User's Manual

NI 4070/4072 Calibration Procedure 30 ni.com

57. Call niDMM_Read. Subtract the previously calculated 100 Ω range

offset from this measurement. Verify that the result falls between the

tolerances listed in Table 18.

You have completed verifying the 2-wire resistance of the NI 4070/4072.

Select one of the following options:

• If you want to continue verifying other modes, go to the Verifying DC

Current section.

• If you do not want to verify other modes and you are performing a

post-adjustment verification, go to the Completing the Adjustment

Procedures section.

• If you do not want to verify any additional modes and you are

performing a pre-adjustment verification, call

niDMM_close to close

the session.

Verifying DC Current

To verify the DC current of the NI 4070/4072, complete the following steps:

1. Reset the calibrator.

2. Fasten the connectors on one end of the Fluke 5440 cable to the

NI 4070/4072 HI SENSE and LO banana plug connectors, and connect

the connectors on the other end of the cable to the HI and LO calibrator

binding posts. Figure 3 shows the correct connections. Table 9 lists the

cable connections.

Figure 3. Cable Connections for Current

1 NI 4070/4072 2 Fluke 5700A/5720A Calibrator 3 Fluke 5440 Cable

300V

MAX

AUX

I/O

1A, 250V

MAX

300V

MAX

AMPS

INPUT

SENSE

W 4W

6½-Digit FlexDMM

CAT II

SENSE

VΩ

OUTPUT

VΩA

AUX

CURRENT

GUARD GROUND