TB 9-4931-495-24
(6) Move positive lead to A2TP5 (fig. 3) and set ĆF pointer to the 5-V mark on
calibration scale. While rotating MANUAL control from fully cw to fully ccw position,
adjust J A2R49 (fig. 1) for test symmetry, i.e., same difference above and below 5.000 V dc.
(7) Rotate MANUAL control fully cw then fully ccw. If multimeter does not
indicate between -0.001 and +0.001 V dc at the ccw position and between +9.999 and
+10.001 V dc at the cw position, perform b (2) below.
b. Adjustments
(1) Adjust D A2R46 (fig. 1) for 0.000 V dc on multimeter (R).
(2) Adjust E A2R42 (fig. 1) for a 10.000 V dc indication on multimeter with
MANUAL control fully cw, and 0.000 V dc with MANUAL control fully ccw (R).
16. ĆF Operations (Model 8620A)
a. Performance Check
(1)
Connect multimeter between A2TP5 and A2 GND (fig. 2).
(2) Press CW pushbutton and set CW pointer to the 0-V mark on calibration scale
and make fine adjustment for 0 0.001 V dc.
(3) Press ĆF pushbutton and set ĆF multiplier switch to X1. Set ĆF pointer to the
5-V mark on calibration scale.
Set MODE switch to MANUAL and adjust MANUAL control for 0 0.001 V dc.
(4)
(5) Set ĆF pointer to the 0-V mark on calibration scale. If multimeter does not
indicate between -0.001 and +0.001 V dc, perform b (1) below.
(6) Set ĆF pointer to the 5-V mark on calibration scale. Adjust MANUAL control
fully cw. Note indication on multimeter.
(7) Adjust MANUAL control fully ccw. If multimeter does not indicate between
-0.001 and +0.001 V dc of indication noted in (6) above, but opposite polarity, perform b (2) below.
(8)
Repeat (5) through (7) above until voltages are equal in magnitude.
(9) Rotate MANUAL control fully cw, then fully ccw. If multimeter does not
indicate between -0.499 and -0.501 V dc at fully ccw and between +0.499 and +0.501 V dc at
fully cw, perform b (3) below.
b. Adjustments
(1) Adjust ĆF OFF A2R25 (fig. 2) for 0.000 V dc on multimeter (R).
(2) Adjust ĆF1 A2R5 (fig. 2) for 0.000 V dc on multimeter (R).
(3) Adjust ĆF2 A2R21 (fig. 2) for 0.500 V dc on multimeter (R).
