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Pendulum CNT-66 User Manual

Programmable timer/counter
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CNT-66
Programmable Timer/Counter
Users Manual
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  • Page 1 CNT-66 Programmable Timer/Counter Users Manual...
  • Page 2 4031 600 66001 Rev. 01 (September 2000) This manual, in whole or in part, may not be copied without permission. All product name are trademarks of their respective companies. © 2000 Pendulum Instruments AB All rights reserved. Printed in Sweden.

  • Page 3: Table Of Contents

    Table of Contents EC DECLARATION OF CONFORMITY ..IV Summary of Bus Commands ....5-13 Programming Examples ....5-14 1 Safety Instructions 6 Performance Check Safety .

  • Page 4: Ec Declaration Of Conformity

    EC DECLARATION OF CONFORMITY Number: 4031 100 63700A41 The undersigned, representing the following manufacturer: Manufacturer: Pendulum Instruments AB Sorterargatan 26, Box 541 SE-162 15 Vällingby, Sweden Representative: Jan Herwe Function: Quality Manager herewith declare that the product: Product Identification: Product:...

  • Page 5: Safety Instructions

    Chapter 1 Safety Instructions...

  • Page 6: Safety

    EN 61010-1 and has been supplied in a safe condition. The user of this instrument must have the re- Signal Ground symbol. This symbol indicates quired knowledge of CNT-66. This knowledge can be that the signal ground of the connectors are in- gained by thoroughly studying this manual.

  • Page 7: Product Presentation

    Chapter 2 Product Presentation...

  • Page 8: General

    Product Presentation General Rear View The CNT-66 is a compact, high resolution, reciprocal Rear feet. Timer/Counter which performs many functions. A number of Screws for removing the cover. options are available i.e. HF-input, GPIB-interface and high External-reference-input, BNC connector. stability oscillator.

  • Page 9: Front View

    Product Presentation A T T x 1 A T T x 1 x 1 0 x 1 0 T R I G G E R L E V E L S E N S I T I V I T Y Figure 2-2 Front View Auto level, starts automatic trigger level setting.
  • Page 10 Product Presentation This page is intentionally left blank. 2-4 Front View...

  • Page 11: Installation

    Chapter 3 Installation...

  • Page 12: Unpacking

    Check List Has the Timer/Counter been damaged in transport? If it has, file a claim with the carrier immediately, and notify the Pendulum sales & service organization to make repair or re- placement of the instrument easier. – Check that the package contains the following items in addition to the Timer/Counter: –...

  • Page 13: Grounding

    Installing the Rack Mount Adapter The option 06 is a 19" wide and 2E (88 mm) high Rack Mounting Adapter. It can host one CNT-66 or CNT-69 Coun- ter. Check list Check that this box contains the following items:...
  • Page 14 Installation Figure 3-5 Fasten the counter with the locking bar. – Turn the bar until it locks in the notch in the shelf. – If your measuring cables are inside the rack, then push the BNC cables through the hole in the bracket before fit- ting the front plate.

  • Page 15: Operating Instructions

    Chapter 4 Operating Instructions...

  • Page 16: Using The Timer/Counter

    Operating Instructions Using the Timer/Counter CONTROL OPERATING THE DISPLAY GPIB-CODE CONTROL POWER, a two-position MEASURING TIME DISPLAY COMMON AUTO READ No control possi- SINGLE 0.2s HOLD B via A LEVEL LEVEL mechanical push-button. ble but D gives Depressed = ON, the same set- Released = OFF tings as after...
  • Page 17 Timer/Counter off and on again. If error code Error 02 = Measuring logic error 01 - 03 persists, call Pendulum service. Look on the last Error 03 = Internal bus error page in this manual for Phone No. and address.
  • Page 18 Operating Instructions CONTROL OPERATING THE DISPLAY GPIB-CODE CONTROL Move function cursor to MEASURING TIME DISPLAY COMMON AUTO READ FREQ C SINGLE 0.2s HOLD B via A LEVEL LEVEL FREQ C FREQ FREQ PERIOD RATIO TIME TOT A TOT A TOT A VOLT A MAX-MIN FUNCTION...
  • Page 19 Operating Instructions FUNCTION AND RANGE HINTS AND COMMENTS Reciprocal frequency measurement of the signal at In- put-C. Range: 70 to 1300 MHz When you select SINGLE, the Timer/Counter measures Use SINGLE when the input frequency is low. This short- one period, the range is: 100 ns to 200 000 000 s (about 6 ens the measuring time considerably since one cycle is years and four months!).
  • Page 20 Operating Instructions CONTROL OPERATING THE DISPLAY GPIB-CODE CONTROL Move function cursor to MAX VOLTAGE MIN VOLTAGE VMAX A, VOLT A MAX-MIN MEASURING TIME DISPLAY COMMON AUTO READ VMIN A SINGLE 0.2s HOLD B via A LEVEL LEVEL (VMAX B and VMIN B possible via Bus) FREQ...
  • Page 21 Operating Instructions FUNCTION AND RANGE HINTS AND COMMENTS The timer counter will measure the positive and negative The attenuator will switch in and out automatically when peak voltage an display them as voltage relative to 0 V. needed during voltage measurements regardless if AUTO LEVEL is selected or not.
  • Page 22 Operating Instructions CONTROL OPERATING THE DISPLAY GPIB-CODE CONTROL RESET/LOCAL, a short MEASURING TIME DISPLAY COMMON AUTO READ X starts a new SINGLE 0.2s HOLD B via A LEVEL LEVEL press is enough for Re- measurement. set. When the remote in- dicator is on, a press will GATE OPEN cause the counter to...
  • Page 24 Operating Instructions CONTROL OPERATING THE DISPLAY GPIB-CODE CONTROL One ATTx1/x10 push ATT ON button for each of input ATT OFF A T T x 1 A and B. Switch the indi- You must first x 1 0 cator ON to select 10 select input with times attenuation and INPA or INPB.
  • Page 25 Operating Instructions FUNCTION AND RANGE HINTS AND COMMENTS When the indicator in the button is OFF, the signal is If Auto Level or Volt is selected, the correct attenuator set- un-attenuated; the trigger level range is –5 V to +5 V and ting will be selected automatically.
  • Page 26 Operating Instructions CONTROL OPERATING THE DISPLAY GPIB-CODE CONTROL The READ LEVEL LEVEL A LEVEL B Use INPA? and push-button. When the MEASURING TIME DISPLAY COMMON AUTO READ INPB? to read SINGLE 0.2s HOLD B via A LEVEL LEVEL indicator is on, the dis- input settings to play shows the trigger the controler...
  • Page 27 Operating Instructions FUNCTION AND RANGE HINTS AND COMMENTS When active, trigger levels will be displayed according to Use Read-Level to check what trigger-levels Auto-Level this table: has selected. Auto Level Manual Level selected Level set using by Auto. Set A or SET B Level selected 0 V.

  • Page 28: Error Codes

    If the counter shows one of these error codes, try switching the counter off and on again. If error code 01-03 persists, call Pendulum service. Look on the last page in this manual for Phone No. and address. 4-14 Error Codes...

  • Page 29: Gpib-Interface Operation

    Chapter 5 GPIB-interface Operation...

  • Page 30: Introduction

    – Automatic un-addressing as talker when it is addressed The CNT-66 can be controlled by a computer (controller) via as a listener. the GPIB-interface option, option 04. All functions that can be controlled from the front panel can also be controlled via Listener Function, L4 the bus in a similar way, except the power switch.

  • Page 31: Connecting The Controller

    GPIB-interface Operation Connecting the NOTE: 31 is the bus command for “Untalk” and should not be used. If 31 is selected the counter will work Controller as if address 0 is selected. Talk-Only The bus interface connector is on the rear panel of the counter.

  • Page 32: Two Ways Of Programming

    GPIB-interface Operation Two Ways of Syntax Programming What is a Programming Command? The simplest way of programming the counter is by manu- ally setting up the measurement you want from the front A programming command consists of a header, addressing panel of the counter, then let the controller ask the counter the function you want, and a body instructing the function how it is set up.

  • Page 33: Selecting Output Separator

    GPIB-interface Operation Order of Commands in a Program How to Select Function Message Normally, the programming commands in a programming Standard Functions message can be placed in any order. Functions are selected by sending the appropriate function However, the following commands must always be placed command to the counter, e.g.

  • Page 34: Selecting Measuring-Time

    GPIB-interface Operation The counter will not return to the ‘bus only’ function when it Selecting Input settings returns to remote. To return to the ‘bus only’ function you must re-program the counter. Before selecting input settings you must tell the counter The specifications of some ‘bus-only’...

  • Page 35: Totalize Start/Stop

    GPIB-interface Operation Common B Command Comment Free-Run/Triggered via A COM ON The counter can work in two different ways: COM OFF Default Free-Run, where it starts a new measurement as soon as the previous measurement is finished. When COM ON is selected, the AC/DC and attenuator set- tings of Input-A will affect both channels.

  • Page 36: Service Request

    GPIB-interface Operation Bus Triggering Status Byte ‘X’ will always cause the counter to start a new measure- ment. X will work as group execute trigger, GET. ‘X’ must al- The counter sends its status byte to the controller on a serial ways be placed in the end of a program message.
  • Page 37 GPIB-interface Operation Possible Status Messages Measuring Result Ready indicates that the measurement and calculation of the result is completed and that the result is present in the output buffer. If SRQ for is selected for this Normal Measurement event, or Free-run is OFF, the counting will stop until the controller has read the result.

  • Page 38: Output Mode

    GPIB-interface Operation Output Mode Short Short format means that function command and leading ze- ros are not sent to the controller. When you select short out- Setting the output mode selects the format in which the put format, the number of digits may vary depending on the counter will output measuring results to the controller.
  • Page 39 GPIB-interface Operation Output Format Multiplier The second letter (M) in the output data represents a multi- The output format will always be two letters followed by 12 plier which you must multiply the results by before present- hexadecimal digits. The two letters will tell the controller ing it.

  • Page 40: Bus Learn

    GPIB-interface Operation This number is multiplied by multiplier ‘O’ to get the measur- NOTE: The query command must always be the last ing result: command in a program message. If AUTO or COM is switched ON, the responses to 600 0006209 10 6000 006209 6 000006209 10 ´...

  • Page 41: Summary Of Bus Commands

    GPIB-interface Operation Measurement Control Commands Summary of Bus Commands GATE OPEN Starts the totalizing in TOTM A and TOTM B GATE CLOSE Stops totalizing Function Selecting Commands MTIME <num> Set Measuring-time. <num> = 0.01 to 10 s. 0 = SINGLE FREQ A Frequency measurement on Input-A FRUN ON...

  • Page 42: Programming Examples

    The output rate is approximately 125 readings/second in this example. .Example of a result: ! DEMO PROGRAM DUMP MODE MEASURING TIME WILL BE ! CNT-66 WITH HP85 AS SELECTED BY HP85 (SINGLE)! ! CONTROLLER ANSWER Y WHEN READY TO START! ! DUMP MODE WITH FREE RUN ON...
  • Page 43 MTIME 1.00,FRUN ON This program example illustrates the ‘program data out’ fea- TOUT 00.0 ture of CNT-66. By asking a set of queries, the counter re- MSR 000,OUTM 000 sponds with its current setup. The output format of these EIO OFF,SPR 010...
  • Page 44 This program prompts the user to input a programming se- This example runs on an IBM PC with an ‘IBM General Pur- quence. The sequence is then sent to the CNT-66 and the pose Interface Bus Adapter’ instead of the PM 2201 inter- corresponding measuring result is read.

  • Page 45: Performance Check

    Chapter 6 Performance Check...
  • Page 46 To check the accuracy of the oscillator, use a reference with Common via A an accuracy of at least 3*10 . The Pendulum 6688 OCXO Frequency Reference meets this requirement, if calibrated – Select RATIO A/B.
  • Page 47 Performance Check – Sensitivity and Set TRIGGER LEVEL to 1.00 V for both inputs. – Frequency Range Adjust the duration time from the pulse generator to give a value of 0.1 ms on the counter display. in RATIO A/B – Select negative SLOPE A and positive SLOPE B.
  • Page 48 Performance Check – EXT REF Sensitivity The “start counting” level shall be more than 1 dB below the specified limit shown in the figure. – Repeat this procedure with the following frequencies: – 100, 200, ... up to 1300 MHz GPIB Interface (Option 04) Type on the...

  • Page 49: Calibration And Adjustment

    Chapter 7 Calibration and Adjustment...

  • Page 50: Calibration

    Calibration and Adjustment Calibration How often should you calibrate? In the table below you can see the uncertainty of your time base oscillator for various MTBRC (Mean Time Between To maintain the performance of the timer/counter, we rec- Recalibration) intervals. ommend that you calibrate the timebase of your instrument every year, or more often if you require greater timebase ac- Compare the requirements of your application with the val-...

  • Page 51: Timebase References

    For required test equipment, see Performance Check. Frequency Reference Figure 7-2 Location of the CALIB-Button The Pendulum 6688 frequency standard or the option 40 oven-enclosed oscillator available in some Pendulum counters – Wait about 20 seconds, until the display shows meet the requirement, if calibrated within the last 12 months.
  • Page 52 Calibration and Adjustment This page is intentionally left blank. 7-4 Timebase References...

  • Page 53: Specifications

    Chapter 8 Specifications...

  • Page 54: Measuring Functions

    Specifications LSD Displayed (Ratio B/A): Measuring Functions 2 5 . meas time FREQ B ´ (0.2, 1, or 10 s measuring time) Frequency A or C LSD Displayed (Ratio A/B Single, and Ratio B/A Single): (frequency B via GPIB/IEEE-488 only) RATIO <...

  • Page 55: Input-A And Input-B

    Specifications Manual Mode: to 60 mVrms typ., 120 MHz to 160 MHz Event counting is controlled by the (at room temp.) START/STOP button. Sequential Attenuation: xl or x10, switch selectable or AUTO start-stop counts are accumulated. Trigger Slopes: Positive or negative RESET closes the gate and resets the timer/counter to zero.

  • Page 56: Auxiliary Functions

    Specifications Auxiliary Functions Definitions Power On/Off LSD Displayed Switches counter power on/off. At power up a self-test is LSD = unit value of the least significant digit displayed. All made and the counter is set to default settings. calculated LSDs (see Measuring Functions section) should be rounded to the nearest decade (e.g., 0.3 Hz is rounded Default Settings to 0.1 Hz and 5 Hz to 10 Hz) and cannot exceed the 9th...

  • Page 57: General Specifications

    ± signal slope A V s ´ meas time Line Voltage: 115V or 230Vrms ± 15%; 45 Hz to 440 Hz; 20 VA CNT-66 including all Ratio A/B: options Safety: Compliant to CE: noise voltage B Vp p EN 61010-1 (1990) + A1 (1992) Cat II ±...

  • Page 58: Environmental Data

    Specifications Output Format Environmental Data Function code 3 to 6 characters Temperature Normally space. O on overflow Operating: 0°C to + 50° Measuring result Storage: –40°C to +70° Exponent pointer Altitude Exponent sign (+ or -) Operating: 5000m (53.3 kN/m Exponent value 0 to 9 Storage: 15,000m (15.2 kN/m...

  • Page 59: Ordering Information

    Option 09 Carrying case Rack Mounting Adapter, Option 06 The option 06 is a 19" wide Rack Mounting Adapter. It can host one CNT-66 or CNT-69 Counter only. High stability time-base, Option 07 See specifications for optional MTCXO time-base. Carrying Case, Option 09 The option 09 is a leather-like carrying case, for protection of the counter during transportation.
  • Page 60 Specifications This page is intentionally left blank. 8-8 Ordering Information...

  • Page 61: Appendix

    Chapter 9 Appendix...

  • Page 62: Checking The Sensitivity Of Counters

    Appendix Checking the Sensitivity Preparations Connect the instruments as illustrated in the figure above. of Counters Turn off AUTO and set the counter to maximum sensitivity. Method 1 Introduction – Adjust the amplitude of the signal-source to the minimum level accepted by the counter. The sensitivity of a counter is normally specified as the –...

  • Page 63: Service

    Chapter 10 Service...

  • Page 64: Sales And Service Office

    Service Sales and Service office For additional product information, customer support and service, please contact Pendulum Instru- ments AB at the following address: Pendulum Instruments AB Box 20020 SE-161 02 Bromma Sweden Visit address: Karlsbodavägen 39, Bromma Phone: +46 (0)8 5985 1000...

  • Page 65: Guarantee Statement

    Pendulum Instruments determines that the product is defective and that the failure has not been caused by misuse, alteration or abnormal operation.
  • Page 66 Service This page is intentionally left blank.

  • Page 67: Index

    Chapter 11 Index...
  • Page 68 Index Index Controls operation ....... . . 4-2 Abnormal bit Coupling Status byte From GPIB .
  • Page 69 Index Frequency C Listener function....... 5-2 Local ........4-8 GPIB code .
  • Page 70 Index Starting a new measurement Reset Status byte Rack mount adapter GPIB........5-8 installation .

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