TB 9-6625-1188-24
(3) Adjust R48 CAL ADJ (R69 CAL ADJ) (fig. 1) until meter indicates 100 mA dc (R).
10. Power Supply
NOTE
Do not perform power supply check if all other parameters are
within tolerance.
a. Performance Check
(1) Connect multimeter positive lead to any red lead on TERMINAL BOARD C (F)
(fig. 3) and negative lead to chassis ground. If multimeter does not indicate between +274.4
and +285.6 (+266 and +278) V dc, perform b below.
Figure 3. Dc milliammeter - left-side view.
NOTE
Steps (2) and (3) below are for model 428B only.
(2) Connect multimeter positive lead to pin 2 of V11 (fig. 3) and negative lead to
chassis ground. Multimeter will indicate between +11 and +13 Vdc.
(3) Move positive lead to anode of CR9 (fig. 3). Multimeter will indicate between
-6.0 and -8.0 V dc.
b. Adjustments. Adjust ADJ +280V, R83 (ADJ +272V, R109) (fig. 3) for +280
(+272) Vdc indication on multimeter (R).
