Specifications

Disabling the Input
Protect Feature
(Optional)
Disabling the Input Protect feature voids the VT1419A’s warranty. The Input
Protect feature allows the VT1419A to open all channel input relays if any input’s
voltage exceeds ±19 volts (±6 volts for non-isolated digital I/O SCPs). This feature
helps to protect the card’s Signal Conditioning Plug-Ons, input multiplexer, ranging
amplifier and A/D from destructive voltage levels. The level that trips the protection
function has been set to provide a high probability of protection. The voltage level
that is certain to cause damage is somewhat higher. If, in an application, the
importance of completing a measurement run outweighs the added risk of
damage to the VT1419A, the input protect feature may be disabled.
VOIDS WARRANTY Disabling the Input Protection Feature voids the VT1419A’s warranty.
To disable the Input Protection feature, locate and cut JM2202. Make a single cut in
the jumper and bend the adjacent ends apart. See following illustration for location
of JM2202.
Disabling Flash
Memory Access
(Optional)
The Flash Memory Protect Jumper (JM2201) is shipped in the “PROG” position. It
is recommended that the jumper be left in this position so that all of the calibration
commands can function. Changing the jumper to the protect position prevents the
following from being executed:
·
The SCPI calibration command CAL:STORE ADC | TARE
·
The register-based calibration commands STORECAL and STORETAR
·
Any application that installs firmware-updates or makes any other
modification to flash memory through the A24 window.
With the jumper in the “PROG” position, one or more VT1419As can be
completely calibrated without being removed from the application system. A
VT1419A calibrated in its working environment will, in general, be better
calibrated than if it were calibrated separate from its application system.
The multimeter used during the periodic calibration cycle should be considered the
calibration transfer standard. Provide the Calibration Organization control
unauthorized access to its calibration constants. See the VT1415A/VT1419A Service
Manual for complete information on VT1419A periodic calibration.
If access to the VT1419A’s calibration constants must be limited, place JM2201 in
the protected position and cover the shield retaining screws with calibration
stickers. See following illustration for location of JM2201.
Getting Started
Configuring the VT1419A
Chapter 1 21
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