TB 9-6625-2143-24
Input mode switch to UNBAL.
(g)
RESOLUTION BANDWIDTH control to 300 Hz.
(h)
DISPLAY SMOOTHING control to MIN.
(i)
SWEEP MODE control to OFF.
(j)
(4) Set synthesizer level generator output to 10 kHz and -6.99 dBm (0.1 V rms).
(5) Adjust FREQUENCY control for indication near 10,000 Hz and press
AFC pushbutton.
(6) Set front panel CAL 10 kHz control fully ccw.
(7) Connect multimeter to A4TP1 (fig. 1). Record ac voltage indication on multimeter.
(8) Adjust front panel CAL 10 kHz control for multimeter indication 1.26 times the
value recorded in (7) above (see table 7).
Table 7. Gain and Linearity Adjustments
Test instrument
100 mV x 1.26 = 126 mV
117 mV x 1.26 = 147 mV
101 mV x 1.26 = 127 mV
118 mV x 1.26 = 149 mV
102 mV x 1.26 = 129 mV
119 mV x 1.26 = 150 mV
103 mV x 1.26 = 130 mV
120 mV x 1.26 = 151 mV
104 mV x 1.26 = 131 mV
121 mV x 1.26 = 152 mV
105 mV x 1.26 = 132 mV
122 mV x 1.26 = 154 mV
106 mV x 1.26 = 134 mV
123 mV x 1.26 = 155 mV
107 mV x 1.26 = 135 mV
124 mV x 1.26 = 158 mV
108 mV x 1.26 - 136 mV
125 mV x 1.26 = 158 mV
109 mV x 1.26 = 137 mV
126 mV x 1.26 = 159 mV
110 mV x 1.26 = 139 mV
127 mV x 1.26 - 160 mV
111 mV x 1.26 = 140 mV
128 mV x 1.26 = 161 mV
112 mV x 1.26 = 141 mV
129 mV x 1.26 = 163 mV
113 mV x 1.26 = 142 mV
130 mV x 1.26 = 164 mV
114 mV x 1.26 = 144 mV
131 mV x 1.26 = 165 mV
115 mV x 1.26 = 145 mV
132 mV x 1.26 = 166 mV
116 mV x 1.26 = 146 mV
133 mV x 1.26 = 168 mV
(9) Disconnect multimeter.
(10) Adjust VERNIER (amplitude) control for midscale indication on TI.
(11) Using non-metallic alignment tool, adjust A4L1 (fig. 1) for peak meter indication
on TI. (R)
(12) Set POWER switch to off, replace A4 board and set POWER switch to on.
(13) If AFC is unlocked, release AFC.
(14) Set amplitude VERNIER control to CAL (fully cw) position.
(15) Connect multimeter to RECORDER Y-axis output (rear panel).
(16) Disconnect synthesizer level generator from TI INPUT and adjust A4R11 (fig. 1)
for multimeter of 0 + 0.001 V dc. (R)
(17) Reconnect synthesizer level generator to TI INPUT, and set synthesizer level
generator amplitude to -7.45 dBm.
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