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HP4402.book : chapter2.fm 46 Fri Feb 12 15:32:45 1999
Power Meter Operation
Setting Measurement Limits
2-46 HP E4419B User’s Guide
Setting Measurement Limits
You can configure the power meter to detect when a measurement is
outwith a predefined upper and/or lower limit value.
There are two types of measurement limits you can set:
• Channel Limits - are applied to the specified input channel and
are for power measurements only.
• Window Limits - are windows based (upper and lower) and can be
applied to power, ratio or difference measurements. In addition,
the window based limits can be set to output a TTL logic level at
the rear panel Rmt I/O port when the predefined limits are
exceeded.
Note Only one set of limits can be on at a time, that is, Channel OR
Window.
Setting Channel Limits
The power meter can be configured to verify the power being measured
against an upper and/or lower limit value. The range of values that can be
set for upper and lower limits is -150 dBm to 230 dBm. The default upper
limit is 90.00 dBm and the default lower limit is -90.00 dBm.
To set the limits:
1. Press , , . The current
setting of the maximum and minimum limits are displayed under
the and softkeys respectively.
2. To change either of these settings press the appropriate softkey.
The power meter displays the current value in a pop up window.
Modify this value (see below) until the desired value is displayed.
■ Use or to modify the digit on which the cursor is
currently positioned.
■ Use or to move to other digits.
3. To confirm your choice press the appropriate measurement units.
Limits can be disabled and re-enabled simply by pressing
.
A typical application for this feature is shown in Figure 2-11.
System
Inputs
A Input Settings Limits
Max Min
Limits Off On