National Instruments NI TB-4300B Manual

CALIBRATION PROCEDURE
NI TB-4300B
This document contains information about verifying National Instruments TB-4300B terminal
blocks. For more information about calibration, visit ni.com/calibration.
Contents
Software Requirements............................................................................................................. 1
Documentation Requirements .................................................................................................. 1
Calibration Interval................................................................................................................... 1
Test Equipment......................................................................................................................... 2
Test Conditions......................................................................................................................... 2
Verification Procedure.............................................................................................................. 3
Where to Go for Support .......................................................................................................... 8
Software Requirements
No other software is required to verify the operation of the TB-4300B. All of the information
necessary to verify this terminal block is located in this calibration procedure.
Documentation Requirements
You may find the following document useful for reference. You can download the latest version
of this document from the NI Web site at ni.com/manuals.
• The NI SC Express 4300 Installation Guide and Terminal Block Specifications provides
instructions for installing and configuring the NI PXIe-4300 module and TB-4300/4300B
and includes terminal block specifications.
Calibration Interval
National Instruments recommends a calibration interval of five years for the TB-4300B. Verify
at the recommended interval based on the measurement accuracy demands of your application.

2|ni.com |NI TB-4300B Calibration Procedure
Test Equipment
National Instruments recommends that you use the instruments in Table 1 for adjusting and
verifying a TB-4300B.
Test Conditions
The following setup and environmental conditions are required to ensure the terminal block
meets published specifications.
• Keep connections to the device as short as possible. Long cables and wires can act as
antennae, which can pick up extra noise that affects measurements.
• Verify that all connections to the device are secure.
• Maintain the ambient temperature between 20 °C and 30 °C.
• Keep relative humidity below 80%.
• Allow at least 15 minutes warm-up time to ensure that the measurement circuitry is at a
stable operating temperature.
• Use shielded copper wire for all cable connections to the device. Use twisted-pair wire to
eliminate noise and thermal offsets.
Table 1. Recommended Equipment
Equipment
Recommended
Model Requirements
Calibrator Fluke 5700A If this instrument is unavailable, use a
high-precision voltage source with an accuracy of at
least 10 ppm for adjustment and at least 40 ppm for
verification. The source needs an output impedance
of less than or equal to 50 Ω.
DMM NI 4070 If this instrument is unavailable, use a multiranging
6½ digit DMM with an accuracy of at least 40 ppm
and an input impedance of >10 GΩ.
Connection
Accessory
CAL-4300B Fixture required for verification of the TB-4300B.

NI TB-4300B Calibration Procedure |© National Instruments |3
Verification Procedure
Complete the following steps to verify the attenuation ratio of the TB-4300B:
1. Loosen the top cover captive screws and remove the top cover while referring to Figure 1.
2. Remove the strain relief screws and the strain relief.
Figure 1. TB-4300B/CAL-4300B Assembly
Caution Make sure the TB-4300B has three keys installed in its connector and that
none of the keys are loose. The keying locations are shown in Figure 2. If any of the
three keys are missing or loose, refer to the Where to Go for Support section for
assistance in returning the terminal block to NI.
1 Top Cover Captive Screws
2TopCover
3 Strain Relief Screws
4 Strain Relief
5 TB-4300B
6 CAL-4300B
1
1
2
5
4
6
3

4|ni.com |NI TB-4300B Calibration Procedure
Figure 2. TB-4300B Connector Key Locations
3. Connect the TB-4300B to the CAL-4300B by aligning the connectors and pressing them
together until they are seated.
1 Key Locations
1
1

NI TB-4300B Calibration Procedure |© National Instruments |5
4. Connect the calibrator to the TB-4300B as shown in Figure 3.
5. Replace and secure the strain relief and top cover.
Figure 3. TB-4300B Verification Input Measurement Wiring Diagram
6. Set the calibrator to 60 V. Refer to Table 2 for Lower and Upper Limits.
7. After enabling the calibrator, allow the TB-4300B to warm up for a minimum of
15 minutes.
1 CAL-4300B
2 TB-4300B
3 To Calibrator +
4 To Calibrator –
AI2+ AI2– COM2 AI3+ AI3– COM3 AI0+ AI0– COM0 AI1+ AI1– COM1 AI4+ AI4– COM4 AI5+ AI5– COM5 AI6+ AI6– COM6 AI7+ AI7– COM7 PFI0 PFI1
RP1 RP2
R2R1 R4R3R4R3 R6R5 R8R7
RP3R10R9
R12R11
RP4R14R13
R16R15
RP5
R18R17 R20R19
RP6 RP7R26R25
R28
R27
RP8R30R29
R32R3R31 R22R21 R24
R23
FOR PATENTS: NI.COM/PATENTS
N114
1
2
4
3

6|ni.com |NI TB-4300B Calibration Procedure
8. Connect the DMM to the output of AI0 on the CAL-4300B as shown in Figure 4. The
output voltage will be 1/30 of the input voltage; therefore, you must change the DMM range
accordingly.
Figure 4. TB-4300B Verification Output Measurement Wiring Diagram
1 To DMM –
2 To DMM +
3 CAL-4300B
4 TB-4300B
5 To Calibrator +
6 To Calibrator –
AI2+ AI2– COM2 AI3+ AI3– COM3 AI0+ AI0– COM0 AI1+ AI1– COM1 AI4+ AI4– COM4 AI5+ AI5– COM5 AI6+ AI6– COM6 AI7+ AI7– COM7 PFI0 PFI1
RP1 RP2
R2R1 R4R3R4R3 R6R5 R8R7
RP3R10R9
R12R11
RP4R14R13
R16R15
RP5
R18R17 R20R19
RP6 RP7R26R25
R28
R27
RP8R30R29
R32R3R31 R22R21 R24
R23
F O R PAT E N T S: NI.COM/PATENTS
N114
3
4
12
6
5

NI TB-4300B Calibration Procedure |© National Instruments |7
Note If using an NI DMM or a DMM with a selectable impedance, set the input
impedance to >10 GΩ.
9. Measure the voltage output on the CAL-4300B using the DMM. Use Table 2 to verify that
the channel is within the limits.
If the temperature is outside those found in Table 2, you can calculate the lower and upper
limits as follows:
where Vin is the input voltage of 60 V.
Δt is the absolute temperature difference between the ambient temperature
and 25 °C.
10. Disconnect the DMM and connect it to the next channel.
11. Repeat steps 9 through 10 for all channels.
If the verification procedure determines that the TB-4300B is outside of the specifications, refer
to Where to Go for Support for assistance in returning the terminal block to NI.
Table 2. TB-4300B Test Limits
Voltage Lower Limit (V) Upper Limit (V)
60 1.998646 2.000689
Note: These limits assume the ambient temperature is between 20 °C and 30 °C and that the input
voltages are exactly as stated. If this is not the case, refer to the following text to calculate the limits. The
values were derived from information available in the NI PXIe-4300 and TB-4300B Installation Guide
and Terminal Block Specifications document.
LowerLimit
Vin
30.019601 0.000146Δt+
------------------------------------------------------------=
UpperLimit
Vin
29.990401 0.000146Δt–
------------------------------------------------------------=

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373549B-01 Aug12
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