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National Instruments PXI-4110, Процедура калибровки

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NI PXI-4110 Calibration Procedure

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© National Instruments

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19

Verifying Line Regulation

Complete the line regulation test to verify that the output voltage falls within specified limits 
when the line voltage coming from the auxiliary power supply changes or that the output current 
falls within specified limits when the line voltage changes. Each test requires a variable auxiliary 
power supply to vary the line voltage or current. An NI APS-4100 is not sufficient for verifying 
line regulation because the output voltage is fixed. Run this test only after the 

Verifying Voltage Measurement Accuracy

 and 

Verifying Current Measurement Accuracy

 tests 

pass.

Voltage Line Regulation

To verify voltage line regulation, use the NI 4110 in Constant Voltage mode and confirm that 
the output voltage change falls within calculated limits while varying the line voltage using a 
variable power supply. Table 14 lists the voltage values and measurements needed to complete 
verification. Refer to Figure 6 for the necessary connections.

Figure 6.  

Voltage Line Regulation Verification Connection Diagram

NI PXI-4110

+

–

HI

LO

DMM

Volt

a

ge

Mode

V

a

ri

ab

le Power

Su

pply

+

–

AUX IN +

AUX IN –

Содержание PXI-4110

Страница 1: ...st Equipment 4 Test Conditions 4 Calibration Procedures 5 Initial Setup 5 Verification 6 Verifying Voltage Programming Accuracy 7 Verifying Voltage Measurement Accuracy 8 Verifying Current Programming...

Страница 2: ...Calibration File Locations NI DCPower 1 0 or Later File Name and Location Description IVI Bin nidcpower_32 dll NI DCPower driver containing the entire NI DCPower API including calibration functions I...

Страница 3: ...You can shorten this calibration interval based on the accuracy demands of your application Refer to the Where to Go for Support section for more information NI PXI 4110 Getting Started Guide Contains...

Страница 4: ...ween 10 and 90 noncondensing Maintain an ambient temperature of 23 C 10 C for verification procedures and an ambient temperature of 23 C 1 C for adjustment procedures Allow a warm up time of at least...

Страница 5: ...date on the EEPROM to allow traceability 4 Reverification Repeat the verification procedure to ensure that the device is operating within its specifications after adjustment These steps are described...

Страница 6: ...e following NI 4110 specifications Voltage programming accuracy Voltage measurement accuracy Current programming accuracy Current measurement accuracy Voltage load regulation Current load regulation V...

Страница 7: ...cation Take voltage measurements using the DMM at each voltage test point and compare the reading with the value from the Output column of Table 5 Verify that the measurement error falls between the t...

Страница 8: ...Take voltage measurements using the DMM at each test point and then take voltage measurements using the NI 4110 at each test point Compare the two values Verify that the measurement error falls betwee...

Страница 9: ...6 are derived from the voltage measurement accuracy specifications plus an offset voltage Table 6 NI 4110 Output Parameters and Test Limits for Voltage Measurement Accuracy Verification Channel Itera...

Страница 10: ...nel x in Table 4 Table 7 lists the voltage test points and external load settings that you must measure in DC Voltage mode for each current range to complete verification For example the 1 A range req...

Страница 11: ...ication Channel s Output V Current Range Iteration Equivalent Resistance Output A Test Limit A 0 6 1 A 1 150 0 020000 0 004030 2 12 0 250000 0 004375 3 6 0 500000 0 004750 4 4 0 750000 0 006063 5 3 1...

Страница 12: ...liary power supply for this verification procedure Refer to the following figure for the necessary connections Figure 3 Current Measurement Connection Diagram 2 16 20 mA 1 25 000 0 000400 0 000060 2 2...

Страница 13: ...to settle wait three seconds after requesting a new current before taking a measurement with the DMM and the NI 4110 Verify that the measurement error falls between the absolute limits listed in the T...

Страница 14: ...gulation Verification steps Connect the NI APS 4100 to the Aux Power Input connections for load regulation tests 1 2 20 mA 1 open 0 0 000012 0 000035 2 1 000 5 0 000020 0 000043 3 1 000 10 0 000027 0...

Страница 15: ...e R1 to the specified channel of the NI 4110 2 While taking a current measurement with the NI 4110 I1 use the DMM to measure the voltage across the output of the NI 4110 V1 3 Change the load from R1 t...

Страница 16: ...I 4110 Voltage Load Regulation Verification Points Channel VRange I Range ILimit V Level Load R1 Load R2 Measured Voltage Change Limit V Voltage Change V I1 mA V1 V I2 mA V2 V 0 6 V 1 A 1 A 6 V 620 7...

Страница 17: ...oltage measurement with the NI 4110 V1 use the DMM in series to measure the output current I1 3 Change the load from R1 to R2 and repeat the previous step 4 For each test the units for all current mea...

Страница 18: ...fication Points Channel VRange I Range VLimit I Level Load R1 Load R2 Measured Current Change Limit A Current Change A I1 A V1 V I2 A V2 V 0 6 V 1 A 6 V 500 mA 10 4 1 20 V 20 mA 20 V 10 mA 1 8 k 200 1...

Страница 19: ...line regulation because the output voltage is fixed Run this test only after the Verifying Voltage Measurement Accuracy and Verifying Current Measurement Accuracy tests pass Voltage Line Regulation To...

Страница 20: ...V1 4 Change the external variable power supply voltage from Vext1 to Vext2 and repeat the previous step 5 Record the NI 4110 output voltage measurements for both external voltages 6 Calculate the Volt...

Страница 21: ...ents 21 Table 14 NI 4110 Voltage Line Regulation Verification Points Channel V Range I Range I Limit V Level Vext1 Vext2 Measured Voltage Change Limit V Voltage Change V V1 V V2 V 1 20 V 1 A 100 mA 10...

Страница 22: ...the NI 4110 to output the current specified in Table 15 3 Use the DMM to measure the current across the output of the specified channel of the NI 4110 I1 4 Change the external variable power supply vo...

Страница 23: ...ed specifications and adjustment is optional Table 16 NI 4110 Current Line Regulation Verification Points Channel V Range I Range V Limit I Level Vext1 Vext2 Measured Current Change Limit A Current Ch...

Страница 24: ...components of the NI DCPower API require that you program the NI 4110 using the voltage output and current output functions You must adjust each range with a separate call to the appropriate niDCPower...

Страница 25: ...lar output or measurement mode refer to the example programs installed with NI DCPower 3 Call niDCPower Cal Adjust function s When the measurements required for adjustment of a range are complete call...

Страница 26: ...had adequate time to settle wait one second after requesting a new voltage before taking a measurement with the DMM Use the niDCPower Cal Adjust Voltage Level VI niDCPower_CalAdjustVoltageLevel functi...

Страница 27: ...To ensure the system has had adequate time to settle wait one second after requesting a new voltage before taking a measurement with the DMM and the NI 4110 Use the niDCPower Cal Adjust Voltage Measu...

Страница 28: ...second after requesting a new voltage before taking a measurement with the DMM Use the niDCPower Cal Adjust Current Limit VI niDCPower_CalAdjustCurrentLimit function to calculate the new calibration...

Страница 29: ...ts Pass the current values reported by the NI 4110 to the Reported Outputs input of the VI and pass the voltage values measured by the DMM to the Measured Outputs input of the VI Call this VI or funct...

Страница 30: ...e NI 4110 successfully passes all verification tests calibration is complete Where to Go for Support The National Instruments website is your complete resource for technical support At ni com support...

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