Software Overview
41
SBOU123A – March 2012 – Revised September 2016
Copyright © 2012–2016, Texas Instruments Incorporated
XTR108EVM-USB Evaluation Board and Software Tutorial
5.4.1
DMM Connection
At startup, the XTR108EVM-USB software automatically detects if an Agilent 34401A multimeter is
connected over the GPIB-to-USB interface. If a 34401A is detected, the
DMM Connected?
LED turns on,
the
DMM Status
indicator displays the message
DMM detected. Proceed with Auto-Cal
, and the
Initiate
Auto-Cal
button is enabled. If a 34401A is not detected, the
DMM Connected?
LED remains off, the
DMM
Status
indicator displays the message
DMM not detected. Auto-Cal unavailable
, and the
Initiate Auto-Cal
button is disabled and grayed out. If the XTR108EVM-USB software does not detect a connected 34401A,
close the software, verify the hardware connections, check that the GPIB-to-USB controller is detected by
Windows, and then restart the software.
5.4.2
Step 1: Load Model File
Before calibration can take place, a model file must be loaded into the software. The XTR108EVM-USB
software automatically loads the most recent model file into memory at startup, but a different model file
can be selected by clicking the
Load Model File
button. The path of the loaded model file is shown in the
Model File
indicator.
5.4.3
Step 2: Select Channel
Use the
Channel to Calibrate
control to select which channel should be calibrated. Disabled channels in
the model file are grayed out and cannot be selected.
5.4.4
Step 3: Set RTD Emulator
The RTD emulator must be adjusted to match the resistance values shown in the
RTD_Min
,
RTD_Mid
,
and
RTD_Max
indicators. See
for detailed instructions on how to set the RTD
emulator. If the RTD emulator has already been configured in a previous step, this process can be
skipped.
5.4.5
Step 4: Initiate Auto-Cal
Click the
Initiate Auto-Cal
button to begin the automatic calibration procedure. Remember, this button
can only be enabled if the XTR108EVM-USB software has successfully detected an Agilent 34401A
connected over the GPIB-to-USB interface. During the automatic calibration procedure, the
Status
indicator displays the current calibration step, such as
Measuring Minimum-Scale Output
,
Performing
Second Corrections
, or
Calculating Error
.
