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Data acquisition shows a fairly stable signal | Data acquisition shows a fairly stable signal | ||
Calculate frequency and voltage stability? | Calculate frequency and voltage stability? | ||
Repeating measurements with a square wave - all other settings on function generator unchanged | |||
Changed oscope display to 250us resolution | |||
By eye: Period is about 1.95 ms (line just off the 2ms line). Voltage is 6.1V | |||
By Cursor: 1.980ms, 505.1Hz, 6.28V peak to peak | |||
By Auto Measure: 503.8-504.3 Hz, 1.983 - 1.985ms, 6.28VPeak to Peak | |||
repeat with saw tooth, no instrument changes | |||
By eye: Period is right at 2ms, 500Hz; Amplitude is 5.95V | |||
By Cursor: Period is 2ms, 500Hz; Amplitude is 5.92V | |||
By Auto Measure: Period is Frequency is 501.03-501.08Hz, Amplitude is 5.96V peak to peak | |||
Triggering: | |||
Rising edge means that the trigger occurs as the signal passes the threshold on the way up | |||
Falling edge means it looks for the threshold going down | |||
With a constant signal this will shift the phase by 180 degrees. | |||
Revision as of 14:12, 8 September 2008
Lab 1: Oscilloscope
SUMMARY
Purpose
Is there a purpose? Why would that be?
Data
BK Precision 4017A Function Generator Tektronix TDS 1002 60MHz, 1GS/s Digtal O-Scope
Basic Waveform Data: Measuring sine wave in from the function generator 4017A Settings: 500 Hz, Level? No readout for output level TDS1002: Channel 1 input, DC Coupling, 1V/Division, 1ms/division
Turned function generator output level full down, connected to the oscope Slowly increased output till I found a good sine wave. Played with coupling a bit - AC/DC until a good display was available either way
Measuring by mark 1 eyeball - Able to clearly see 5 cycles taking the expected .5ms each Power level: 6v peak to trough
Measuring with cursors Voltage is 6.04 peak to peak (cursor resolution is .04V). Period is 2ms (freq = 500Hz) (cursor resolution is .04ms). Measurement made across 4 cycles and across 1 cycle (no variation)
Measuring with automatic functions Frequency ranges from 501 to 502Hz, (Period of 1.992 - 2.000ms) Peak to Peak 6.04V to 6.08V
Used the FFT to check signal purity. Primary signal is stable, 2'nd frequency is down 32dB, most noise below 45dB
Data acquisition shows a fairly stable signal Calculate frequency and voltage stability?
Repeating measurements with a square wave - all other settings on function generator unchanged Changed oscope display to 250us resolution
By eye: Period is about 1.95 ms (line just off the 2ms line). Voltage is 6.1V By Cursor: 1.980ms, 505.1Hz, 6.28V peak to peak By Auto Measure: 503.8-504.3 Hz, 1.983 - 1.985ms, 6.28VPeak to Peak
repeat with saw tooth, no instrument changes By eye: Period is right at 2ms, 500Hz; Amplitude is 5.95V By Cursor: Period is 2ms, 500Hz; Amplitude is 5.92V By Auto Measure: Period is Frequency is 501.03-501.08Hz, Amplitude is 5.96V peak to peak
Triggering: Rising edge means that the trigger occurs as the signal passes the threshold on the way up Falling edge means it looks for the threshold going down With a constant signal this will shift the phase by 180 degrees.
Remarks
Ready, willing... able?
Setup
- Entry One
- Indent one title
- Sub One
- Sub Two
- Sub Three
- Indent Two Title
- Sub One
- Sub Two
- Sub three
