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1. How to open the case, please follow the steps.
1.1 Remove the battery lid.
1.2 You will see the two screws and loosen them.
1.3 Near the BNC cable side, there are two protuberant mortises. Use fingers to push back and pull
upward.
Sapphire Instruments Co., Ltd.
Calibration Procedure of SI-9071
Fig. 1
Fig. 2
1
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Summary of Contents for Sapphire Instruments SI-9071
- Page 1 Sapphire Instruments Co., Ltd. Calibration Procedure of SI-9071 1. How to open the case, please follow the steps. 1.1 Remove the battery lid. 1.2 You will see the two screws and loosen them. Fig. 1 1.3 Near the BNC cable side, there are two protuberant mortises. Use fingers to push back and pull upward.
- Page 2 1.4 Use fingers to press the bottom case inward, and pull it backward and upward. Fig.3 1.5 Hold the bottom case and push back (to input lines direction). Fig.4...
- Page 3 1.6 You will see the two metal cases. There is one screw on the PCB. Loosen it, then the whole metal case can be taken out. There are two wires still connected with the upper case. Leaves them there. Fig. 5 1.7 The metal case is illustrated as follows: Fig.
- Page 4 CON1 Fig. 7 3. Adjustment Procedure: This procedure is for use by qualified service personnel to adjust SI-9071 properly. The equipment’s required are listed in Table 1. Item Minimum Requirements 6VDC/500mA or 9VDC/300 mA Power Supply mains adaptor or 4xAA cells DC Accuracy <...
- Page 5 3.1 Offset Adjustment: a. Referring to Fig. 8, connect both input lines together. b. Connect output BNC connector to a DMM. c. Put SW1 at attenuation 1/10. d. Adjust VR2 to make output voltage approach to zero as small as possible. e.
- Page 6 3.2 Square Wave Adjustment: a. Referring to Fig. 9, connect output BNC to the oscilloscope which has good grounding. b. Set the output of the function generator to 20Vp-p, 10kHz square-wave. c. Connect the red input line to a 20Vp-p, 10 kHz square wave signal lead and the black input line to ground lead.
- Page 7 3.3 Low Frequency CMRR Adjustment a. Referring to Fig. 11, connect output BNC to the oscilloscope which has good grounding. b. Set the output of the Sine wave signal source to 600Vp-p 60 Hz sine-wave c. Put SW1 at attenuation 1/10. d.
- Page 8 3.4 High Frequency CMRR adjustment a. Referring to Fig. 12, connect output BNC to the oscilloscope has good grounding. b. Set the output of the Sine wave signal source to 200Vp-p 20kHz sine-wave c. Put SW1 at attenuation 1/10. d. Set VOLTS/DIV switch on oscilloscope’s panel to 5mV and the TIME/DIV switch to 2ms. f.
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