration includes: Calculating A/D offset and gain for each of the seven
VXI power supplies and externally applied voltages. Externally measured
voltages previously reported to the enhanced monitor through
CAL:VAL:VOLT are used for these calculations.
The CALibration:VALue:VOLTage command provides the enhanced monitor with
the externally measured voltages of the VXI power supplies measured at the
auxiliary connector of the mainframe. The value will be used to calibrate each power
supply-related measurement of the enhanced monitor.
To measure the power supply voltages, connect your DMM to the Diagnostic
Connector on the front panel of the VXI mainframe. Refer to Chapter 2, “Diagnostic
Connector” on page 42, for pinout information.
Note
Make certain you use the power supplies labeled "VM" on the Diagnostic
Connector. These are high impedance lines to the power supplies.
Table 4-2 lists the Diagnostic Connector pins to use for the power supply
measurements.
Table 4-2. Diagnostic Connector Pin Numbers
Power Supply Diagnostic Connector
Pin Number
+5 1
-12 2
-24 3
-2 4
+12 14
+24 15
-5.2 16