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Phase Accuracy
Phase Accuracy - Continued

Calibration Rrocedure For Vector Voltmeter, Me-512/U And Models 8405A And 8405A-H16 Page Navigation
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TB 9-6625-2213-24
(23) Adjust signal generator amplitude controls for a TI meter indication of 100 mV.
If PHASE meter does not indicate between -4.5 and +4.5 degrees, perform b below.
(24) Disconnect signal generator from equipment setup and connect signal generator
to frequency counter.
(25) Adjust signal generator frequency controls for a frequency counter indication of
100.000 MHz.
(26) Connect equipment as shown in figure 5, CONNECTION B.
(27) Set PHASE METER OFFSET switch to 90 and adjust FREQ RANGE-MHz
control for a dial indication which includes 100.
(28) Set PHASE METER OFFSET + - switch to -.
(29) Adjust signal generator amplitude controls for a TI meter indication of 100 mV.
If PHASE meter does not indicate between -4.5 and +4.5 degrees, repeat (12) through
(19) above.
b. Adjustments
(1) Press and release LINE PUSH ON/OFF to OFF. Remove TI top cover.
(2) Remove A26 EXTENDER (fig. 4) and A8 ASSY boards (fig. 4). Plug A8 ASSY
into extender board and plug extender board into A8 ASSY board slot in chassis.
(3) Unplug A3, A4, A10, and A11 ASSY boards (fig. 4).
(4) Connect equipment as shown in figure 6.
Figure 6. Phase meter adjustments - equipment setup.
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