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Calibration Description
The Cal connector on the front panel of the standard VT1433B can be configured
(in software) as either an input or an output. It can be set to any of four
settings:
q
DC - The VT1433B outputs a DC calibration signal from the millivolt range up to
15 volts.
q
AC - The VT1433B outputs a signal from an Arbitrary Source option (in the same
module or a different VT1433B module in the system.)
q
Ground - The connector is shunted to ground for a zero-volt reference.
q
Open Circuit - In this mode the connector becomes an input which can receive a
calibration signal up to ±15 volts.
The VT1433B is calibrated at the factory and the calibration placed in EPROM
memory for use at each power-up. In addition an auto-zero function is provided.
VT1433B User's Guide
Module Description
5-15
VT1433A Substrate
Front panel connecto
r
Input Circuitry
DC Voltage
Reference
CALIN
CALOUT
VXI SUMBUS
to ADC
from
DC_BUS
Source
from
Output
Tachometer
trigger
monitor
Figure 5-6: Calibration block diagram