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Fluke PM6669, Руководство оператора, Страница: 20 / 48

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FUNCTION AND RANGE

HINTS AND COMMENTS

For frequency-, period-, and ratio measurements:

Select AC coupling and set the sensitivity so that the
hysteresis band of the Frequency Counter is about
half the amplitude of the signal.

For time measurements:

Select DC coupling and set the trigger level to the de-
sired level using the 1 V/divistion scale on the front
panel.

1.

Set the sensitivity knob fully counter clockwise.

2.

Turn it until the input triggers.

3.

Continue turning to the 20 mV

RMS

 position, or to the

position where the display turns unstable due to noise.

4.

Set the knob to the position inbetween these two
points.

You will have a stable reading.

If the sensitivity is too high, the Frequency Counter
will be triggered by noise and interference instead of
by the signal.

The filter works on Input-A where it suppresses sig-
nals with higher frequencies than 50 kHz.

Filter suppression: 40 dB at 1 MHz

The filter can also be used to suppress HF-
interference on signals with higher frequencies than
50 kHz, but then the sensitivity of the input will be
reduced.

NOTE:

Never use the filter when measuring TIME A-B
since the filter delays the signal on Input-A.

The Frequency Counter automatically detects if a suit-
able signal is connected to the EXT- REF Input-con-
nector.

Suitable signal: 
 10 

±

 0.1 MHz, 0.5 to 15 V

RMS

 Sine wave.

Use external reference when the measurement
requires ultra-high stability. 

The Frequency Counter must still have the internal
time base even if an external reference frequency is
used.

If single is selected, the EXT REF indicator on the
display is not switched on until after the first
measurement.

OPERATING INSTRUCTIONS

Page: 19

PM 6669 - OPERATORS MANUAL

Содержание PM6669

Страница 1: ...Universal Frequency Counter PM6669 Operators Manual...

Страница 2: ...on 22 Two Ways of Programming 23 Syntax 23 Selecting Output Separator 24 How to Select Function 24 Selecting Measuring Time 24 Selecting Triggering 25 Totalize Start Stop 25 Free Run Triggered 25 Serv...

Страница 3: ...where necessary throughout the manual Do not carry out repairs or adjustments to the Frequency Counter without reading the Service Manual which contains the relevant warnings for such activities CAUTI...

Страница 4: ...View A Rear feet B Screws for removing the cover C External reference input BNC connector D Voltage range selector E Power inlet socket F GPIB interface connector optional G GPIB address selector opt...

Страница 5: ...the right to the left of the display No rounding off U Trigger level setting button V Tilting support The selected function is indicated on the display A short press on the button moves the cursor on...

Страница 6: ...ction Set the Frequency Counter to the local line voltage before connecting it As delivered the Frequency Counter may be set to either 115 V or 230 V The setting is indicated on the voltage range sele...

Страница 7: ...M 9691 oven enclosed oscillator used in Fluke counters version 5 meet this requirement if calibrated Preparations If you remove the cover when counter has been switched on the temperature of the MTCXO...

Страница 8: ...display shows 10 0000000 MHz Now the oscillator is calibrated Switch OFF the counter and disconnect the 10 MHz ref erence Fit the cover CALIB button Figure 6 Location of the CALIB Button INSTALLATION...

Страница 9: ...jumps back to the leftmost position and continues from there One code for each function see below Move function cursor to FREQ A FREQ A ON STAND BY TRIGGER LEVEL A HOLD DISPL MEASURING TIME 10s 1s 0...

Страница 10: ...the secondary side of the transformer The power cable must be disconnected from the line outlet socket if it is necessary to completely isolate the Frequency Counter from the line Error 01 RAM memory...

Страница 11: ...A TOT A PER A RPM A A0 FREQ A A0 FREQ B FREQ A FREQ FUNCTION AUTO 0 FUNCTION TRIGGER LEVEL A HOLD DISPL MEASURING TIME 10s 1s 0 2s SINGLE REF EXT A WIDTH A TOT A PER A RPM A A0 FREQ A A0 FREQ B FREQ...

Страница 12: ...s function can e g be used in a radio to display the received frequency Set the intermediate frequency as the constant A0 Select FREQ A A0 and measure the frequency of the local oscillator and the dis...

Страница 13: ...A0 FREQ A A0 FREQ B FREQ A FREQ FUNCTION AUTO ms 0 TIME MEAS TIME MEAS TRIGGER LEVEL A HOLD DISPL MEASURING TIME 10s 1s 0 2s SINGLE REF EXT A WIDTH A TOT A PER A RPM A A0 FREQ A A0 FREQ B FREQ A FREQ...

Страница 14: ...ignal is longer than the set Measuring time the main gate does not close again until the period is completed If you wish to do one measurement instead of repetitive measurements see DISPL HOLD For PER...

Страница 15: ...TIME 10s 1s 0 2s SINGLE REF EXT A WIDTH A TOT A PER A RPM A A0 FREQ A A0 FREQ B FREQ A FREQ FUNCTION AUTO kHz 0 LEVEL A TRIGGER TRIGGER LEVEL A HOLD DISPL MEASURING TIME 10s 1s 0 2s SINGLE REF EXT A W...

Страница 16: ...t blinking again If it does leave the trigger level in that position otherwise return to trigger level e Turn the sensitivity down until the gate indicator stops blinking then up slightly until it sta...

Страница 17: ...on or off DISPL HOLD when de pressed Not bus con trollable but Free run OFF will give a similar function See GPIB bus operation Connect the signal to INPUT A via a BNC cable Connect the signal to INPU...

Страница 18: ...NCTIONS FREQ A A0 Use this input for all functions except FREQ B Range 10 Hz to 160 MHz Impedance 1 M 30 pF Min pulse duration 4 ns At higher frequencies use a 50 termination type PM 9585 to avoid int...

Страница 19: ...us One two position switch Depress to switch on the FILTER and relase to switch it off Not bus controllable Connect an external 10 MHz frequency source to the BNC connector on the rear panel of the Fr...

Страница 20: ...erference instead of by the signal The filter works on Input A where it suppresses sig nals with higher frequencies than 50 kHz Filter suppression 40 dB at 1 MHz The filter can also be used to suppres...

Страница 21: ...bat tery will never reach the capacity of a new one If you must store your counter for some time without us ing it store it in a cool and dry place Leave the counter with the mains cable connected if...

Страница 22: ...ta tion Systems Reference Manual Summary Description Code Source handshake SH1 Acceptor handshake AH1 Control function C Talker Function T5 Listener function L4 Service request SR1 Description Code Re...

Страница 23: ...11100 9 01001 19 10011 29 11101 30 11110 Factory setting NOTE 31 is the bus command for Untalk and should not be used If 31 is selected the counter will work as if address 0 is selected Talk Only The...

Страница 24: ...h speed dump OFF and MTCXO compensation ON All functions and commands in the checklist will be ex plained later NOTE You only have to program the changes from the previous set up Syntax What is a Prog...

Страница 25: ...hes it off Default setting is EOI OFF The selected separator and EOI will not be altered by LOCAL from the front panel nor by LOCAL or Device clear from the bus How to Select Function Standard Functio...

Страница 26: ...e measuring re sult can only be read once 2 Triggered where the counter waits for trigger com mand GET or X from the controller before it starts a measurement When the measurement is completed the cou...

Страница 27: ...he counter There are two types of status bits A conditional bit indicates the current condition of what its monitoring all the time An event bit indicate that an event has occurred When the event occu...

Страница 28: ...on t care Comment 0 00000000 Preparing a measurement or High speed dump or Volt measurements in progress 2 00000010 XX0XXX1X Preparations ready If Free run OFF Deci mal Binary 76543210 Important bits...

Страница 29: ...lected all calcula tions are left to the controller instead and the counter can concentrate on measuring at a rate of over 100 measurements second High speed dump cannot be used for voltage measure me...

Страница 30: ...s must be converted to a decimal number and entered in the formula 683Hex 6 162 8 16 3 1667decimall The result is 1667 10 7 which you must multiply by Mul tiplier P which is 1 to get the measuring res...

Страница 31: ...s can easily be edited in the controller NOTE MEAC and BUS result in a response sent as two lines each terminated by the selected separator NOTE The counter will stop measuring until all lines of the...

Страница 32: ...ps totalizing MTIME num Set Measuring time num 0 01 10 s 0 SINGLE FRUN ON Selects Free Run FRUN OFF Selects Triggered mode TRIG OFF Selects Free Run TRIG ON Selects Triggered mode TOUT num Sets Time O...

Страница 33: ...10 F TIME 220 TIME 230 DISP READY ELAPSED TIME F E s 240 SHOW 5 RESULTS 250 DISP FIRST 5 RESULTS 260 FOR K 1 TO 5 270 ENTER Z B 280 GET FORMULA CHARACTER 290 F B 1 1 300 GET MULTIPLYER CHARACTER 310 M...

Страница 34: ...program example illustrates the program data out feature of PM 6669 By asking a set of queries the counter responds with its current setup The output for mat of these answers to the queries is identic...

Страница 35: ...with an IBM General Purpose Interface Bus Adapter instead of the Fluke PM 2201 interface The following set of device parameters is suitable for a PM 6669 with address 10 The device parameters are set...

Страница 36: ...nd shown on the dis play as revolutions per minute RPM Range 6 RPM to 720 106 RPM Period A Range 8 ns to 2 108 s Mode Single period measurement SINGLE or period aver age measurement at 0 2 1 or 10 s M...

Страница 37: ...specifications Input A Frequency Range 0 Hz to 160 MHz Sensitivity Sine 10 mVRMS 10 Hz to 120 MHz 30 mVRMS typically 120 MHz to 160 MHz Pulse 30 mVRMS 0 1 Hz to 120 MHz Coupling AC Impedance 1 M 30 pF...

Страница 38: ...C to 50 C Storing 40 C to 70 C Altitude Operating 5000 m 53 3 kN m2 Storing 15000 m 15 2 kN m2 Humidity Operating 10 to 90 RH no condensation Storing 5 to 95 RH Vibration Test According to IEC 68Fc Bu...

Страница 39: ...of 0 1 seconds is used Displ Hold Store A0 The DISPL HOLD STORE A0 button has two functions DISPL HOLD The result of the current measurement will be frozen on the display A new measurement starts when...

Страница 40: ...0 and 6 10 7 to 1 6 108 Ratio B A 0 and 6 10 8 to 1 6 107 Ratio C A C B 8 to 4 109 Max Data Output Rate Normal mode gives 5 read ings s High speed dump gives 100 readings second The highest output rat...

Страница 41: ...9 6 As above but including GPIB interface PM 9604 Example PM 6669 416 means a PM 6669 frequency counter including both an 160 MHz and an 1 3 GHz input channel an uncompensated oscillator and a GPIB in...

Страница 42: ...ensitivity is measured Recommended Instruments Signal source with a 50 output impedance 350 MHz oscilloscope with a 50 input impedance BNC T piece Two BNC cables one short and one long High Impedance...

Страница 43: ...it to the oscilloscope Read the amplitude on the oscilloscope Check that the reading is the same as or less than the sensitivity level in the counter specifications Method 2 Connect the signal source...

Страница 44: ...37 EOI mode See Output separator Error codes 9 20 External reference input Connection 6 18 Description of function 19 Location of connector 3 Specification 37 F Filter Specification 36 Filter On Off S...

Страница 45: ...ing 8 Power inlet socket Location of 3 PRODUCT PRESENTATION 3 4 Programming check list 23 Pwidth A See Width A Q Queries GPIB 30 R Rack mount kit Specification 39 Rear feet 3 Remote local 22 Removing...

Страница 46: ...era 21 No 39A 21 Of 101 Ap Aereo 29583 Bogota Phone 57 1 287 5424 Fax 57 1 287 2248 Costa Rica Electronic Engineering S A Service Center Carretera De Circunvalacion Sabanilla Av Novena P O Box 4300 10...

Страница 47: ...22 65 3407 Pakistan Philips Electrical Industries Of Pakistan Ltd Islamic Chamber of Commerce St 2 A Block 9 KDA Scheme 5 Clifton Karachi 75600 Phone 92 21 587 4641 Fax 92 21 577 035 Peru Importacione...

Страница 48: ...ite 112 Carrollton TX 75006 Phone 1 214 406 1000 Fax 1 214 406 1072 E Mail oldman wz fluke com Fluke Corporation Service Center Orlando 550 S North Lake Blvd Altamonte Springs FL 32701 5227 Phone 1 40...

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