HP EPM-442A Bedienungsanleitung Seite 66
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Power Meter Operation
Setting Averaging
2-28 HP EPM-442A User’s Guide
Setting Averaging
The power meter uses a digital filter to average power readings. The
number of readings averaged can range from 1 to 1024 in binary
progression. This filter is used to reduce noise, obtain the desired
resolution and to reduce the jitter in the measurement results. Increasing
the value of the filter length reduces measurement noise. However, the
time to take the measurement is increased. You can select the filter length
or you can set the power meter to auto filter mode. The default is “AUTO”.
When the auto filter mode is enabled, the power meter automatically sets
the number of readings averaged together to satisfy the filtering
requirements for most power measurements. The number of readings
averaged together depends on the resolution and the power level currently
being measured. Figure 2-5 lists the number of readings averaged for each
range and resolution when the power meter is in auto filter mode and is
set to normal speed mode (refer to the HP EPM-441A/442A Programming
Guide for details of the readings averaged in the other speed modes).
Resolution is a window function and not a channel function. In the case
where a channel is set up in both the upper and lower window and the
resolution settings are different, the highest resolution setting is taken to
calculate the averaging number. For example, if the upper window has a
resolution setting of 2 and is measuring channel A - channel B and the
lower window has a resolution of 4 and is measuring channel A. In this
instance channel A averaging is calculated with a resolution of 4 and
channel B with a resolution of 2.
- User’s Guide 1
- Legal Information 3
- Limitation of Warranty 4
- Exclusive Remedies 4
- Equipment Operation 5
- General Safety Considerations 6
- IEC 1010-1 Compliance 7
- Regulatory Information 8
- Declaration of Conformity 9
- DECLARATION OF CONFORMITY 9
- List of Related Publications 10
- HP EPM-442A Options 11
- About this Guide 12
- Table of Contents 13
- List of Figures 17
- List of Tables 19
- Getting Started 21
- Turning On the Power Meter 23
- The Front Panel at a Glance 24
- The Display Layout 27
- Selecting Your Display Layout 29
- Display Tutorial 30
- Window Symbols 32
- 1 of N Entry Window 33
- Numeric or Alphanumeric Entry 33
- The Rear Panel at a Glance 34
- HP EPM-442A User’s Guide 1-15 35
- 8. Serial Label 35
- Adjusting the Carrying Handle 36
- Rack Mounting the Power Meter 37
- Zeroing the Power Meter 41
- Calibrating the Power Meter 42
- HP EPM-442A User’s Guide 2-7 45
- Procedure 46
- Power Sensors 48
- Making the Measurement 52
- 2-16 HP EPM-442A User’s Guide 54
- HP EPM-442A User’s Guide 2-19 57
- 2-20 HP EPM-442A User’s Guide 58
- HP EPM-442A User’s Guide 2-21 59
- Making Relative Measurements 62
- Setting the Resolution 63
- Setting Offsets 64
- Setting Averaging 66
- Measuring Pulsed Signals 68
- Setting Measurement Limits 70
- Checking for Limit Failures 71
- Channel Measurements 73
- Making Ratio Measurements 75
- Setting the Range 79
- HP-IB Address 80
- Recorder Output 81
- Leveling a Source Output 82
- 2-46 HP EPM-442A User’s Guide 84
- Channel A 85
- Channel B 85
- Presetting the Power Meter 86
- Self Test 88
- HP-IB Testing 91
- Test Descriptions 92
- Operator Maintenance 94
- Check the Basics 96
- Instrument serial numbers 96
- UK12345678 97
- Sales and Service Offices 98
- Power Meter Operation 100
- Contacting Hewlett-Packard 100
- 2-64 HP EPM-442A User’s Guide 102
- Menu Reference 103
- Introduction 104
- The Front Panel Menu Maps 105
- Frequency/Cal Fac Menu 106
- Meas Setup Menu 107
- Rel/Offset Menu 108
- Save/Recall Menu 108
- System Inputs Menu 109
- System Inputs Menu Continued 110
- Zero/Cal Menu 111
- Front Panel Menu Reference 112
- Frequency 113
- More More 117
- Diagrammatical Hardkeys 129
- Error Messages 131
- 4-12 HP EPM-442A User’s Guide 142
- Specifications 143
- Power Meter Specifications 145
- Accuracy 146
- Power Reference 147
- Measurement Speed 148
- Zero Drift of Sensors 149
- Measurement Noise 149
- Settling Time 151
- Power Sensor Specifications 154
- General Characteristics 155
- Environmental Characteristics 156
- 5-16 HP EPM-442A User’s Guide 158
- 3-16, 3-20 161
- "Zero/Cal" 164
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