TB 9-6625-2074-24
(9) Adjust calibrator controls for an output of 1.0 V ac and adjust R353 (fig. 2) for
ME-526/USM (Boonton, Model 92BD with serial number 2890 and below), or R179 (fig. 3
for Boonton, Model 92B) for a TI indication between 980 and 1020 mV (ideal 1000 mV) (R).
(10) Adjust calibrator controls for an output of 3.0 V ac and adjust R363 (fig. 2) for
ME-526/USM (Boonton, Model 92BD with serial number 2890 and below) (fig. 3 for
Boonton, Model 92B) for a TI indication between 2940 and 3060 mV (ideal 3000 mV) (R).
9. Power Supply
NOTE
Do not perform power supply check if all other parameters are
within tolerance.
a. Performance Check
(1) Connect multimeter to -15 V dc test point located on main amplifier board (fig. 2)
for ME-526/USM (Boonton, Model 92BD with serial number 2890 and below) (fig. 3 for
Boonton, Model 92B). If multimeter does not indicate between -14.9 and - 15.1 V dc,
perform b (1) below.
(2) Connect multimeter to +15 V dc test point located on main amplifier board (fig.
Boonton, Model 92B). If multimeter does not indicate between +14.9 and +15.1 V dc,
perform b (2) below.
b. Adjustments
(1) Adjust R143 (fig. 2) for ME-526/USM (Boonton, Model 92BD with serial number
2890 and below) (fig. 3 for Boonton, Model 92B) for a -15.0 V dc multimeter indication (R).
(2) Adjust R140 (fig. 2) for ME-526/USM (Boonton, Model 92BD with serial number
2890 and below) (fig. 3 for Boonton, Model 92B) for a +15.0 V dc multimeter indication (R).
10. Final Procedure
a. Deenergize and disconnect all equipment.
b. Annotate and affix DA label/form in accordance with TB 750-25.