Keysight N9038A Demo Guide

25 | Keysight | N9038A MXE EMI Receiver Self-Guided Demonstration - Demo Guide
Other Features
APD
Amplitude probability distribution (APD) measures the probability of an emission
exceeding a specified level. It is being considered by CISPR as an alternative option for
the EMI average detector for measuring microwave ovens.
There are two types of APD limits allowed by CISPR. The first specifies an emission
value for a given probability. The second specifies a probability for a given emissions
amplitude. The MXE supports both of these types of limits.
In this demonstration, we will use the APD measurement to measure the probability of
a pulse exceeding a specified level. We will start by configuring the signal generator to
output a pulse train, set APD measure time and Res BW, create and turn on a limit line,
and use APD to measure the pulse.
APD Demo Instructions for MXG Keystrokes
Preset signal generator MXG [Preset]
Set frequency 1 GHz and amplitude 50 dBuV [FREQ], [1], {GHz}
[AMPLD], [5], [0], {dBuV}
Set pulse period 1 s, pulse width 1 ms
Set pulse on
[PULSE], {Pulse Period}, [1], {s}
[PULSE], {Pulse Width}, [1], {ms}
[PULSE], {Pulse On}
Set RF on and modulation on [RF on/off]
[Mod on/off]
The green lights on indicates RF and modulation on
APD Demo Instructions for MXE Keystrokes
Make sure you are in EMI receiver mode [Mode], {EMI Receiver}
Switch to APD measurement [Meas], {APD}
Set frequency [FREQ], {Frequency}, [1], {GHz}
Set measurement time [Meas Setup], {Meas Time}, [1], [.], [2], {s}
Set RBW [BW], {Res BW}, [1], {MHz}
Select APD method to {Disturbance Level}
and define a limit line
[Meas Setup], {More 1 of 2}, {Limits}, {Edit}, {APD Method}, {Disturbance Level}, {Probability of Time},
{10
-4
}
[Meas Setup], {More 1 of 2}, {Limits}, {Edit}, {Frequency}, [1], {GHz}, {Dist Level (E limit)}, [5], [0], {dBuV}
Turn limit line on [Meas Setup], {More 1 of 2}, {Limits}, {Limit On}
APD Demo Instructions for MXG Keystrokes
Toggle modulation on and off
See Figure 23
Toggle [Mod on/off], and [Mod on/off]
Watch the APD measurement as you slowly toggle the pulse modulation on and off—you should see the
trace pass with Mod on and the trace fail with Mod off
Did you know?
Traditional limit lines are a function
of frequency and amplitude. APD
limits differ from traditional limit
lines because APD is dependent
on frequency, amplitude, and
probability.

Keysight N9038A Specifications

General

Brand	Keysight
Model	N9038A
Category	Measuring Instruments
Language	English