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6-18

Performance Tests

d) Press

[Freq]

Use the knob to set the internal oscillator frequency to the value in the table.

e) Wait for the R reading to stabilize. Record the value of R.

f) Repeat steps 4d and 4e for all of the frequencies listed.

5) This completes the sine output amplitude accuracy and frequency response test. Enter the results of

this test in the test record at the end of this section.

1 2 ... 131 132 133 134 135 136 137 138 139 140 141 ... 177 178

MODEL SR830 1
TABLE OF CONTENTS 3
TABLE OF CONTENTS 4
WARNING 5
Symbol Description 6
SR830 DSP LOCK-IN AMPLIFIER 7
SPECIFICATIONS 7
COMMAND LIST 9
SR830 DSP Lock-In Amplifier 10
GETTING STARTED 13
YOUR FIRST MEASUREMENTS 13
Getting Started 14
THE BASIC LOCK-IN 15
The Basic Lock-in 16
X, Y, R and θ 19
OUTPUTS, OFFSETS and EXPANDS 21
Outputs, Offsets and Expands 22
STORING and RECALLING SETUPS 25
Storing and Recalling Setups 26
AUX OUTPUTS and INPUTS 27
Aux Outputs and Inputs 28
SR830 BASICS 29
WHAT IS A LOCK-IN AMPLIFIER? 29
SR830 Basics 30
WHAT DOES A LOCK-IN MEASURE? 31
THE FUNCTIONAL SR830 33
REFERENCE CHANNEL 35
TIME CONSTANTS and DC GAIN 39
DC OUTPUTS and SCALING 41
DYNAMIC RESERVE 43
INPUT CONNECTIONS 47
EXTERNAL NOISE SOURCES 51
NOISE MEASUREMENTS 53
FRONT PANEL 55
Front Panel 56
STANDARD SETTINGS 58
Signal Input and Filters 59
CH1 Display and Output 66
CH2 Display and Output 69
Reference 72
Interface 78
WARNING MESSAGES 80
REAR PANEL 81
Rear Panel 82
REMOTE PROGRAMMING 85
DETAILED COMMAND LIST 87
REFERENCE and PHASE COMMANDS 88
INPUT and FILTER COMMANDS 89
DISPLAY and OUTPUT COMMANDS 92
AUX INPUT and OUTPUT COMMANDS 93
AUTO FUNCTIONS 95
DATA STORAGE COMMANDS 96
DATA TRANSFER COMMANDS 99
Remote Programming 100
Remote Programming 102
INTERFACE COMMANDS 103
STATUS REPORTING COMMANDS 104
STATUS BYTE DEFINITIONS 105
EXAMPLE PROGRAM 1 109
PERFORMANCE TESTS 119
Performance Tests 120
1. Self Tests 121
2. DC Offset 123
3. Common Mode Rejection 125
Procedure 127
5. Amplitude Linearity 129
6. Frequency Accuracy 131
7. Phase Accuracy 133
9. DC Outputs and Inputs 137
10. Input Noise 139
3. Common Mode Rejection 141
CIRCUIT DESCRIPTION 145
Circuit Description 146
CPU and POWER SUPPLY BOARD 147
DSP LOGIC BOARD 149
ANALOG INPUT BOARD 151
PARTS LIST 153

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