2 Power Meter Operation
72 E4418B Power Meter User’s Guide
Setting Window Limits
The power meter can be configured to verify the current measurement in
either window against predefined upper and/or lower limit values. The
range of values that can be set for the upper and lower limits and the
default values depends on the measurement units in the currently selected
window, see
Table 2- 6.
The window based limits can also be set to output a TTL logic level at the
rear panel Rmt I/O port when the predefined limits are exceeded. You can
switch the rear panel TTL outputs, on, or off; set the TTL output level to
active high or low; and determine whether the TTL output represents an
over limit condition, under limit condition or both.
The TTL connector is an RJ- 45 Series shielded modular jack assembly
with the TTL output pins connected as shown in
Figure 2- 13.
Tab l e 2 - 6 Range of Values for Window Limits
Window Units Max Min Default
MaxMin
dB +200 dB –180 dB 60 dB –120 dB
dBm +230 dBm –150 dBm 90 dBm –90 dBm
% 10.0 Z% 100.0 a% 100.0 M% 100.0 p%
W 100.000 XW 1.000 aW 1.000 MW 1.000 pW
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