112 8163A/B, 8164A/B, 8166A/B User’s Guide
3 Power Measurement
Figure 64 Out of Range - Power Greater Than Upper Power Limit
If the measured power is more than 40 dBm less than the range setting, it
is impossible for power to be displayed. The power value, -1.--- dBm, as
shown in Figure 65 on page -113, is shown. This means that the measured
power is greater than the resolution at this [Range] value. You must
increase the [Range] value.
See Table 11 on page -114 for more details.