FLUKE 5700A, 5720A Operator 电路图.pdf

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1、PN 601648 May 1996 1996 Fluke Corporation, Inc. All rights reserved. Printed in U.S.A. 5700A/5720A Series II Multi-Function Calibrator Operator Guide RadioFans.CN 收音机爱 好者资料库 RadioFans.CN 收音机爱 好者资料库 1 Contents What is in this Guide? . 2 Safety Summary. 2 P Fuse and Line Voltage . 4 Basic Operation. 5

2、 A Short Calibration Exercise. 5 Warming up the Calibrator . 5 Exercise: Running dc Zero Calibration. 6 Connecting a Meter. 6 Applying a dc Voltage . 7 Checking the Calibrator Uncertainty . 7 Exercise: Activating Error Mode . 8 Checking the Meters Higher and Lower Ranges. 8 Exercise: Applying an ac

3、Voltage . 9 Front Panel Features. 10 Output Display (Left Side) . 10 Control Display (Right Side). 10 Display Screen Saver. 11 Front Panel Keys . 12 Front Panel Connectors . 21 Rear Panel Features . 23 Rear Panel Connectors. 23 Switches and Fuse Holder. 26 Cable Recommendations. 27 Connecting to a U

4、UT (Unit Under Test) . 28 Using Error Mode . 35 Operating in Remote . 37 RS-232-C Interface Parameters. 38 RadioFans.CN 收音机爱 好者资料库 2 What is in this Guide? The Operator Guide begins with safety information, a short meter calibration exercise for new users, then continues with a condensation of infor

5、mation from the Operator Manual. For complete information about the Calibrators features, functions, and operating procedures, refer to the Operator Manual. Safety Summary Warning Lethal voltage may be present on the terminals. Observe all safety precautions in this guide. To avoid electrical shock

6、hazard, the operator should not electrically contact the OUTPUT HI or SENSE HI binding posts. During operation, lethal voltages of up to 1100V ac or dc may be present on these terminals. Whenever possible, keep one hand away from the equipment to reduce the hazard of current flowing through vital or

7、gans of the body. Symbols Marked on Equipment Warning - Risk of electric shock. QGround Protective ground (earth) terminal. P Attention Refer to the manual for information about this feature. This symbol appears on the rear panel ground terminal and by the fuse holder. Use the Proper Fuse To avoid f

8、ire hazard, use only the fuse specified on the line voltage selection switch label. 3 Safety Summary (cont.) Grounding the Calibrator The Calibrator is a Safety Class I (grounded enclosure) instrument. The enclosure is grounded through the grounding conductor of the power cord. To avoid electrical s

9、hock, plug the power cord into a properly wired earth grounded receptacle before making any connections to the Calibrator terminals. A protective ground connection by way of the grounding conductor in the power cord is essential for safe operation. Do Not Remove the Cover To avoid personal injury, d

10、o not remove the Calibrator cover. Do not operate the Calibrator without the cover properly installed. There are no user-serviceable parts inside the Calibrator, so there is no need to ever remove the cover. 4 P Fuse and Line Voltage The correct fuse type for each voltage selection is indicated on t

11、he rear panel as shown in the following figure. VOLTAGE SELECTION FUSE-F1 T 125A 250V (SB) 100V S2S3S4 110V 115V 120V VOLTAGE SELECTION FUSE-F1 T 125A 250V (SB) 200V S2S3S4 220V 230V 240V CAUTION FOR FIRE PROTECTION REPLACE ONLY WITH A 250V FUSE OF INDICATED RATING. VOLTAGE SELECTION FUSE-F1 T 125A

12、250V (SB) 100V S2S3S4 110V 115V 120V VOLTAGE SELECTION FUSE-F1 T 125A 250V (SB) 200V S2S3S4 220V 230V 240V CAUTION FOR FIRE PROTECTION REPLACE ONLY WITH A 250V FUSE OF INDICATED RATING. Line Power Label and Switch Locations 5 Basic Operation To set the output, simply press the following sequence of

13、keys to select an output function and amplitude: numeric keys multiplier function E O For example, to set the output to 10 mV dc, press: 1 0 m V E O To set an ac output, press the following additional keys: numeric keys multiplier H E For example, to change the present 10 mV dc to 10 mV ac 1.8 kHz,

14、press: 1 . 8 K H E To change the output back to dc, press: 0 H E or + E A Short Calibration Exercise If you are not familiar with the Calibrator, you will find that the following exercise quickly teaches you some important front panel operations. Warming up the Calibrator When you first turn the Cal

15、ibrator on, you should let it warm up for 30 minutes. This ensures that the Calibrator meets or exceeds its specifications. 6 Exercise: Running dc Zero Calibration DC Zero is a brief internal process that removes offset errors. The specifications require that you run dc Zero at least every 30 days.

16、To run dc Zero, press the following sequence of softkeys: Setup Menus Cal Zero Press any key, then press P twice to return to normal operation. Connecting a Meter Typical connections for handheld and benchtop meters are shown on the next page. The diagrams show the use of Fluke Model 5440-7002 Low T

17、hermal Cables. Other types of cable may be used for this exercise. To connect either type of meter, proceed as follows: 1. Verify that the Calibrator is on, and is in standby mode (STANDBY indicator lit). If the Calibrator is not in standby, press r. 2. Set the meter to the lowest range that reads 1

18、0V dc. 3. Connect the shield lead (if your cables are shielded) to V GUARD on the Calibrator. 4. Verify that both X and x are off. Press them if they are lit. 5. Connect the meter input LO to the Calibrator OUTPUT LO. 6. Connect the meter input HI to the Calibrator OUTPUT HI. 7 Exercise: Connecting

19、a Meter (cont.) HI HI LO LO HI AUX CURRENT GUARD GROUND WIDEBAND Calibrator 10A 300mA V COM DMM NC EX SNS : OFF EX GRD : OFF OUTPUT V A SENSE V HI HI LO LO HI OUTPUT V A SENSE V AUX CURRENT GUARDGROUND WIDEBAND Calibrator DMM INPUT NC EX SNS : OFF EX GRD : OFF Applying a dc Voltage Apply 10V dc to t

20、he meter by pressing the following sequence of keys: 1 0 V E O Checking the Calibrator Uncertainty Press s. The total uncertainty for the 10V you are applying to the meter is displayed on the Control Display (the large dot-matrix display on the right side of the front panel). This number depends on

21、the setting of the calibration cycle and specification confidence level in a setup menu. Press P to clear the uncertainty display. 8 Exercise: Activating Error Mode Chances are the meter reads something other than exactly 10V. To quickly check the error of the meter, turn the rotary knob to obtain a

22、 meter reading of exactly 10V, and read the error off the Control Display. Turning the knob is all it takes to activate error mode. When you turn the knob, the least significant digit is highlighted. This digit changes as you turn the knob. To change a higher order digit, thereby speeding up the adj

23、ustment rate, press . The error on the Control Display is a combination of offset, scale, and linearity errors. You can view component parts of the error by pressing o and S. Checking the Meters Higher and Lower Ranges To check the meter error at 100V dc, first set the meter range (if applicable) to

24、 the lowest range that reads 100V. Press Y O. This sets a new reference equal to ten times the previous reference of 10V dc. (Pressing O was necessary because the Calibrator goes into standby when it crosses the safety threshold from below 22V to over 22V.) Turn the rotary knob to re-activate error

25、mode and determine the meter error at 100V. Now press Z Z. Set the meter range switch (if applicable) to the lowest range that reads 1V. To end the error mode session, press E. This recalls the reference value and exits error mode. Press r to set the output to 0 mV dc in standby. 9 Exercise: Applyin

26、g an ac Voltage There is no “ac mode” switch on the Calibrator. You change a dc output to ac by entering a frequency through the keypad and pressing E. To test the meter at 10V at 1 kHz, set the meter to read 10V ac, press 1 0 V, then 1 K HEO. Adjust the rotary knob for a reading on the meter of exa

27、ctly 10V. To test the meters flatness, press a. The 0.1 Hz digit is highlighted. Press four times. Turn the knob to change the 1 kHz digit until the Calibrator is set to 10 kHz. Press a and turn the knob again to check the meters accuracy at 10 kHz. Each time you change the frequency, you need to wa

28、it for the Calibrator output to settle (the “u” annunciator will go out). This ends the front panel exercise. To zero the output and go to standby, press r. 10 Front Panel Features Following is a brief description of the Calibrators front panel features. Output Display (Left Side) Shows output ampli

29、tude and frequency. The top line shows the active output value in up to eight digits, plus a polarity sign. The bottom line shows output frequency in five digits. Annunciators below the amplitude line on the output display indicate the following active conditions: OPERATELit when an output is active

30、 at the binding posts or auxiliary amplifier. STANDBYLit when the Calibrator is in standby. ADDRLit when the Calibrator is addressed over the IEEE-488 interface. LCKLit when the Calibrator output is phase locked to a signal at the rear panel PHASE LOCK connector. SHFLit when the Calibrator output ha

31、s a programmed phase difference with a signal at the real panel VARIABLE PHASE OUT connector. u(Unsettled) Lights when the output is changed, and remains lit until the output settles to within specification. Control Display (Right Side) Shows data entries, UUT error adjustments, softkey labels, and

32、other prompts and messages. Each softkey label identifies the functions of the softkey that appears directly below it. All of the softkey labels that appear on the display at once are referred to as a menu. When you access the function provided through the softkeys, you open up other menus, containi

33、ng new softkey labels. 11 Display Screen Saver Both the Output and Control displays blank automatically after 30 minutes of inactivity, unless the Calibrator is in one of the operating states that overrides the screen saver. If the screen saver has activated, you can restore the display by pressing

34、C. Pressing another key or turning the knob restores the display and performs the command sent by the key or knob. The screen saver does not operate: if any part of the Setup menu is displayed. during remote operation. during calibration or diagnostics. when an error message is displayed. 12 Front P

35、anel Keys O Toggles the Calibrator between operate and standby modes. In standby mode, the OUTPUT binding posts are internally disconnected from the Calibrator. The Calibrator powers up in standby mode. The Calibrator automatically switches to standby mode when: r is pressed. the Calibrator is sourc

36、ing an ac or dc voltage below 22V, and a voltage greater than 22V is selected. the output function is changed, e.g., from dc current to ac current. the output location is changed. The Calibrator does not switch to standby when the voltage is switched from any ac or dc voltage to an ac or dc voltage

37、less than 22V. 13 Front Panel Keys (cont.) X Opens and closes an internal connection between the SENSE and OUTPUT binding posts. The Calibrator powers up with these two binding posts connected internally (the SENSE binding posts are open circuited), and the X indicator off. Toggling X on (so it ligh

38、ts) disconnects the sense lines from the OUTPUT binding posts. External sensing should be used in the following function under the stated conditions. In the dc voltage function when the UUT draws enough current to produce a significant voltage drop in the cables. In the resistance function when the

39、UUT has a four-wire input and the Calibrator is set to 100 k or less. External sensing can also be used in the two- wire ohms function to activate two-wire compensation circuitry to the UUT terminals. 14 Front Panel Keys (cont.) x Opens and closes an internal connection between the V GUARD (voltage

40、guard) and OUTPUT LO. The Calibrator powers up with the V GUARD internally connected to OUTPUT LO and the x indicator off. Toggling x on (so it lights) disconnects OUTPUT LO from the V GUARD. The V GUARD binding post provides an external connection point for the voltage internal guard. For a UUT wit

41、h ungrounded inputs, the V GUARD should be connected to LO internally. (The EX GRD key is toggled off.) For a UUT with a grounded input, the GUARD may be externally connected to the grounded UUT input. (The EX GRD key is toggled on.) w Enables and disables the -03 Wideband AC option and sets the Cal

42、ibrator to standby mode. When enabled, the ac voltage output over the range of 10 Hz to 30 MHz is available at the front panel WIDEBAND connector. The wideband function is disabled whenever w is toggled off, or when another function (such as current) is selected. 15 Front Panel Keys (cont.) B Enable

43、s or disables output from an amplifier, when it would not otherwise be automatically selected. Sets the Calibrator to standby if this selection moves the output location. When available, an amplifier is automatically selected for output settings that exceed Calibrator capabilities, but fall within t

44、he limits of the selected amplifier. The B key is only needed to activate an amplifier for an output setting that is available from either the Calibrator or from the amplifier. This allows you to take advantage of amplifier capabilities other than extended range (i.e. higher compliance voltage). For

45、 both voltage and current, the amplifier is assumed to be a 5725A unless another model is designated in the Setup menus. P Aborts the current operation of the Calibrator and recalls the previous menu. Some menus display a more specific label for this key, such as “DONE setting up.” Softkeys u The fu

46、nctions of the five unlabeled softkeys are provided through each menu in the Control Display, with each function located directly above the softkey that activates that function. Many of these functions access new menus that contain a new set of functions for the softkeys, providing access to many ca

47、pabilities and configuration options through the menu tree. POWER switch Turns the power on and off. 16 Front Panel Keys (cont.) These keys are the output adjustment controls. If any of these keys are pressed, or if the knob is turned, a digit on the Output Display becomes highlighted. Turning the knob adjusts the output value. An error display appears on the Control Display, showing the difference between the original (reference) output and the new (adjusted) output. The