HP4402.book : chapter2.fm 45 Thu Feb 11 15:53:59 1999
Power Meter Operation
Setting Measurement Limits
HP E4418B User’s Guide 2-45
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.
Table 2-6: Range of Values for Window Limits
Window
Units
Max Min
Default
Max Min
dB +200 dB -180 dB 60 dB -120 dB
dBm +230 dBm -150 dBm 90 dBm -90 dBm
% 999.9 X% 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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