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NI 9219 Calibration Procedure

Note

The excitation voltage on the NI 9219 may be off if the module is not

configured correctly. The excitation value on the NI 9219 should be at least 2.5 V.

f.

Clear the task.

5.

Set the voltage source to V

ExcitationModule

. Use the smallest available range needed to source

V

ExcitationModule

. Using a range larger than necessary creates unwanted additional noise.

6.

Connect the NI 9219 to DMM1, DMM2, and the source as shown in Figures 15 or 16 for
the appropriate test point value indicated in Table . Observe the following conditions when
connecting the equipment to the NI 9219.
•

Connect the leads of DMM1 as close as possible to the terminals on the NI 9219.

•

Connect the HI lead of DMM2 as close as possible to the same point that the HI lead
of the NI 9219 connects to the resistor network.

•

Connect the LO lead of DMM2 as close as possible to the same point that the LO lead
of the NI 9219 connects to the resistor network.

Figure 15.

Full-Bridge Accuracy Verification Connections to the NI 9219 (Configuration 2)

HI

LO

DMM2

HI

LO

DMM1

V+

V–

S

ource

10 k

Ω

± 1%

10 k

Ω

± 1%

NI 9219

EX+ (3)

HI (4)

LO (6)

EX– (5)

Ch

x

R

TestPoint

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Summary of Contents for NI 9219

Page 1: ... Accuracy Verification 11 Quarter Bridge Accuracy Verification 13 4 Wire Resistance Accuracy Verification 15 4 Wire RTD Accuracy Verification 17 3 Wire RTD Accuracy Verification 19 Half Bridge Accuracy Verification 22 Full Bridge Accuracy Verification 27 Adjustment 31 Voltage and Thermocouple Accuracy Adjustment 31 Current Accuracy Adjustment 32 4 Wire and 2 Wire Resistance Accuracy Adjustment 33 ...

Page 2: ...mended for the performance verification and adjustment procedures If the recommended equipment is not available select a substitute using the requirements listed in Table 1 NI cDAQ 9174 9178 USB Chassis Quick Start NI DAQmx installation and hardware setup NI 9219 Operating Instructions and Specifications NI 9219 specific information specifications and calibration interval NI DAQmx Readme Operating...

Page 3: ...500 nApkpk 0 1 Hz 10 Hz Half Bridge Accuracy Full Bridge Accuracy Use a voltage source with noise 500 μVpkpk 0 1 Hz 10 Hz at 3 V DMM x2 NI 4071 VoltageAccuracy Thermocouple Accuracy Use a DMM with 30 ppm uncertainty for voltage and 0 8 μV offset error in smallest range Resistance Accuracy RTD Accuracy Quarter Bridge Accuracy Use a DMM with 60 ppm uncertainty for resistance and 0 01 Ω offset error ...

Page 4: ...temperature will be greater than the ambient temperature Keep relative humidity below 80 Allow a warm up time of at least 10 minutes to ensure that the NI 9219 measurement circuitry is at a stable operating temperature Discrete Resistors RTD Accuracy TCR 10 ppm C Resistor values 4020 Ω 1 402 Ω 1 20 Ω 5 4 99 Ω 5 Resistance Accuracy TCR 10 ppm C Resistor values 8450 Ω 1 845 Ω 1 20 Ω 5 Quarter Bridge...

Page 5: ...s section provides instructions for verifying the NI 9219 specifications The following performance verification procedures describe the sequence of operation and test points required to verify the NI 9219 and assumes that adequate traceable uncertainties are available for the calibration references Caution The analog inputs on the NI 9219 are not grounded floating Ensure that a single point in the...

Page 6: ... in the lowest appropriate range according to the test point from Table 4 4 Enable Auto Zero on the DMM 5 Acquire a voltage reading with the DMM Record this measurement as Vref 6 Acquire and average samples a Create an AI voltage task on the NI 9219 according to Table 2 b Configure the AI voltage task timing according to Table 3 Table 2 NI 9219 Configuration for Voltage Accuracy Verification Measu...

Page 7: ...Mode Sample Timing Type High Resolution On Demand Table 4 NI 9219 Verification Test Limits for Voltage Accuracy Range Test Point 1 Year Limits Minimum V Maximum V Location Value V Lower Limit V Upper Limit V 60 60 Max 48 0 07990 0 07990 Mid 0 0 0 00100 0 00100 Min 48 0 07990 0 07990 15 15 Max 12 0 02030 0 02030 Mid 0 0 0 00080 0 00080 Min 12 0 02030 0 02030 4 4 Max 3 2 0 00580 0 00580 Mid 0 0 0 00...

Page 8: ...Figure 2 Figure 2 Thermocouple Accuracy Verification Connections to the NI 9219 2 Set the source to the appropriate test point value indicated in Table 7 Use the smallest available range needed to source each test point Using a range larger than necessary creates unwanted additional noise 3 Configure the DMM for a voltage measurement in the lowest appropriate range according to the test point from...

Page 9: ...imits listed in Table 7 are derived using the values in Table 53 10 Set the source output to zero 11 Repeat steps 2 through 10 for all test points on the NI 9219 12 Repeat steps 2 through 11 for all channels on the NI 9219 13 Disconnect the source and the DMM from the device Table 5 NI 9219 Configuration for Thermocouple Accuracy Verification Measurement Type Minimum C Maximum C Thermocouple 0 100...

Page 10: ... point Using a range larger than necessary creates unwanted additional noise 3 Configure the DMM for a current measurement in the lowest appropriate range according to the test point from Table 10 4 Enable Auto Zero on the DMM 5 Acquire and average samples a Create an AI current task on the NI 9219 according to Table 8 b Configure the AI current task timing according to Table 9 Table 8 NI 9219 Con...

Page 11: ...t and Lower Limit values in Table 10 Note The test limits listed in Table 10 are derived using the values in Table 53 8 Set the source to zero 9 Repeat steps 2 through 8 for all test points listed in Table 10 10 Repeat steps 2 through 9 for all channels listed on the NI 9219 11 Disconnect the source and the DMM from the device 2 Wire Resistance Accuracy Verification Complete the following steps to...

Page 12: ...ppropriate range according to the appropriate test point from Table 13 d Enable Auto Zero on the DMM e Acquire a resistance reading with the DMM Record this measurement as Ωref f Clear the task 3 Disconnect the DMM from the resistor to ensure that the terminals on the DMM do not interfere with the resistor while the NI 9219 makes measurements 4 Acquire and average samples a Create an AI resistance...

Page 13: ...n Complete the following steps to verify the quarter bridge accuracy of an NI 9219 1 Connect the NI 9219 to the resistor and the DMM as shown in Figure 5 Observe the following conditions when connecting the equipment to the NI 9219 Connect the leads of the DMM as close as possible to the terminals on the NI 9219 to ensure that the DMM reference measurements include the same lead wire resistance as...

Page 14: ...om the resistor to ensure that the terminals on the DMM do not interfere with the resistor while the NI 9219 makes measurements 4 Acquire and average samples a Create an AI bridge V V task on the NI 9219 according to Table 14 b Configure the AI bridge V V task timing according to Table 15 c Start the task d Acquire 20 unscaled I32 quarter bridge readings with the NI 9219 e Record the average of th...

Page 15: ...219 4 Wire Resistance Accuracy Verification Complete the following steps to verify the 4 wire resistance accuracy of an NI 9219 1 Connect the NI 9219 to the resistor and the DMM as shown in Figure 6 Connect the sense leads of the DMM as close as possible to the same point that the sense leads of the NI 9219 HI and LO connect to the resistor to ensure that the DMM reference measurements include the...

Page 16: ...DMM from the resistor to ensure that the terminals on the DMM do not interfere with the resistor while the NI 9219 makes measurements 4 Acquire and average samples a Create an AI resistance task on the NI 9219 according to Table 17 b Configure the AI resistance task timing according to Table 15 c Start the task d Acquire 20 4 wire resistance readings with the NI 9219 e Record the average of the re...

Page 17: ...1 Connect the NI 9219 to the resistor and the DMM as shown in Figure 7 Connect the sense leads of the DMM as close as possible to the same point that the sense leads of the NI 9219 HI and LO connect to the resistor to ensure that the DMM reference measurements include the same lead wire resistance as the NI 9219 4 wire measurements Figure 7 4 Wire RTD Accuracy Verification Connections to the NI 92...

Page 18: ... 9219 makes measurements 4 Acquire and average samples a Create an AI RTD task on the NI 9219 according to Table 20 b Configure the AI RTD task timing according to Table 15 c Start the task d Acquire 20 unscaled I32 4 wire readings with the NI 9219 e Record the average of the readings as dataunscaled f Clear the task 5 Scale the data by using the formula below to change the unscaled data into Ω wh...

Page 19: ... as shown in Figure 8 Connect the ΩHI and ΩsenseHI leads of the DMM directly to the spring terminal connector of the NI 9219 and the ΩLO and the ΩsenseLO leads of the DMM as close as possible to the same point where the LO lead from the NI 9219 connects to the resistor to ensure that the DMM reference measurements include the same lead wire resistance as the NI 9219 3 wire measurements Figure 8 3 ...

Page 20: ...from the NI 9219 connects to the resistor and the ΩLO and the ΩsenseLO leads of the DMM directly to the spring terminal connector of the NI 9219 Figure 9 3 Wire RTD Accuracy Verification Connections to the NI 9219 4 Acquire an ΩBottomHalfDMM measurement a Create an AI voltage task in the 1 V range on the NI 9219 b Commit the task to place the NI 9219 in voltage mode This prevents the module from i...

Page 21: ... rangemax is the maximum value for the selected range in Table 25 8 Perform the following calculation using the recorded Ωref and Ωchannel values 9 Compare the calculation result to the Upper Limit and Lower Limit values in Table 25 Table 23 NI 9219 Configuration for 3 Wire RTD Accuracy Verification Measurement Type Min C Max C Excitation Source Excitation Value Resistance Config r0 3 Wire RTD Pt1...

Page 22: ...e half bridge accuracy of an NI 9219 1 Connect the NI 9219 to DMM1 as shown in Figure 10 Figure 10 Half Bridge Accuracy Verification Connections to the NI 9219 Configuration 1 2 Configure DMM1 for a voltage measurement in the 10 V range 3 Enable Auto Zero on DMM1 4 Acquire a VExcitationModule measurement a Create an AI bridge V V task on the NI 9219 to Table 26 Mode Range Test Point 1 Year Limits ...

Page 23: ...Connect the NI 9219 to DMM1 DMM2 and the voltage source as shown in Figures 11 12 or 13 for the appropriate test point value indicated in Table 30 Observe the following conditions when connecting the equipment to the NI 9219 Connect the leads of DMM1 as close as possible to the terminals on the NI 9219 Connect the HI lead of DMM2 as close as possible to the same point that the HI lead of the NI 92...

Page 24: ...the NI 9219 Configuration 2 Figure 12 Half Bridge Accuracy Verification Connections to the NI 9219 Configuration 3 HI V LO DMM2 NI 9219 HI V LO DMM1 V V Source EX 3 HI 4 EX 5 Ch x 1 kΩ 1 1 kΩ 1 5 kΩ 1 5 kΩ 1 HI V LO DMM2 NI 9219 HI V LO DMM1 V V Source EX 3 HI 4 EX 5 Ch x 1 kΩ 1 1 kΩ 1 5 kΩ 1 5 kΩ 1 ...

Page 25: ...sk on the NI 9219 to Table 26 f Configure the AI bridge V V task timing according to Table 29 g Start the task h Acquire voltage measurements with both DMMs i Record the DMM1 measurements as VDMM1 Table 28 NI 9219 Configuration for Half Bridge Accuracy Verification Measurement Type Min V Max V Excitation Source Excitation Value Bridge Config Half Bridge 500 mV V 0 5 0 5 Internal 2 5 Half Bridge Ta...

Page 26: ...ed Ratioref and Ratiochannel values 10 Compare the calculation result to the Upper Limit and Lower Limit values in Table 30 Note The test limits listed in Table 30 are derived using the values in Table 53 11 Repeat steps 6 through 10 for all test points 12 Repeat steps 1 through 11 for all channels on the NI 9219 Table 30 NI 9219 Verification Test Limits for Half Bridge Accuracy Mode Range Test Po...

Page 27: ...ent a Create an AI bridge V V task on the NI 9219 to Table 31 b Configure the AI bridge V V task timing according to Table 32 c Start the task d Use DMM1 to measure the excitation voltage from the NI 9219 e Record this measurement as VExcitationModule Table 31 NI 9219 Configuration for Full Bridge Accuracy Verification Measurement Type Min V Max V Excitation Source Excitation Value Bridge Config F...

Page 28: ...s 15 or 16 for the appropriate test point value indicated in Table Observe the following conditions when connecting the equipment to the NI 9219 Connect the leads of DMM1 as close as possible to the terminals on the NI 9219 Connect the HI lead of DMM2 as close as possible to the same point that the HI lead of the NI 9219 connects to the resistor network Connect the LO lead of DMM2 as close as poss...

Page 29: ...AI bridge V V task on the NI 9219 to Table 33 f Configure the AI bridge V V task timing according to Table 34 g Start the task Table 33 NI 9219 Configuration for Full Bridge Accuracy Verification Measurement Type Min V Max V Excitation Source Excitation Value Bridge Config Full Bridge 62 5 mV V 0 0625 0 0625 Internal 2 5 Full Bridge Full Bridge 7 8 mV V 0 0078125 0 0078125 Table 34 NI 9219 Timing ...

Page 30: ...ion using the recorded Ratioref and Ratiochannel values 10 Compare the calculation result to the Upper Limit and Lower Limit values in Table 35 11 Repeat steps 6 through 10 for all test points 12 Repeat steps 1 through 11 for all channels on the NI 9219 Table 35 NI 9219 Verification Test Limits for Full Bridge Accuracy Mode Range Test Point 1 Year Limits Min mV V Max mV V Locati on Value Config Lo...

Page 31: ...ture in degrees Celsius d Call the NI 9219 get C Series adjustment points function to obtain an array of recommended calibration voltages for the NI 9219 e Set the source to a reference value determined by the array of recommended calibration voltages f Configure the DMM for a voltage measurement g Enable Auto Zero on the DMM h Acquire a voltage reading with the DMM i Call and configure the NI 921...

Page 32: ...ts function to obtain an array of recommended calibration currents for the NI 9219 f Set the source to a reference value determined by the array of recommended calibration current g Configure the DMM for a current measurement h Enable Auto Zero on the DMM i Acquire a current reading with the DMM j Call and configure the NI 9219 adjustment function according to Table 37 k Repeat steps e through i f...

Page 33: ...the NI 9219 setup calibration function to place the channel in resistance mode according to Table 41 c Input the external temperature in degrees Celsius d Call the NI 9219 get C Series adjustment points function to obtain an array of recommended calibration currents for the NI 9219 e Call and configure the NI 9219 setup calibration function to place the channel in voltage mode according to Table 3...

Page 34: ...ference measurements include the same lead wire resistance as the NI 9219 4 wire measurements 2 Adjust the NI 9219 4 Wire RTD 3 Wire RTD and Quarter Bridge accuracy a Initialize a calibration session on the NI 9219 The default password is NI b Call and configure the NI 9219 setup calibration function to place the channel in RTD mode according to Table 41 c Input the external temperature in degrees...

Page 35: ...3 for each channel on the NI 9219 Half Bridge Accuracy Adjustment Complete the following steps to adjust the half bridge accuracy of the NI 9219 1 Connect the NI 9219 to DMM1 as shown in Figure 10 2 Adjust the NI 9219 Half Bridge accuracy a Initialize a calibration session on the NI 9219 The default password is NI b Call and configure the NI 9219 setup calibration function to place the channel in ...

Page 36: ...nt that the HI lead of the NI 9219 connects to the resistor network Connect the LO lead of DMM2 as close as possible to the EX terminal of the NI 9219 j Configure DMM1 for a voltage measurement in the 10 V range k Enable Auto Zero on DMM1 l Configure DMM2 for a voltage measurement in the 10 V range m Enable Auto Zero on DMM2 n Acquire voltage measurements with both DMMs Perform the following calcu...

Page 37: ...the NI 9219 to DMM1 DMM2 and the voltage source as shown in Figures 15 or 16 for the appropriate test point value indicated in Table 33 Observe the following conditions when connecting the equipment to the NI 9219 Connect the leads of DMM1 as close as possible to the terminals on the NI 9219 Connect the HI lead of DMM2 as close as possible to the same point that the HI lead of the NI 9219 connects...

Page 38: ...o determine the As Left status of the device Note If any test fails Reverification after performing an adjustment verify that you have met the Test Conditions before returning your device to NI Refer to NI Services for assistance in returning the device to NI Accuracy Under Calibration Conditions The following accuracy table is valid for calibration under the following conditions Ambient temperatu...

Page 39: ...stance 1 kΩ 0 Ω 1 05 kΩ 771 474 4 Wire RTD Pt1000 0 Ω 5 05 kΩ 774 122 4 Wire RTD Pt100 0 Ω 505 Ω 764 947 3 Wire RTD Pt1000 0 Ω 5 05 kΩ 807 122 3 Wire RTD Pt100 0 Ω 505 Ω 797 951 2 Wire Resistance 10 kΩ 0 Ω 10 5 kΩ 776 61 2 Wire Resistance 1 kΩ 0 Ω 1 05 kΩ 771 475 Quarter Bridge 350 Ω 0 Ω 390 Ω 760 956 Quarter Bridge 120 Ω 0 Ω 150 Ω 734 1612 Half Bridge 500 mV V 500 mV V 500 mV V 93 205 Full Bridge...

Page 40: ... and how to obtain relevant HTS codes ECCNs and other import export data NI MAKES NO EXPRESS OR IMPLIED WARRANTIES AS TO THE ACCURACY OF THE INFORMATION CONTAINED HEREIN AND SHALL NOT BE LIABLE FOR ANY ERRORS U S Government Customers The data contained in this manual was developed at private expense and is subject to the applicable limited rights and restricted data rights as set forth in FAR 52 2...

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