Figure 5-32.Effects of resistance on the rotation angle in medium 2 range.
HIGH RANGE.The high range is designed to test resistance values between 3K
W and 1MW.
Figure 5-33 shows the signatures that would be displayed for a 3KW resistor, a 50KW resistor, and a 1MW
resistor using the high range. Resistors that are smaller than 3KW will appear to be almost a vertical line.
A 50KW resistor will cause a change in the angle of rotation of 45º, whereas the display for a 1MW
resistor shows only a slight rotation that is very close to a horizontal line. Resistance values higher than
1MW will produce such a small rotation that it appears to be a horizontal line.
Figure 5-33.Effects of resistance on the rotation angle in high range.
When you test capacitors, the signature will be displayed as an ellipse. The size and shape of the
ellipse depend on the capacitor value, test signal frequency, and the selected impedance range. Figure 5-
34 shows the signature of a 0.22mF capacitor in each of the 12 combinations of range and frequency. As
you review this figure, you will notice that the signature appears to be an open circuit in the low range at
60 Hz; while in the high range at 2000 Hz, the signature appears to be a short. Between these, the
signatures displayed are a variety of ellipsoids, which demonstrates that certain range and frequency
combinations are better than others for examining a capacitor.