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Fluke PM6690 Operator's Manual

Timer / counter / analyzer
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  • Page 1 Timer/Counter/ Analyzer PM6690 Operators Manual...
  • Page 2 PN 4822 872 20301 April 2005 - First Edition © 2005 Pendulum Instruments AB. All rights reserved. Printed in Sweden.

  • Page 3: Table Of Contents

    Table of Contents 2 Using the Controls GENERAL INFORMATION ... . . VI About this Manual ....VI Basic Controls .
  • Page 4 Inaccuracies ....4-18 4 Measuring Functions Voltage ..... . 4-22 Introduction to This Chapter .
  • Page 5 Inputs A and B ....8-5 Input C (PM6690/6xx) ... . . 8-6 Input C (PM6690/7xx) .

  • Page 6: General Information

    GENERAL INFORMATION About this Manual This manual contains directions for use that apply to the Timer/Counter/Analyzer PM6690. In order to simplify the references, the PM6690 is further referred to throughout this manual as the '90'. Warranty The Warranty Statement is part of the Getting Started Manual that is included with the shipment.

  • Page 7: Preparation For Use

    Chapter 1 Preparation for Use...

  • Page 8: Preface

    Preparation for Use Preface Introduction Powerful and Versatile Functions Congratulations on your choice of instrument. A unique performance feature in your new in- It will serve you well for many years to come. strument is the comprehensive arming possi- Your Timer/Counter/Analyzer is designed to bilities, which allow you to characterize virtu- bring you a new dimension to bench-top and ally any type of complex signal concerning...

  • Page 9: No Mistakes

    Preparation for Use as Standard and Allan Deviation on sample Design Innovations sizes up to 2 * 10 State of the Art Technology No Mistakes Gives Durable Use You will soon find that your instrument is more or less self-explanatory with an intuitive These counters are designed for quality and user interface.

  • Page 10: Remote Control

    Preparation for Use Fast GPIB Bus measured by means of Analog/Digital Converters. These counters are not only extremely power- The counter’s microprocessor calculates the ful and versatile bench-top instruments, they result after completing all measurements, i.e. also feature extraordinary bus properties. the digital time measurement and the analog The bus transfer rate is up to 2000 triggered interpolation measurements.

  • Page 11: Safety

    Preparation for Use Safety Introduction Safety Precautions Even though we know that you are eager to All equipment that can be connected to line get going, we urge you to take a few minutes power is a potential danger to life. Handling to read through this part of the introductory restrictions imposed on such equipment chapter carefully before plugging the line con-...

  • Page 12: Caution And Warning Statements

    Do not overlook the safety in- structions! Shows where the protective ground – Inform your Fluke representative. terminal is connected inside the instrument. For example, the instrument is likely to be un- Never remove or loosen this screw. safe if it is visibly damaged.

  • Page 13: Unpacking

    Also no- page 2-5. Installed options are listed under the tify your local Fluke sales or service organiza- menu User Options - About, where you can tion in case repair or replacement may be re- also find information on firmware version and quired.

  • Page 14: Grounding

    Preparation for Use Orientation and Cooling CAUTION: If this fuse is blown, it is The counter can be operated in any position likely that the power supply is badly damaged. Do not replace the desired. Make sure that the air flow through fuse.

  • Page 15: Rackmount Adapter

    Preparation for Use Rackmount Adapter WARNING: Do not perform any inter- nal service or adjustment of this instrument unless you are qualified to do so. Before you remove the cover, dis- connect mains cord and wait for one minute. Capacitors inside the instrument Fig.
  • Page 16 Preparation for Use – Remove the four feet from the cover. Use a screwdriver as shown in the following illustration or a pair of pliers to remove the springs holding each foot, then push out the feet. Fig. 1-6 Removing feet from the cover. –...

  • Page 17: Using The Controls

    Chapter 2 Using the Controls...

  • Page 18: Basic Controls

    Using the Controls Basic Controls A more elaborate description of the front and survey, the purpose of which is to make you rear panels including the user interface with familiar with the layout of the instrument. its menu system follows after this introductory INPUT A INPUT B SETTINGS...
  • Page 19 Using the Controls STAT/PLOT VALUE MEAS FUNC AUTO SET CURSOR CONTROL Menu tree for Adjusts input Enters one of Enters the nor- selecting mea- trigger voltages three statistics mal numerical surement func- automatically to The cursor presentation presentation tion. the optimum lev- position, marked modes.

  • Page 20: Secondary Controls

    Using the Controls Secondary Controls Connectors & Indicators GRAPHIC DISPLAY SOFTKEYS 320 x 97 pixels LCD with backlight for show- The function of these seven keys is menu de- ing measurement results in numerical as well pendent. Actual function is indicated on the as graphical format.

  • Page 21: Rear Panel

    Using the Controls Rear Panel Type Plate Protective Ground Indicates instrument Terminal type and serial This is where the pro- number. tective ground wire is connected inside the in- strument. Never tamper with this screw! Optional Main Input Connectors A temp. sensor controls the The front panel inputs can speed of the fan.

  • Page 22: Description Of Keys

    Using the Controls nel, you will most probably get a measure- Description of Keys ment result. The AUTOSET system ensures that the trigger levels are set optimally for Power each combination of measurement function and input signal amplitude, provided rela- The ON/OFF key is a toggling secondary tively normal signal waveforms are applied.

  • Page 23: Display Contrast

    Using the Controls Display Contrast full resolution together with a number of aux- iliary parameters in small characters with lim- When no cursor is visible (no active menu se- ited resolution. lected), the UP/DOWN arrows are used for adjusting the LCD display contrast ratio. Enter The key marked ENTER enables you to con- firm a choice without leaving your menu posi-...

  • Page 24: Entering Numeric Values

    Using the Controls Numerical Trend Plot Fig. 2-4 Statistics presented numerically. Fig. 2-6 Running trend plot. In this mode the statistical information is dis- This mode is used for observing periodic fluc- played as numerical data containing the fol- tuations or possible trends. Each plot termi- lowing elements: nates (if HOLD is activated) or restarts (if RUN is activated) after the set number of...

  • Page 25: Hard Menu Keys

    Using the Controls • Whenever it is possible to enter numeric val- Impedance: 50 W or 1 MW ues, the keys marked with 0-9; . (decimal • Attenuation: 1x or 10x ± point) and (stands for Change Sign) take on •...
  • Page 26 Using the Controls Settings Fig. 2-9 The main settings menu. Fig. 2-12 Setting arming conditions. This key accesses a host of menus that affect Arming is the general term used for the means the measurement. The figure above is valid af- to control the actual start/stop of a measure- ter changing the default measuring time to ment.
  • Page 27 Using the Controls timestamping which measurement In this menu you can do the following: channel precedes the other. • Set the number of samples used for cal- • Auto Trig Low Freq culation of various statistical measures. In a value input menu you can set the •...
  • Page 28 Using the Controls The Limits branch is used for setting numeri- marked X is used for entering the display cal limits and selecting the way the instrument reading as the value of the constant. will report the measurement results in relation The Limit submenu is treated in a similar to them.
  • Page 29 Using the Controls • The following can be done: Setup protection Toggle the softkey to switch between • Save current setup ON/OFF modes. When is ac- tive, the memory positions 1-10 are all protected against accidental overwriting. Fig. 2-24 Selecting memory position for saving a measurement setup.
  • Page 30 Using the Controls GPIB Mode • calibration date • There are two command systems to choose firmware versions for: from. « basic instrument • « Native interfaces The SCPI command set used in this mode • optional factory-installed hardware fully exploits all the features of this instru- ment series.

  • Page 31: Default Settings

    Using the Controls Default Settings See page 2-13 to see how the following prepro- grammed settings are recalled by a few key- strokes. PARAMETER VALUE/SETTING PARAMETER VALUE/SETTING Input A & B Pacing State Pacing Time 20 ms Trigger Level AUTO Trigger Slope POS (A), NEG (B) Mathematics...
  • Page 32 Using the Controls This page is intentionally left blank. 2-16 Default Settings...

  • Page 33: Input Signal Conditioning

    Chapter 3 Input Signal Conditioning...

  • Page 34: Input Amplifier

    Input Signal Conditioning Input Amplifier The input amplifiers are used for adapting the widely varying signals in the ambient world to Fig. 3-2 Input settings menu. the measuring logic of the timer/counter. These amplifiers have many controls, and it is essential to understand how these controls CAUTION: Switching the impedance to 50 W when the input voltage is...

  • Page 35: Coupling

    Input Signal Conditioning Coupling NOTE: For explanation of the hysteresis band, see page 4-3. Switch between AC coupling and DC cou- pling by toggling the softkey AC/DC. DC Coupling AC Coupling Fig. 3-5 No triggering due to AC coupling of signal with low duty cycle. Fig.

  • Page 36: Man/Auto

    Input Signal Conditioning higher frequencies than the fundamental sig- 3rd or 4th cycle. A cutoff frequency that is too nal. high (>2 times the input frequency) also leads to a stable reading. Here one noise pulse is Digital Lowpass Filter counted for each half-cycle.

  • Page 37: Trig

    Input Signal Conditioning Speed deleting the position preceding the current cursor position. The Auto-function measures amplitude and calculates trigger level rapidly, but if you aim at higher measurement speed without having to sacrifice the benefits of automatic trigger- ing, then use the Auto Trig Low Freq func- tion to set the lower frequency limit for volt- age measurement.

  • Page 38: How To Reduce Or Ignore Noise And Interference

    Input Signal Conditioning To ensure reliable measuring results, the coun- How to Reduce or ter has the following functions to reduce or eliminate the effect of noise: Ignore Noise and – 10x input attenuator Interference – Continuously variable trigger level –...

  • Page 39: How To Use Trigger Level Setting

    Input Signal Conditioning trigger or hysteresis window more than once do not attenuate the signal too much, and set per input cycle and give erroneous counts. the sensitivity of the counter high. In practice however, trigger errors caused by erroneous counts (Fig. 3-10 and Fig. 3-12) are much more important and require just the op- posite measures to be taken.

  • Page 40: Harmonic Distortion

    Input Signal Conditioning tem makes many measurements per high sensitivity (narrow hysteresis band) to re- second. Here you can increase the duce the trigger uncertainty. Triggering at or measuring rate by switching off this close to the middle of the signal leads to the probing if the signal amplitude is con- smallest trigger (timing) error since the signal stant.

  • Page 41: Measuring Functions

    Chapter 4 Measuring Functions...

  • Page 42: Introduction To This Chapter

    Measuring Functions Introduction to This Chapter Selecting Function This chapter describes the different measuring functions of the counter. They have been See also the front panel layout on page 2-3 to grouped as follows: find the keys mentioned in this section to- Frequency measurements gether with short descriptions.

  • Page 43: Frequency Measurements

    Measuring Functions Frequency Measurements FREQ A, B – Auto Trig. Note that this setting will be made once only if Man Trig has been se- The counter measures frequency between lected earlier. 0 Hz and 300 MHz on Input A and Input B. Pressing AUTOSET twice within two sec- onds also adds the following setting: Frequencies above 100 Hz are best measured...

  • Page 44: Ratio A/B, B/A, C/A, C/B

    Measuring Functions cycles will be 3 x prescaling factor. The RATIO A/B, B/A, 3 GHz option, for example, has a prescaling factor of 16 and requires at least 48 cycles in C/A, C/B each burst. To find the ratio between two input frequen- The minimum burst duration is 40 ns below cies, the counter counts the cycles on two and 80 ns above 160 MHz.

  • Page 45: Burst Measurements Using Manual

    Measuring Functions Burst Measurements using Selecting Measurement Time Manual Presetting You can measure the frequency on Input A and Input B to 300 MHz and on Input C with limited specifications to the upper frequency limit of the prescaler with the internally syn- chronized BURST function as follows: –...

  • Page 46: Frequency Modulated Signals

    Measuring Functions not start erroneously during the Burst Off du- Frequency ration or inside the burst. Modulated Signals M e a s u r e A frequency modulated signal is a carrier wave signal (CW frequency = f ) that changes in frequency to values higher and lower than the frequency f .

  • Page 47: F Max

    Measuring Functions may remain uncompensated for, and lead to a counter calculate the mean value of the sam- ples. measuring result that is too high or too low. W o r s t C a s e M e a s u r i n g T i m e You will usually get good results with 0.1 s measurement time per sample and more than D u r a t i o n , w h e r e...

  • Page 48: P-P

    Measuring Functions are much like the burst measurements de- scribed earlier in this manual. Press SETTINGS ® STAT and set No.of – samples to 1000 or more. Carrier Wave Frequency – Press Meas Time and select a low value. The carrier wave (CW) is only continuously Press STAT/PLOT and watch Df present in a narrow amplitude band in the = ´...

  • Page 49: Modulating Frequency

    Measuring Functions Modulating Frequency Theory of The easiest way to measure the modulating Measurement frequency is after demodulation, for instance by means of a so-called RF-detector probe (also known as a demodulator probe, e.g. Reciprocal Counting Pomona type 5815) used with AC-coupling of Simple frequency counters count the number the input channel.

  • Page 50: Sample-Hold

    Measuring Functions tual gate time (tg) and the number of cycles When no triggering has occurred during the (n) that occurred during this gate time. time-out, the counter will show NO SIGNAL. Thereafter, the counter calculates the fre- Measuring Speed quency according to Mr.
  • Page 51 Measuring Functions Prescaling May Influence Function Prescaling Measurement Time Factor Prescalers do affect the minimum measure- FREQ A/B (300 MHz) ment time, inasmuch as short bursts have to BURST A/B (<160 MHz) contain a minimum number of carrier wave BURST A/B (>160 MHz periods.

  • Page 52: Period

    Measuring Functions RF Signals PERIOD As mentioned before, a prescaler in the C-in- put divides the input frequency before it is Single A, B counted by the normal digital counting logic. The division factor is called prescaler factor Average A, B, C and can have different values depending on the prescaler type.

  • Page 53: Time Measurements

    Measuring Functions Time Measurements Introduction Triggering The set trigger level and trigger slope define Measuring the time between a start and a stop the start and stop triggering. condition on two separate channels is the basis for all time interval measurements. In addition If Auto is on, the counter sets the trigger level to the fundamental function Time Interval A to 50% of the signal amplitude, which is ideal...

  • Page 54: Time Interval

    Measuring Functions tion that virtually moves the trigger points by Rise and fall time can be measured on both in- put A and input B. half the hysteresis band. By convention, rise/fall time measurements are made with the trigger levels set to 10 % (start) and 90 % (stop) of the maximum pulse Time Interval amplitude, see Figure 4-15.

  • Page 55: Pulse Width A/B

    Measuring Functions Pulse width ually adjust the relative trigger levels (in %) Duty factor when Auto Trigger is active. Both input Period channel menus are used for entering the lev- els, but only one channel is the active signal The total measurement time will input.

  • Page 56: Overdrive And Pulse Rounding

    Measuring Functions Overdrive and Pulse Auto Trigger Rounding Auto Trigger is a great help especially when you measure on unknown signals. However, Additional timing errors may be caused by overshoot and ringing may cause Auto to triggering with insufficient overdrive, see Fig- choose slightly wrong MIN and MAX signal ure 4-17.

  • Page 57: Phase

    Measuring Functions Phase What is Phase? A somewhat more elaborate method is used in these counters. It allows the necessary mea- Phase is the time difference between two sig- surements to be performed in one pass by us- nals of the same frequency, expressed as an ing time-stamping.

  • Page 58: Possible Errors

    Measuring Functions Random Errors Possible Errors The phase quantization error algorithm is: Phase can be measured on input signal fre- ´ ´ ° ps FREQ quencies up to 160 MHz. However, at these very high frequencies the phase resolution is For example, the quantization error for a reduced to: 1 MHz input signal is thus:...
  • Page 59 Measuring Functions Random error = Trigger level timing error quant err start trg err stop trg err 160 MHz 28.8° The total random errors are thus: 100 MHz 18.0° » ° (single-shot) 0 04 0 85 10 MHz 1.8° What about random errors caused by internal 1 MHz 0.18°...
  • Page 60 Measuring Functions The nominal trigger point is 0 V with an un- measurements. Depending on the acceptable certainty of ± 10 mV. residual error, you can use one of the methods described below. The first one is very simple A sine wave expressed as but does not take the inter-channel propaga- ´...
  • Page 61 Measuring Functions In order to minimize the errors you should also maintain the signal amplitudes at the in- puts, so that the deviation between calibration and measurement is kept as small as possible. The same restrictions as for Method 1 regard- ing frequency and amplitude apply to this method, i.e.

  • Page 62: Voltage

    Measuring Functions Voltage Press MEAS FUNC ® Volt. The counter can measure the input voltage levels V + V p e a k and V on DC-input voltages and on repeti- tive signals between 1 Hz and 300 MHz. The default low frequency limit is 20 Hz but can be changed via the SETTINGS ®...

  • Page 63: Rms

    Measuring Functions When the waveform (e.g. sinusoidal, triangu- lar, square) of the input signal is known, its crest factor, defined as the quotient(Q ) of the peak (V ) and RMS (V ) values, can be used to set the constant K in the mathematical function K * X+L.
  • Page 64 Measuring Functions This page is intentionally left blank. 4-24 V...

  • Page 65: Measurement Control

    Chapter 5 Measurement Control...

  • Page 66: About This Chapter

    Measurement Control shows the results from a single input cycle. About This Chapter The exceptions are Frequency and Period Average. This chapter explains how you can control the Single or Average is not relevant for V start and stop of measurements and what you can obtain by doing so.

  • Page 67: Start Arming

    Measurement Control Arming is somewhat complicated yet gives the flexibility to perform a measurement on a specific portion of a complex signal, like a frequency measurement on the colorburst con- tained in a composite video signal. Other examples of arming can be found later in this chapter, starting on page 5-9.

  • Page 68: Controlling Measurement Timing

    Measurement Control Controlling Measurement Timing The Measurement – The set measurement time has expired (ap- plies to Frequency and Period Aver- Process age measurements only). – The input signal fulfils the stop trigger Basic Free-running Measurements conditions, normally when it passes the Since these counters use the reciprocal count- trigger window the second time.

  • Page 69: Measurement Time And Rates

    Measurement Control 99999999, and the quantization error is worst A block is a collection of consecutive mea- case. The best case is when the displayed surements, the results of which are stored in value is 10000000. Then the quantization res- local memory for statistics or plotting pur- olution corresponds to ±...
  • Page 70 Measurement Control as opposed to the more common “start arm- – A selected part of a complex waveform ing”. signal. Signal sources that generate complex wave When you use arming, you disable the normal forms like pulsed RF, pulse bursts, TV line free-run mode, i.e.
  • Page 71 Measurement Control triggering during the external period. See Fig. – Press INPUT A and adjust the settings to 5-3. suit the interesting part of the signal. – Press INPUT B and adjust the settings so S t o p A r m that the unique trigger point can be de- S t a r t A r m tected.
  • Page 72 Measurement Control DISPLAY PRESS HO LD? RESTART START W AITFO R DELAY? ARMING ? EXT. SIGNAL W AITFORINPUT W AITPR ESETTIME SIG NALTOTRIGG ER STARTO F MEASUREMENT TRIG G ER W AITPR ESETTIME HO LD-O FF? STOP W AITFOR ARMING ? EXT.

  • Page 73: Arming Setup Time

    Measurement Control Arming Setup Time Arming Examples The arming logic needs a setup time of Introduction to Arming about 5 nanoseconds before the counter is Examples really armed; see Fig. 5-6. The following arming examples are available: A r m i n g S i g n a l #1 Measuring the first pulse in a burst M e a s u r e d S i g n a l #2 Measuring the second pulse in a burst...
  • Page 74 Measurement Control scribed first does not employ arming at all but B. Synchronization Using Start rather draws on the fact that a counter of this Arming type tends to self-synchronize its internal pro- The SYNC signal can be directly used to arm cesses to the input signal.

  • Page 75: Measuring The Second Burst Pulse

    Measurement Control Set the time delay to a time longer than the If the SYNC-pulse timing is not so suitable as duration of a pulse burst and shorter than the in the above measurement example, then arm- repetition time of the pulse bursts. S y n c E See Fig.

  • Page 76: Measuring The Time Between Burst Pulse #1 And #4

    Measurement Control #3 Measuring the Time riod starts synchronously with the start trigger event. The Hold Off time should be set to ex- Between Burst Pulse #1 and pire somewhere between pulse number 3 and 4, see Fig. 5-14. In the previous examples, the synchronization S t a r t A r m task has been to identify the start of a mea- surement and to perform a single-shot time in-...

  • Page 77: Profiling

    Measurement Control a duration that expires in the gap between You must distinguish between two different pulse #3 and #4. types of measurements called free-running and repetitive sampling. S y n c E Free-Running Measurements S t o p A r m i n g S t a r t A r m i n g Free-running measurements are performed I n p u t A...
  • Page 78 Measurement Control nal calibration ON) plus set measurement When all 100 measurements have been made, the results can be used to plot frequency ver- time. For example, with a measurement time of 0.1 ms, the time between each sample is ap- sus time.

  • Page 79: Process

    Chapter 6 Process...

  • Page 80: Introduction

    Process The default values of K, L and M are chosen Introduction so that the measurement result is not affected directly after activating Math. Recalling the Three different ways to process a measuring default setting will restore these values as result are available: Averaging, Mathematics well.

  • Page 81: Statistics

    Process Allan Deviation vs. Standard Statistics Deviation Statistics can be applied to all measuring func- The Allan Deviation is a statistic used for tions and can also be applied to the result from characterizing short-term instability (e.g. Mathematics. caused by jitter and flutter) by means of sam- ples (measurements) taken at short intervals.

  • Page 82: Measuring Speed

    Process trigger levels, and 1000 or 10000 times a – Press Pacing time and enter a new value fraction of a second is a long time. if you want to change the default value 20 ms. The range is 2 ms - 1000 s. The –...

  • Page 83: Statistics And Mathematics

    Process k = 3 for a confidence level of 99.7% you should use a limited number of samples (3s - limits) so that the slow variation does not become no- ticeable or alternatively use the dedicated sta- Example tistic measure for this kind of measurement, the Allan deviation.

  • Page 84: Limits

    Process • Even higher versatility can be exploited with a Capture controller and the optional TimeView™ Fre- The measurements are compared with Lower Limit quency and Time Analyzing Software Pack- the limits set under Upper Limit , and the symbol will age.

  • Page 85: Limit Mode

    Process Limit Mode This type of graphic resembles a classic ana- log pointer instrument, where the pointer is a The Limit Mode offers three choices: "happy smiley" as long as it is positioned • inside the limits and a "sad smiley" when it Above gets outside the limits but is still within the Results above the set lower limit will...
  • Page 86 Process This page is intentionally left blank. 6-8 Limits and Graphics...

  • Page 87: Performance Check

    Chapter 7 Performance Check...

  • Page 88: General Information

    Reference Oscillator –9 10 MHz, 1 * 10 (e.g. 909) for calibrating PM6690/_5_ & PM6690/_6_ DC -50 V to +50 V (e.g. 5500) for calibrating the built-in voltage ref- Voltage Calibrator erence, alternatively corresponding DC power supply + DVM with uncertainty <0.1 %...

  • Page 89: Front Panel Controls

    Performance Check that something changes on the display when Front Panel you press a key. Consequently you can press the keys in almost any order without paying Controls attention to the exact response, but for those who want to be more systematic there is a ta- Internal Self-Tests ble overleaf, where all keys are exercised at least once.
  • Page 90 Performance Check Key(s) Display Notes STANDBY Red standby LED On (Key common to ON) Red standby LED Off (Key common to Backlight On STANDBY) Menu for setting Slope, Coupling, Impedance INPUT A Input A: etc. Menu for entering numeric values in V or mV Trig Trig: xy mV 0.123V...

  • Page 91: Short Form Specification Test

    Performance Check Key(s) Display Notes Period Cursor position marked by text inversion ENTER Single A Period Single A: at upper left corner EXIT/OK Menu disappears STAT/PLOT Period Single A Aux parameters: Max, Min, P-P, Adev, Std MEAN: VALUE Stat parameters dis- appear Table 7-2 Keyboard test...

  • Page 92: Voltage

    Performance Check Voltage – – Press EXIT/OK. Recall the DEFAULT settings. Press MEAS FUNC ® Freq ® Freq A – – Press INPUT A and select DC coupling. ®B. Do not apply an input signal to Input A yet. – The counter should now indicate: = 0 ±...

  • Page 93: Trigger Indicators And Input Controls

    Performance Check Trigger Indicators and Input Controls Trigger Level Trigger Indicator Pass (manually set) Input A Input B +1 V -1 V 0.0 V blinking Table 7-4 Trigger indicator check. NOTE: This test must be performed in the se- verify by pressing EXIT/OK. Check the quence given.

  • Page 94: Trigger Level Check

    Oscillator Frequency Readout Suitable Reference 10.00000000 MHz ± 150 Hz PM6690/_1_ (Standard) 10.00000000 MHz ± 1 Hz PM6690/_5_(OCXO) 10.00000000 MHz ± 0.25 Hz PM6690/_6_(OCXO) Table 7-6 Acceptance test for oscillators.

  • Page 95: Resolution Test

    Performance Check Resolution Test Rear – Connect the pulse generator to a power Inputs/Outputs splitter. – Connect one side of the power splitter to 10 MHz OUT Input A on the counter using a coaxial ca- ble. – Connect an oscilloscope to the 10 MHz –...

  • Page 96: Measuring Functions

    Performance Check – Activate start arming by keying in the fol- Check of HOLD lowing sequence: SETTINGS ® Start Chan ® E OFF Function – The counter does not measure. – Recall the DEFAULT settings. – Apply one single pulse to Ext Arm Input. Select the following common timer/counter –...

  • Page 97: Options

    Performance Check – Connect the output of a signal generator Options covering the specified frequency range to the RF input of the counter. Input C Check – Connect the 10 MHz REF OUT from the generator to the EXT REF IN on the rear To verify the specification of the different RF panel of the counter.
  • Page 98 Performance Check – Choose Meas Ref from the SETTINGS menu and select External. – Choose Freq C from the MEAS FUNC menu. – Generate a sine wave in accordance with the tables. – Verify that the counter is counting cor- rectly.

  • Page 99: Specifications

    Chapter 8 Specifications...

  • Page 100: Introduction

    Period A, B, C Average Input B: 0.001 Hz - 300 MHz Range: Input C: 100 MHz - 3 GHz (PM6690/6__) 200 MHz - 8 GHz Input A, B: 3.3 ns - 1000 s (PM6690/7__) Input C (3 GHz): 370 ps - 10 ns...

  • Page 101: Period A, B Single

    Specifications Period A, B Single Smart Calculation: Smart Time Int. w. 4 time stamps (2 consecutive Trig A plus 2 consecutive Range A, B: See Period A, B Average Trig B) to determine sign Resolution: 100 ps (A before B or A after B) Display: Display: Main Parameter:...

  • Page 102: Phase A Rel. B, B Rel. A

    Specifications Phase A Rel. B, B Rel. A Smart Calculation: One-pass measurement of pulse width + single period. The measurement Range: -180° to +360° is made with 3 time Resolution: 0.001° to 10 kHz stamps (2 consecutive 0.01° to 1 MHz pos.

  • Page 103: Auto Set / Manual Set

    Specifications counted on either X or Y, with a deadtime de- Input and Output pending on sample speed before next event. Specifications Alternatively: Timestamps are taken alter- nately on channels X and Y, starting with X. Inputs A and B Register Data: Timestamp values of trig- ger condition X...

  • Page 104: Input C (Pm6690/6Xx)

    Connector: Type N female Freq. Meas. & Per. Avg.: 70% and 30% of input signal. Minimum hyster- Input C (PM6690/7xx) esis window if arming on A or B is activated. Freq. Range: 200 MHz - 8 GHz Freq. Range: >1 Hz (default 20 Hz)

  • Page 105: Auxiliary Functions

    Specifications Arming Input: Arming of all meas. func. Sample Size: 2 to 2 x 10 DC - 80 MHz Freq. Range: Max. Sample Slew Rate: >2 V/ms Rate: 250 kSa/s measured, Trigger Level: TTL, 1.4 V nom. 2 kSa/s calculated, Trigger Slope: Positive or negative depending on meas.

  • Page 106: Display

    Specifications Display Hold: Freezes meas. result until Modes: Native mode a new measurement is ini- Agilent compatible mode tiated via Restart. Agilent Limit Alarm: Annunciator on display Compatibility: HP 53131/132/181 com- and/or SRQ via GPIB mands are emulated. Limit Values: Lower limit (limit 1) Code and response for- Upper limit (limit 2)

  • Page 107: Measurement Uncertainties

    Specifications Systematic Uncertainties Repetitive Sampling: Up to 100 Msa/s equiv. sample rate (10 ns be- Trigger Level Timing Error (E tween samples) Time Interval, Rise/Fall Time, Pulse Width, Continuous Duty Factor (x1) Single Period: Yes, from LF to 0.5 MHz repetition rate = TLU x (1/Sx + 1/Sy) ±...

  • Page 108: Time Interval, Pulse Width, Rise/Fall Time

    Specifications Phase N = 800 /Measuring Time, however always >=6 and <=1000 = 0.001° to 1°, depending on input displ frequency (see Phase measurement spec.) Total Systematic Uncertainty Ratio f u = ± Time Base Error x Measurement Result ± = Prescaler factor / (f x meas.

  • Page 109: Calibration

    Specifications Calibration General Specifications Mode: Closed case, menu-con- trolled. Environmental Data Calibration Input: A Class: MIL-PRF-28800F, Class 3 Password Protection: ON or OFF Operat. Temp: 0 °C to +50 °C Storage Temp: -40 °C to +71 °C Input Frequen- Humidity: 5-95 % @ 10-30 °C cies used for TB 5-75 % @ 30-40 °C...

  • Page 110: Explanations

    Specifications Timebase Options Product Family '90' Option Standard PM6690/_5_ PM6690/_6_ Timebase Type UCXO OCXO OCXO Uncertainty due to: -Calibration adjustment tolerance @ +23 °C ± 3 °C <1x10 <1x10 <3x10 -Aging <5x10 <3x10 per 24 h <5x10 <1x10 <3x10 per month <5x10...

  • Page 111: Dimensions & Weight

    Depth: <400 mm Weight: Net 4 kg (8.5 lb) Shipping 7 kg (15 lb) Ordering Information Basic Model PM6690: 300 MHz, 100 ps Timer/Counter including standard timebase and GPIB interface Included with In- strument: 12 months product war- ranty, line cord, brochure...
  • Page 112 Specifications This page is intentionally left blank. 8-14 Ordering Information...

  • Page 113: Index

    Chapter 9 Index...
  • Page 114 Index Index ±1 cycle count error ....4-9 Burst Frequency (CW) ....4-5 AC/DC coupling .
  • Page 115 Index See Also Long time instability Drift measurements....5-13 Gate Duty cycle indicator ....5-2 See Duty factor Harmonic distortion.
  • Page 116 Index effect of ....4-11 Processing a measuring result..6-2 Manual Profiling ....5-9, 5-13 arming.
  • Page 117 Index Stop arming ....5-2, 5-6 of measurement ....5-5 step response profiling .
  • Page 118 Index This page is intentionally left blank. X - X...

  • Page 119: Service

    Chapter 10 Service...

  • Page 120: Sales And Service Office

    Sales and Service office For service information, contact your Fluke service center. To locate an autho- rized service center, visit us on the World Wide Web: www.fluke.com, or call Fluke using any of the phone numbers listed below: 888 993 5853 in U.S.A and Canada...

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