HP HP-67

90 Function Keys
Example: In the schematic diagram below, X;, is 12 kilohms, E is
120 volts, and f is 60 Hz. Find the inductance of the coil L in henries
XL
27f
according to the formula: L =
L= X _ 12,000
27f 2 X 7 X 60
Press Display
12 G533 3 12000.00
28 6000.00
0@nE 1909.86
60 £ Henries.
Percentages
The key is a two-number function which allows you to compute
percentages. To find the percentage of a number:
1. Key in the base number.
2. Press EUED.
3. Key in the number representing percent rate.
4. Press Tl ).
The formula used is:——2 = %.
100