National Instruments 446 Series, Calibration Procedure, Page: 10 / 42

NI 446X Calibration Procedure 10 ni.com
Calibration Process
This section provides instructions for verifying and calibrating the NI 446 X
device.
Calibration Process Overview
The calibration process consists of the following steps:
1. Initial Setup—Configure the device in NI-DAQmx.
2. Self-Calibration —Measure the onboard reference voltage of the
device and adjust the self-calibration constants.
3. NI 446X Verification Procedure —Verify the accuracy of the device
prior to calibration.
4. NI 446X Adjustment Procedure —Perform an external calibration that
adjusts the device calibration constants with respect to known voltage
and frequency sources.
5. Perform another verification to ensure that the device operates with the
specifications after adjustment.
The self-calibration, verification, and adjustment procedures are explained
in the following sections.
Note You must compare the verification limits provided in this procedure with the most
recent specifications. Refer to the latest NI 446 X device specifications at
ni.com/manuals
.
Initial Setup
NI-DAQmx automatically detects all NI 446 X devices. However, for the
driver to communicate with the device, you must configure the device in
NI-DAQmx.
Complete the following steps to configure a device in NI-DAQmx:
1. Install the NI-DAQmx driver software.
2. Power off the computer that will hold the device and install the device
in an available slot.
3. Power on the computer and launch MAX.
4. Right-click the device name and select Self-Test to ensure that the
device is working properly.
Note When a device is configured with MAX, it is assigned a device name. Each function
call uses this device name to determine which DAQ device to calibrate. This document
uses
dev1
to refer to the device name. In the following procedures, use the device name as
it appears in MAX.