Direct Voltage Measurements - Navair 17-20VQ-05 Technical Manual

NAVAIR 17–20VQ–05
Unless otherwise specified, verify the results of each test and take corrective action whenever the test
requirement is not met before proceeding.
Zero test point measurements are to be verified only if an out of tolerance indication occurs at any test point
during calibration.

4.1 DIRECT VOLTAGE MEASUREMENTS

4.1.1 Connect the TI input to the calibrator output, observing correct polarity.
4.1.2 Set the TI controls to measure positive polarity dc voltage on the range most appropriate for testing linearity. (Usually
the 1 or 10 volt range.)
4.1.3 If a checklist is not provided for the TI, select five equally spaced calibration points compatible with the TI range and
available calibrator outputs. Set the calibrator V dc output multiplier switch decade to each calibration point and verify that at
each calibration point, the TI indication is within the TI tolerance limits specified by the manufacturer.
4.1.4 Set the calibrator V dc controls for minimum output.
4.1.5 Reverse the input leads to the TI for negative polarity.
4.1.6 Set the calibrator V dc output multiplier switch decade to the highest calibration point selected in step 4.1.3 (The TI
indication will be a negative value for the TI that has an auto polarity capability).
4.1.7 Set the calibrator V dc controls for minimum output.
4.1.8 Reverse the input leads to the TI for positive polarity.
4.1.9 Set the calibrator V dc controls for a voltage value at the highest compatible calibration point for each TI voltage
range. (TIs having voltage ranges above 100 V dc will be tested at 100 V dc). At each calibration point, verify that the TI
indication is within the TI tolerance limits specified by the manufacturer.
4.1.10 Set the calibrator V dc controls for minimum output.
Perform steps 4.1.11 to 4.1.14 only if the TI has a resolution of either 100 V, 10 V, or 1 V on the TI
lowest voltage range; for all others TIs, proceed to Section 4.2. The word "resolution" in the following test
measurements represents the lease significant digit (LSD) of the TI lowest voltage range.
4.1.11 Set the TI V dc controls to the lowest range.
4.1.12 Press the calibrator V switch, and adjust the calibrator V control to set the TI indication to 500 V.
4.1.13 Adjust the calibrator V control to increase the indication on the calibrator V indicator by twice the resolution of
the TI, and verify that the TI indication is within the TI tolerance limits specified by the manufacturer.
4.1.14 Adjust the calibrator V control to decrease the indication on the calibration V indicator by four times the
resolution of the TI, and verify that the TI indication is within the TI tolerance limits specified by the manufacturer.
4.1.15 Set the calibrator V dc controls for minimum output.
4
NOTES
NOTE