Electronics; Amplifier Gain; Replacing The Battery - Datexx DS-700-30Xa Owner's Manual

Mode Press Display
DEG 0 [INV][x<–>m]
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
Calculate the value of Av
Voltage gain Av = 20 log Vo/Vi
= 20 log
= 69.54242509 dB
Press
3 [÷] [EXP] 3 [+/–]
[=] [log] [ ]
20 [=]
24
0
V0 = 3V
3
10 –3
1
Display
1. –03
3.477121255
69.54242509

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
389A 189
Maxell
LR1130
25