Sapphire Instruments SI-9110 Manual Download Page 7

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3.5

High Frequency CMRR adjustment

Referring to Fig. 11, connect output BNC to the oscilloscope has good grounding.

Connect both input lines to a 155 Vp-p, 20 kHz, sine wave signal source.

Put SW1 at 1/100.

Set VOLTS/DIV switch on oscilloscope’s panel to 1mV and the TIME/DIV switch to 0.1ms.

Adjust VC1 slightly to make the amplitude of displayed waveform as small as possible.

Finally the amplitude should be less than 4.9 mVp-p (after excluding noise)..

Fig. 11

3.6

Repeat 3.2 and 3.5 adjustment until both adjustments are O.K.

Summary of Contents for SI-9110

Page 1: ...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 Use fingers to press the bottom case inward and pull it backward and upward 1 4 Fig 2 1 5...

Page 2: ...sistor for adjusting output offset at 100 1 4 VR4 Variable resistor for adjusting output offset at 1000 1 5 VC1 Variable capacitor for adjusting positive square wave compensation 6 VC2 Variable capaci...

Page 3: ...3 Fig 6 3 Adjustment Procedure Please connect a 6VDC power adapter to CON1 and turn SW2 on to warm up for 10 minutes Then follow the steps below...

Page 4: ...connector to a DMM c Put SW1 at 1 100 d Adjust VR2 to make output voltage approach to zero as small as possible e Put SW1 at 1 1000 f Adjust VR4 to make output voltage approach to zero as small as po...

Page 5: ...black input line to ground c Put SW1 at 1 100 d Set the VOLTS DIV switch on oscilloscope s panel to 0 1V for 1 100 and the TIME DIV switch to 20 us e Adjust VC1 to make the displayed waveform become a...

Page 6: ...at 1 100 d Set the VOLTS DIV switch on oscilloscope s panel to 1 mV and the TIME DIV switch to 5ms Then a 60 50 Hz sinusoid waveform should be displayed on the screen e Adjust VR1 to make the amplitud...

Page 7: ...sine wave signal source c Put SW1 at 1 100 d Set VOLTS DIV switch on oscilloscope s panel to 1mV and the TIME DIV switch to 0 1ms e Adjust VC1 slightly to make the amplitude of displayed waveform as...

Page 8: ...ect output BNC to a DMM b Connect the red input line to the positive terminal of a DC voltage source 70VDC and the black input line to the negative terminal source 70VDC c Put SW1 at 1 100 d Adjust VR...