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Chapter 6, COMPUTER OPERATION
XY[.] X, Y outputs
Equivalent to the compound command X[.];Y[.]
MAG[.] Magnitude
In fixed point mode causes the lock-in amplifier to respond with the magnitude value
in the range 0 to 30000, full-scale being 10000.
In floating point mode causes the lock-in amplifier to respond with the magnitude
value in the range +3.000E0 to +0.001E-9 volts or +3.000E-6 to +0.001E-15 amps.
PHA[.] Signal phase
In fixed point mode causes the lock-in amplifier to respond with the signal phase in
centidegrees, in the range ±18000.
In floating point mode causes the lock-in amplifier to respond with the signal phase in
degrees.
MP[.] Magnitude, phase
Equivalent to the compound command MAG[.];PHA[.]
RT[.] Ratio output
In integer mode the RT command reports a number equivalent to 1000 × X / ADC1
where X is the value that would be returned by the X command and ADC1 is the
value that would be returned by the ADC1 command.
In floating point mode the RT. command reports a number equivalent to X / ADC 1.
LR[.] Log Ratio output
In integer mode, the LR command reports a number equivalent to
1000 log (X / ADC1) where X is the value that would be returned by the X command
and ADC1 is the value that would be returned by the ADC1 command. The response
range is -3000 to +2079.
In floating point mode, the LR. command reports a number equivalent to
log (X / ADC 1). The response range is -3.000 to +2.079.
NHZ.
Causes the lock-in amplifier to respond with the square root of the noise spectral
density measured at the Y output, expressed in volt/√Hz or amp/√Hz referred to the
input. This measurement assumes that the Y output is Gaussian with zero mean.
(Section 3.10). The command is only available in floating point mode.
This command is not available when the reference frequency exceeds 60 kHz.
- Model 7220 1
- FCC Notice 2
- Declaration of Conformity 2
- Table of Contents 3
- TABLE OF CONTENTS 4
- Appendix A, Specifications 6
- Introduction 9
- Chapter 1, INTRODUCTION 10
- Installation & 13
- Initial Checks 13
- 2.2 Initial Checks 15
- Technical Description 17
- 3.2.02 Signal-Channel Inputs 18
- 3.2.04 AC Gain 20
- 3.2.05 Anti-Aliasing Filter 20
- 3.2.07 Reference Channel DSP 22
- 3.2.08 Internal Oscillator 23
- 3.2.09 Demodulator DSP 23
- 3.3 Accuracy 24
- 3.5 Dynamic Reserve 25
- 3.8 Output Channel Filters 27
- 3.10 Noise Measurements 30
- 3.11 Power-up Defaults 30
- 3.12 Auto Functions 30
- 3.12.02 Auto-Sensitivity 31
- 3.12.03 Auto-Phase 31
- 3.12.04 Auto-Offset 31
- 3.12.05 Auto-Measure 32
- 3.12.06 Default Setting 32
- Front and Rear Panels 33
- 4.1.03 REF IN Connector 34
- 4.1.05 MENU Key 36
- 4.1.06 90º Key 37
- 4.1.07 SET Key 37
- 4.2 Rear Panel 38
- 4.2.11 CH1, CH2 Connectors 40
- 4.2.12 TRIG Connector 40
- 4.2.13 ADC1, ADC2 Connectors 40
- 4.2.14 DAC1, DAC2 Connectors 40
- Front Panel Operation 41
- 5.2.01 Input Setup Menu 42
- 5.2.02 Reference Setup Menu 44
- 5.2.03 Output Setup Menu 45
- 5.2.04 Control Options Menu 48
- AUTOMATIC 49
- EXTERNAL 50
- Contrast 50
- 5.2.06 RS232 Setup 1 Menu 51
- 5.2.07 RS232 Setup 2 Menu 52
- 5.2.08 RS232 Setup 3 Menu 53
- 5.2.09 GPIB Setup 1 Menu 54
- 5.2.10 GPIB Setup 2 Menu 55
- 5.2.12 Control Setup Menu 57
- 5.3 Auto Functions Menu 58
- AUTO OFFSET 59
- AUTO MEASURE 59
- Figure 5-18, AC Gain Control 62
- Figure 5-37, Ratio Output 72
- Figure 5-38, Log Ratio Output 72
- ADC1 Volts 73
- ADC2 Volts 73
- Computer Operation 77
- 6.3 RS232 and GPIB Operation 78
- 6.3.03 Choice of Baud Rate 79
- 6.3.08 Handshaking and Echoes 81
- 6.3.09 Terminators 82
- 6.3.10 Command Format 82
- 6.3.11 Delimiters 83
- 6.3.12 Compound Commands 83
- 6.3.14 Service Requests 85
- 6.4 Command Descriptions 86
- 6.4.02 Reference Channel 89
- 6.4.05 Instrument Outputs 92
- 6.4.06 Internal Oscillator 95
- 6.4.07 Auxiliary Outputs 96
- 6.4.08 Auxiliary Inputs 97
- Chapter 6, COMPUTER OPERATION 100
- 6.5 Programming Examples 106
- 6.5.05 Transient Recorder 108
- Storage and Frequency Sweep 109
- Specifications 111
- Reference Channel 112
- Oscillator 113
- Auxiliary Inputs 114
- Data Storage 115
- Interfaces 115
- Power Requirements 115
- Appendix A, SPECIFICATIONS 116
- B.1 RS232 Connector Pinout 117
- Appendix B, PINOUTS 118
- Demonstration 119
- Programs 119
- Cable Diagrams 123
- Appendix D, CABLE DIAGRAMS 124
- Alphabetical Listing of 125
- Commands 125
- 16,000,000 126
- ((25 × n) + 157) 126
- ((25 × n) + 1031) 126
- The value of n 144
- 1 Enables offset facility 144
- Default Settings 147
- Appendix F, DEFAULT SETTINGS 148
- Operating environment 2-1 151
- X[.] command 6-16, E-20 153
- Y[.] command 6-16, E-20 153
- WARRANTY 155
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