TB 9-6695-293-50
NOTE
The 30 minute stabilization may only be required for the first
measurement. Afterwards allow at least 2 to 5 minutes after
each TI output frequency change before noting TI or ac
measurement standard indication.
NOTE
When SET REF is engaged the display shows the difference
between an applied input and the stored reference, or average
of references. The difference can be displayed in units of V (or
mV), ppm, percent, or ratio. Once a reference has been
established you can cycle through each choice by pressing any
of the three softkeys below the display. The display will cycle
through PPM (power on state), PCT, VOLTS, and RATIO,
and displays the equation used in each case.
f. Set TI for 10.0 A, 1.0 kHz ac output. Record ac measurement standard displayed
error indication in appropriate column of table 13.
g. Return to error corrected +10.0 A dc output that was set in c above and verify that
the ac measurement standard error display returns to a zero reading .0010 PCT within 1
to 3 minutes; if not, set a new reference on ac measurement standard by pressing CLEAR
REF INPUT 1 soft key, then press SET REF softkey. Repeat f above.
h. Algebraically add the ac measurement standard error indication recorded in f above
to the test reported ac-to-dc difference of the ac shunt. The result will be within the limits
specified.
i.
Repeat technique of
f and
g above for remaining frequencies listed in
table 13. At
each frequency, record the ac measurement standard error indication. Algebraically add
the resulting error indication to the associated test reported ac-to-dc difference of the ac
shunt. The result will be within the limits specified.
a. Deenergize and disconnect all equipment.
b. Annotate and affix DA label/form in accordance with TB 750-25.