Bnc 645 User Manual Page 138
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FM:INTernal:FREQuency {<frequency>|MINimum|MAXimum}
Specify the frequency of the modulating waveform. This applies only when the
modulating source is internal. The range is from 2 mHz to 20 kHz and the default
is 10 Hz.
FM:INTernal:FREQuency? [MINimum|MAXimum]
Query the modulating frequency in frequency modulation. The modulating
waveform frequency in hertz will be returned.
FM:DEViation {<peak deviation in hertz>|MINimum|MAXimum}
Specify the peak frequency deviation in hertz. This value represents the peak
variation in frequency of the modulated waveform from the carrier frequency.
The range is from 1µHz to 150 kHz for ramps, from 1µHz to 5.05 MHz for
arbitrary waveforms, from 1µHz to 12.55 MHz for square waveforms and from
1µHz to 25.05 MHz for sine waveforms and the default is 100 Hz. The minimum
value is 1 µHz, but the maximum value is calculated based on the frequency of
the carrier waveform as below:
Maximum deviation = carrier frequency
if the carrier frequency is less than Maximum frequency/2
Maximum deviation = Maximum frequency – carrier frequency
if the carrier frequency is greater than Maximum frequency/2
The frequency deviation must not be greater than the carrier frequency. If a
greater value is set to be the deviation, MODEL 645 waveform generator will
adjust it automatically to the maximum value allowed.
The sum of frequency deviation and the carrier frequency must not be greater
than the maximum frequency of the function used plus 100 kHz (50.1 MHz for
sine and 25.1 MHz for square, 300 kHz for ramp, and 10.1 MHz for arbitrary
waveforms). If a greater frequency deviation is specified, the waveform
generator will automatically adjust it to the maximum value allowed.
When an external source is selected, the carrier is modulated with an external
waveform. The frequency deviation is controlled by the ±5v signal on the rear
panel Modulation In connector. For instance, if a deviation of 100kHz is specified,
then a +5V signal level corresponds to a 100kHz increase in frequency. Lower
external signal levels produce less deviation and negative signal levels reduce
- 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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