Model 7700 Multiplexer Module Instructions for use with DAQ6510
077144300 / April 2018 13
Make sure that you perform the verification tests using the following conditions:
Under the proper environmental conditions.
After the specified warm-up period.
With connections made to the correct input terminals.
Using the correct line voltage.
With the TERMINALS switch in the REAR position.
With the proper calibration equipment and the reading limits provided with the verification procedures. See
Calculating resistance reading limits (on page 13
) for more information.
Environmental conditions
Conduct your performance verification procedures in a test environment that has:
An ambient temperature of 18 °C to 28 °C.
A relative humidity of less than 80% unless otherwise noted.
Warm-up period
Allow the DAQ6510 to warm up for at least one hour before verifying the module.
If the instrument has been subjected to temperature extremes (those outside the ranges stated above), allow
additional time for the internal temperature of the instrument to stabilize. Typically, allow one extra hour to
stabilize an instrument that is 10 °C outside the specified temperature range.
Allow the test equipment to warm up for the minimum time specified by the manufacturer.
Example reading limit calculation
The following is an example of how reading limits have been calculated. Assume you are testing the 10 VDC
range using a 10 V input value. Using the DAQ6510 one-year accuracy specification for 10 VDC of ± (25 ppm
of reading + 5 ppm of range), the calculated limits are:
Reading limits = 10 V ± [(10 V × 25 ppm) + (10 V × 5 ppm)]
Reading limits = 10 V ± (0.00025 + 0.00005)
Reading limits = 10 V ± 0.00030 V
Reading limits = 9.99970 V to 10.00030 V
Calculating resistance reading limits
Resistance reading limits must be recalculated based on the actual calibration resistance values supplied by
the equipment manufacturer. Calculations are performed in the same manner as shown in the previous
example, except that you should use the actual calibration resistance values instead of the nominal values
when performing your calculations.
For example, assume that you are testing the 10 kΩ range using an actual 10.03 kΩ calibration resistance
value. Using DAQ6510 one-year 10 kΩ range accuracy of ± (75 ppm of reading + 6 ppm of range), the
calculated reading limits are:
Reading limits = 10.03 kΩ ± [(10.03 kΩ × 75 ppm) + (10 kΩ × 6 ppm)]
Reading limits = 10.02929 kΩ to 10.03081 kΩ
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