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SRS Labs SR510 VCO, INPUT, OUTPUT, AMP CAL, VCO INPUT, VCO RANGE, VCO INPUT, VCO INPUT, REF OUTPUT, FREQUENCY CAL, REFERENCE INPUT, REFERENCE DIGITAL DISPLAY

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OUTPUT can be set to three amplitudes, 1 V, 100 mV, and 10 mV (rms) using the amplitude switch. The output impedance is 600Ω . The AMP CAL screw adjusts the amplitude.

The oscillator frequency is controlled by the VCO INPUT voltage. A voltage from 0V to 10V will adjust the frequency according to the VCO RANGE selected. Three ranges are available, 1 Hz/V, 100 Hz/V, and 10 KHz/V. The input impedance is 10 kΩ . The FREQUENCY CAL screw adjusts the frequency.

There are four ways to set the frequency:

1)Connect X5 or X6 (D/A outputs) to the VCO

INPUT. The frequency is now controllable via the computer interfaces by programming X5 or X6.

2)If the VCO INPUT is left open, then the oscillator will run at the top of its range (i.e. 10 Hz, 1 KHz, or 100 KHz).

3)A 10 KΩ potentiometer may be connected from the VCO INPUT to ground. This pot will then set

the frequency.

4)Connect the VCO INPUT to an external voltage source which can provide 0 to 10V.

In all four cases, if the REF OUTPUT is connected to the REFERENCE INPUT on the front panel, the frequency may be read on the front panel REFERENCE DIGITAL DISPLAY or via the computer interfaces.

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Contents

Page Page TABLE OF CONTENTS Condensed Information SAFETY Guide to Operation Front Panel Calibration and Repair Appendix A: Noise Sources and Cures Appendix B: RS232 Appendix C: GPIB Appendix D: Program Examples LINE VOLTAGE SELECTION LINE FUSE LINE CORD OPERATE WITH COVERS IN PLACE Page General Signal Channel Reference Channel Demodulator Outputs & Interfaces Front Panel Summary Abridged Command List Configuration Switches Signal Inputs Signal Filters Sensitivity Dynamic Reserve Status Diplay Select Output Expand Offset Time Constant Noise Reference and Trigger Level Phase Controls Power Local and Remote Defaults AC Power GPIB Connector RS232 Connector Signal Monitor Output Preamp Connector AMP CAL VCO INPUT VCO RANGE FREQUENCY CAL VCO Communicating with the SR510 Command Syntax Front Panel Status LED's RS232 Echo and No Echo Operation Try-Outwith an ASCII Terminal SR510 Command List A {n} auto offset B {n} bandpass J {n1,n2,n3,n4} end-of-record K n key press L m {,n} output R {n} input trigger S {n} T m {,n} Status Byte Errors Reset Trouble-ShootingInterface Problems Common Hardware Problems include: Common Software Problems include: The SR510 with the RS232 Interface Data Communications Equipment (DCE) The SR510 with the GPIB Interface GPIB Capabilities Serial Polls and Service Requests GPIB with RS232 Echo Mode The SR510 with BOTH Interfaces The Lock-inTechnique A Measurement Example Understanding the Specifications Shielding and Ground Loops Page Page SR510 Block Diagram The Signal Channel Reference Channel Phase Sensitive Detector DC Amplifier and System Gain A Microprocessor Based Design Introduction Signal Amplifier Current Amplifier Bandpass Filter Reference Oscillator Demodulator and Low Pass Amplifier Analog Output and Control Expand Front Panel Microprocessor Control RS232 Interface GPIB Interface Power Supplies Internal Oscillator Multiplier Adjustments Replacing the Front-EndTransistors Non-EssentialNoise Sources Capacitive Coupling Inductive Coupling Page CASE 1 - The Simplest Configuration CASE 2 - RS232 with Control Lines Baud Rate Stop Bits Parity Final Tip Voltage Levels Bus Description Appendix D: Program Examples Program Example 1: IBM PC, Basic, via RS232 Program Example 2: IBM PC, Microsoft Fortran v3.3, via RS232 Page Program Example 3: IBM PC, Microsoft C v3.0, via RS232 Page Program Example 4: IBM PC,Microsoft Basic, via GPIB Page Program Example 5: HP85 via GPIB Documentation Main Assembly PCB Parts List Page Page Page Page Page Page Page Page Page Page Page Page Page Internal Oscillator PCB Parts List Miscellaneous Parts List Front Panel Parts List