TB 9-4931-702-50
(2) Ensure that the sensitivity switch (B1) is open.
CAUTION
Avoid damaging or destroying the standard cell (A3) by
insuring that the TI output is set to the correct voltage and
adjusted as described in the procedure before operating the
sensitivity switch.
(3) Energize equipment and allow sufficient time for warm-up and stabilization.
(4) Set TI controls as follows:
(a) Set function selectors and ∆E controls to standard cell value recorded at
last calibration.
(b) Depress ARITH MEAN pushbutton.
(5) Check and record the deviation of the TI ARZTH MEAN output from value
recorded at last calibration. Deviation of the two values will be within 10 microvolts.
If not, the calibrations performed during the loop may be invalid. An explanation of
appropriate action taken will be recorded to verify loop completion.
NOTE
The values recorded during the loop closure check and
explanations of appropriate action taken with an out-of-
tolerance reading will be maintained for 3 years.
8. Linearity of Output Resistance Divider and Output Voltage Check (Model
730A)
a. Performance Check
(1) Connect equipment as shown in figure 2.
(2) Position TI controls as listed below:
(a) Supply No. 1 function switch to 10V and set ∆E control to the last 3 digits
of standard cell (A3) certified value.
(b) EXT COMPARISON/OUTPUT 1 depressed.
(3) Set voltage divider (A4) to 1.0000000.
(4) Set dc voltage standard (A1) to 10.999999.
(5) Operate dc voltage standard, sensitivity switch (B1), and null detector (A2) to
obtain null on null detector.
CHANGE 3
