TB 9-6625-2246-40
(14) After reading has settled, operate sensitivity box L and H switches and null
meter RANGE switch while using calibrator output adjustment control to obtain best null
on null meter 10 V range.
(15) Record final calibrator output voltage indication as 100 V reference.
(16) Up-range null meter and set dc voltage divider dials to .0100000.
(17) Set calibrator output to 100 times dc reference standard 10 V output test report value.
(18) After reading has settled, operate sensitivity box L and H switches and null
meter RANGE switch while using calibrator output adjustment control to obtain best null
on null meter 10 V range.
(19) Record final calibrator output voltage indication as 1000 V reference.
(20) Up-range null meter and press calibrator RESET key.
(21) Disconnect dc reference standard, sensitivity box, and null meter from equipment
setup. Connect TI Input HI, LO, and Guard to dc voltage divider OUTPUT terminals.
(22) Set dc voltage divider dials to .0100000.
(23) Press keys as listed in (a) through (c) below:
(a) MENU Trig.
until TRIG AUTO is displayed.
(b) FUNCTION/RANGE Menu Scroll
(c) NUMERIC/USER Enter.
(24) Set calibrator output to value recorded as 10 V reference in (11) above.
key to 100 mV range. TI will indicate
(25) Press FUNCTION/RANGE Range
within 21.3 ppm of 0.01 times dc reference standard 10 V output test report value.
Example: Dc reference standard 10 V output test report value = 10.000055
0.01 times dc reference standard 10 V output test report value = .10000055
Tolerance: .10000055 X .0000213 = .000002130011715
Tolerance rounded to 8 digits: 0.00000213
100 mV lower limit = .10000055 -.00000213 = 099.99842 mV
100 mV upper limit = .10000055 +.00000213 = 100.00268 mV
key to 1 V range.
(26) Press FUNCTION/RANGE Range
(27) Set dc voltage divider dials to .1000000. TI will indicate within 11.1 ppm of 0.1
times dc reference standard 10 V output test report value.
(28) Press FUNCTION/RANGE Range key to 10 V range. TI will indicate within
13.0 ppm of 0.1 times dc reference standard 10 V output test report value.
(29) Reverse lead connections at dc voltage divider input terminals. TI will remain
within tolerance with a negative indication.
(30) Set dc voltage divider dials to .999999TEN. TI will have a negative indication
within 10.3 ppm of dc reference standard 10 V output test report value.
(31) Set calibrator to STANDBY; remove dc voltage divider from equipment setup,
connecting calibrator directly to TI.
11