TB 9-6625-2072-24
(5) Set oscilloscope calibrator for a 1 V output. Set HORIZONTAL MAGNIFIER
switch to X10. Rotate oscilloscope calibrator knob located below EDIT FIELD button to
adjust for 10 divisions of horizontal deflection on TI. If oscilloscope calibrator err readout
does not indicate within 5 percent, perform b (5) and (6) below.
b. Adjustments
(1) Adjust oscilloscope calibrator output for 0 percent on err readout.
(2) Adjust R250 (R36 for models 180C and D) X1 GAIN ADJ (fig. 1) for 10 divisions
of deflection on TI.
(3) Adjust oscilloscope calibrator output for 0 percent on err readout.
(4) Adjust R248 (R34 for models 180C and D) X5 GAIN ADJ (fig. 1) for 10 divisions
of deflection on TI.
(5) Adjust oscilloscope calibrator output for 0 percent on err readout.
(6) Adjust R246 (R32 for models 180C and D) X10 GAIN ADJ (fig. 1) for 10
divisions of deflection on TI.
a. Performance Check
(1) Connect oscilloscope calibrator SOURCE/MEASURE CHAN 1 to
HORIZONTAL EXT INPUT.
(2) Set oscilloscope calibrator for a 50 kHz LEVEL SINE output and adjust output
amplitude for 10 divisions of horizontal deflection on TI.
(3) Increase oscilloscope calibrator frequency to 5 MHz. TI display will be at least
7.1 divisions.
b. Adjustments. No adjustments can be made.
11. Low Voltage Power Supply
a. Performance Check
NOTE
Do not perform power supply checks if all other parameters are
within tolerance.
NOTE
Perform (1) through (4) below for all models except 180C and
180D. For models 180C and 180D, perform (5) through (8)
below.
(1) Connect multimeter between TP404 (fig. 1) and chassis ground. If multimeter
does not indicate between -99.90 and -100.10 V, perform b (1) below.