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REPLACING THE BATTERY
If the calculator slows down when using the battery, the
battery is weak and should be replaced.
1. Remove the 6 screws on the bottom panel and
remove the panel.
2. Remove the old batteries.
3. Insert the new batteries
(Radio Shack type RS-389 Cat. No. 23-101)
following the polarity of the old battery.
4. Replace the bottom panel and replace the screws.
Replacement Batteries
Radio
Shack Eveready Maxell
389A 189 LR1130
25
Mode Press Display
DEG 0 [INV][x<–>m] 0
6 [∏] 6
15 [=] 0.4
[INV] [sin
– 1
] 23.57817848
[Min] M 23.57817848
90 [–] [MR] [=] M 66.42182152
0 [INV][x<–>m]23.57817848
23.58 [cos] 0.916502421
[¥] 15 [=] 13.74753633
ELECTRONICS
AMPLIFIER GAIN
Vi = 1mV V0 = 3V
Calculate the value of Av
Voltage gain Av = 20 log Vo/Vi
= 20 log
3
1 ¥ 10
–3
= 69.54242509 dB
Press Display
3 [∏] [EXP] 3 [+/–] 1. –03
[=] [log] [¥] 3.477121255
20 [=] 69.54242509
24