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User Manual

CMC251
1.3 GHz Frequency Counter

070-8527-03

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Summary of Contents for CMC251

Page 1: ...User Manual CMC251 1 3 GHz Frequency Counter 070 8527 03...

Page 2: ...nd foreign patents issued and pending Information in this publication supercedes that in all previously published material Specifications and price change privileges reserved Tektronix Inc P O Box 100...

Page 3: ...ny other locations This warranty shall not apply to any defect failure or damage caused by improper use or improper or inadequate maintenance and care Tektronix shall not be obligated to furnish servi...

Page 4: ......

Page 5: ...equencies Between 80 MHz and 1 3 GHz 11 Making Period Measurements 11 Making Pulse Width Measurements 13 Remote Control of Pulse Width Measurements 14 Counting Events 15 Remote Control of TOTAL Mode 1...

Page 6: ...or Channel A 11 Table 5 Gate Time Versus Resolution for Channel B 11 Table 6 Period Measurements 12 Table 7 Resolution For Period Measurements 12 Table 8 Pulse Width Measurements 13 Table 9 Resolution...

Page 7: ...nal that is outside the range specified for that terminal Ground the Product This product is grounded through the grounding conductor of the power cord To avoid electric shock the grounding conductor...

Page 8: ...ge Setting Before applying power ensure that the line selector is in the proper position for the power source being used Provide Proper Ventilation To prevent product overheating provide proper ventil...

Page 9: ...injury hazard not immediately accessible as you read the marking CAUTION indicates a hazard to property including the product Symbols on the Product The following symbols may appear on the product DAN...

Page 10: ...General Safety Summary vi CMC251 User Manual...

Page 11: ...ments up to 0 25 s H Event counting The 10 MHz internal time base using a highly stabilized crystal oscillator provides a single shot resolution of 100 ns Measurement results are displayed using an ei...

Page 12: ...the input line voltage These selectors connect internal wiring for various line voltages This product is intended to operate from a power source that does not supply more than 250 VRMS between the su...

Page 13: ...dix C Replaceable Parts on page 27 for power cord part numbers Front Panel Figure 2 shows the front panel controls connectors and indicators with brief descriptions of the items following the figure 1...

Page 14: ...ing a measurement The LED extinguishes when updating the display 7 Gate Resolution Indicators These LEDs light to indicate the present gate resolution settings X1 X10 X100 or X1000 8 POWER Switch Powe...

Page 15: ...can be made H PERIOD A The Period A mode measures the time it takes for one cycle of the signal applied to CHANNEL A INPUT to be completed H PULSE A The Pulse A mode measures the width of the positive...

Page 16: ...e or possible damage to the CMC251 be sure that the equipment generating the signal is properly grounded before you make any connections to the inputs 17 CHANNEL A INPUT Use this connector to measure...

Page 17: ...al Connections In Total mode the TTL logic levels start TTL high and stop TTL low the display updates This performs the same function as the HOLD button In Pulse mode the TTL logic levels select eithe...

Page 18: ...Getting Started 8 CMC251 User Manual...

Page 19: ...tice is to display the signal on an oscilloscope and obtain the peak voltage level Refer to Table 1 and pick the appropriate input channel Table 1 A or B Channel Input Estimated Frequency Input Voltag...

Page 20: ...ies Below 100 MHz 1 Press the FUNC button until FREQ A is indicated with a lighted LED 2 Refer to Table 3 and set the frequency counter front panel buttons to obtain the best measurement for frequenci...

Page 21: ...Setting Gate Time Resolution PRESCALE Off PRESCALE On X1 0 01 seconds 100 Hz 1 kHz X10 0 1 seconds 10 Hz 100 Hz X100 1 second 1 Hz 10 Hz X1000 10 seconds 0 1 Hz 1 Hz Table 5 Gate Time Versus Resolutio...

Page 22: ...50 mV to 5 V 3 V to 42 V 50 mV to 5 V 3 V to 42 V INPUT VOLTAGE LO button out HI button in LO button out HI button in PRE SCALE Button In Button In Button Out Button Out 3 Press the FUNC button until...

Page 23: ...e rear panel This method is discussed in Remote Control of Pulse Width Measurements on page 14 1 Determine the signal voltage level A good practice is to display the signal on an oscilloscope and obta...

Page 24: ...ormally measures the positive pulse width of the applied signal The negative pulse width can be measured with the use of the external input connector on the rear panel Refer to Figure 4 for a setup di...

Page 25: ...an be controlled remotely with the use of TTL logic levels applied to the external input connector located on the rear panel Refer to Remote Control of TOTAL Mode on page 16 for a description of its u...

Page 26: ...1 Perform Steps 1 through 4 of Counting Events on page 15 2 Connect a signal source that can apply TTL logic levels of low and high 0 V and 5 V to the external input connector CAUTION To avoid damage...

Page 27: ...stop the count same as the HOLD button H Apply a TTL logic high level 5 V to resume the count same as releasing the HOLD button Checking Instrument Operation At any time you can verify the accuracy o...

Page 28: ...Reference 18 CMC251 User Manual...

Page 29: ...rranty Table 10 Warranted Characteristics Characteristic Measurement Channel A Input Bandwidth 1 Hz to 100 MHz AC coupled Sensitivity Sine wave terminated into 1 MW 20 mVRMS 50 mVRMS 1 Hz to 30 MHz 30...

Page 30: ...m Input Voltage 1 Vrms Internal Time Base Crystal Frequency 10 MHz TCXO Setability 0 1 ppm 1 Hz Temperature Stabillity 0 0001 1 ppm from 0_C to 40_C Line Voltage Stability 0 4 ppm with 10 line voltage...

Page 31: ...ror Channel A Resolution Prescale In Prescale Out 1 Hz to 1 kHz 0 1 Hz to 100 Hz Channel B Resolution 10 Hz to 10 kHz Period Mode Range Prescale In Prescale Out 0 04 s to 1 0 s 0 4 s to 1 0 s Frequenc...

Page 32: ...to 99 999 999 counts plus overrange Repetition Rate Sine wave 1 Hz to 10 MHz Power Line Voltage Range Selectable ranges at 50 Hz to 60 Hz 90 VAC to 110 VAC 108 VAC to 132 VAC 198 VAC to 242 VAC 216 VA...

Page 33: ...ischarge Immunity IEC 801 3 RF Electromagnetic Field Immunity IEC 801 4 Electrical Fast Transient Burst Immunity IEC 801 5 Power Line Surge Immunity EC Declaration of Conformity Low Voltage Compliance...

Page 34: ...Appendix A Specifications 24 CMC251 User Manual...

Page 35: ...zene toluene xylene acetone or similar solvents Do not use abrasive cleaners on any portion of the frequency counter Preparing for Shipment If the original packaging is unfit for use or not available...

Page 36: ...lacing the fuse No Display with Power On If the digital display is not lighted but the POWER button is pushed in and the CMC251 Frequency Counter power cord is plugged into an outlet do the following...

Page 37: ...y Tektronix Part Number Fuse 3AG 0 3 A 250 V SB 90 132 V operation 159 0029 00 User Manual 070 8527 XX 115 V Power Cord Refer to Table 15 Optional Accessories The following items are available as opti...

Page 38: ...re available Table 15 Accessory Power Cords Plug Configuration Normal Usage Tektronix Part Number North America 115 V 161 0104 00 Europe 230 V 161 0104 06 United Kingdom 230 V 161 0104 07 Australia 23...

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