Bnc 645 User Manual Page 53
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53
Width Deviation
The width deviation represents the peak variation in the pulse width of
the modulation output based on that of the original pulse carrier
waveform. The default deviation is 10μs, and the range is from 0s to
1000s. In addition, it must not be greater than the pulse width of the
carrier waveform and is also constrained by the following formulas:
WidthDeviation ≤ PulseWidth – Wmin
WidthDeviation≤ Period – (PulseWidth + Wmin)
where Wmin is the minimum pulse width as described in Section 4.5.
When external source is selected as the source of modulating waveform,
the modulation is controlled by the specified width deviation and the ±5v
levels of the external waveform. When the external waveform is at +5v,
the output will reach the maximum pulse width. When the external
waveform is at -5v, the output will reach the minimum pulse width.
How to set up PWM (pulse width modulation)
1. Press the Pulse button to select the pulse carrier waveform and
then set the waveform parameters as described in Section 4.5.
Figure 4-13
2.
Press the Mod button to toggle the PWM output.
3.
Press the softkey under Src to toggle between internal source (Int)
and external source (Ext) for selecting modulating waveform
source.
4.
If internal source is selected:
a.
Press the softkey under Shape to toggle between different
types of modulating waveform. If arbitrary waveform (Arb) is
selected as modulating signal source, the modulating signal
source is depending on the previous waveform selection in
arbitrary function. One may toggle the Mod key to see the
arbitrary modulating waveform message that temporarily
- Model 645 1
- Arbitrary Waveform Generator 1
- Table of Contents 2
- 1 General Information 5
- 1.2 Warranty Information 6
- Limitation of warranty 7
- 1.3 Precaution of Operation 7
- 1.4 Upkeep of Model 645 8
- 1.5 Safety Information 8
- 1.6 Symbols and Terms 9
- 10
- 1.8 Options and Accessories 11
- 2 Overview 12
- 2.3.1 Front Panel 17
- 2.3.2 Rear Panel 18
- 3 Common Operations 19
- To Set Output Amplitude 23
- To Set DC Offset Voltage 25
- 4 Waveform Output Operations 33
- 4.2 Square Wave 34
- 4.3 Ramp Wave 35
- 4.4 Noise Waveform 36
- 4.5 Pulse Waveform 37
- Edge Time 38
- Pulse Duty Cycle 38
- 4.6 Arbitrary Waveform 39
- 4.7 Amplitude Modulation 41
- Modulation Depth 42
- 4.8 Frequency Modulation 44
- 4.9 Phase Modulation 47
- Phase Deviation 48
- Nimum 49
- 4.10 FSK Modulation 50
- 4.11 PWM Waveform 52
- 4.12 Frequency Sweep 54
- 4.13 Burst Operation 59
- Burst Period 61
- Burst Phase 61
- 4.14 Pattern Output 64
- Pattern Generator Cable 69
- 5 System Operations 72
- 5.3 Display Control 77
- 5.4 Beeper 78
- 5.5 Sound 78
- 5.6 Error Display 79
- 5.7 Calibration 79
- 6.1.1 USB Interface 80
- 6.1.2 GPIB Interface 80
- 6.1.3 LAN Interface 81
- Default Gateway 82
- Host Name 82
- Domain Name 82
- DNS Server 82
- The APPLy Commands 85
- IEEE 488.2 Common Commands 93
- ︱1︱2︱3︱4} 93
- 7 Error Messages 94
- 7.1 Command Errors 95
- 7.2 Execution Errors 96
- 7.3 Device Dependent Errors 107
- 7.4 Query Errors 108
- 7.5 Instrument Errors 108
- 7.6 Self-Test Errors 108
- 7.7 Calibration Errors 109
- Appendix 113
- A Specification List 114
- COMMON CHARACTERISTIC 116
- Modulation 117
- Pattern Mode CHARACTERISTIC 119
- Remote Interface Reference 120
- B.2 Output Data Formats 125
- B.3 Command Reference 125
- -- B 128
- BurstCount 130
- -- C 131
- -- D 132
- -- F 137
- -- I to O 147
- -- I 147
- -- L 148
- -- M 148
- -- O 150
- , and high/low 151
- -- P to Z 153
- -- P 153
- -- R 160
- -- S 160
- -- T 163
- -- U 164
- -- V 165
- -- W 169
- ︱1︱2︱3︱4> 170
- C. General Specifications 172
- D. Application Programs 173
- Visual Basic 180
- Visual C++ 180
- Creating the Application 181
- Using the Status Registers 183
- Object Property Setting 184
- THE SRQFetch FUNCTION 185
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