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Testing Performance To test the voltage measurement accuracy (oscilloscope)
Acquire the data
Use the following table for steps 1 through 5. Oscilloscope Settings
V/Div 4 V/Div 1 V/Div 400 mV/Div 40 mV/Div 40 mV/Div 400 mV/Div 1 V/Div 4 V/Div Offset -7.0 V -1.75 V -700.0 mV -70.0 mV 70.0 mV 700.0 mV 1.75 V 7.0 V Supply -14.0 V -3.50 V -1.40 V -140.0 mV 140.0 mV 1.40 V 3.50 V 14.0 V
Voltage Readings
Upper Limit -13.7 V -3.43 V -1.37 V -137.0 mV 143.0 mV 1.43 V 3.57 V 14.3 V Lower Limit -14.3 V -3.57 V -1.43 V -143.0 mV 137.0 mV 1.37 V 3.43 V 13.7 V
1 Set up the oscilloscope according to the table above. a Press the Chan key. b Move the cursor to the V/Div field, then use the RPG knob to dial in the V/Div values shown on the first line of the table. c Move the cursor to the Offset field. Use the front-panel keyboard to enter the offset value shown on the first line of the table. Use the left and right cursor-control keys to select either mV or V. 2 Acquire the zero input voltage. a Disconnect the power supply from the channel input. b Press the blue shift key, then press the Run key. Wait for approximately five seconds (averaging complete), then press Stop. c Press the Markers key. Move the cursor to the Va Volts field. Using the RPG knob, move the Va marker over the oscilloscope trace on the display. 3 Acquire the measured voltage. a Connect the power supply to the channel input. Set the power supply voltage according to the first line of the table above. b Press the blue shift key, then press the Run key. Wait for approximately five seconds (averaging complete), then press Stop. c Press the Markers key. Move the cursor to the Vb Volts field. Using the RPG knob, move the Vb marker over the oscilloscope trace on the display. d Record the voltage in the Va to Vb field in the performance test record. 4 Repeat steps 1 through 3 for the second line of the table, then for the rest of the lines
of the table for channel 1. 5 Repeat from "Set up the logic analyzer" for channel 2, replacing channel 1 with channel 2 where applicable.
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