prog.book : chapter1.fm 55 Mon Feb 15 09:24:37 1999
Power Meter Remote Operation
Setting Measurement Limits
HP E4418B/E4419B Programming Guide 1-55
190 ENTER @Power;B
200 PRINT A,B
210 END
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 1-4.
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. Refer to Chapter 8
“OUTput Subsystem” for TTL output programming commands and to the
HP E4418B/E4419B User’s Guide for connector and pin-out information.
Use the programming example for channel limits (page 1-54) as a guide to
programming window limits.
Checking for Limit Failures
There are two ways to check for limit failures:
1. Use the SENSe:LIMit:FAIL? and SENSe:LIMit:FCOunt?
commands for channel limits or the
Table 1-4: 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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