FLUKE 5720a___ogeng0100 电路图.pdf

《FLUKE 5720a___ogeng0100 电路图.pdf》由会员分享，可在线阅读，更多相关《FLUKE 5720a___ogeng0100 电路图.pdf（24页珍藏版）》请在收音机爱好者资料库上搜索。

1、 PN 3474006 May 1996, Rev. 1, 5/09 2009 Fluke Corporation. All rights reserved. Printed in USA. All product names are trademarks of their respective companies. 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 i Table of Contents Title Pag

2、e What is in this Guide?. 1 Safety Summary. 1 WFuse and Line Voltage . 2 Basic Operation. 2 A Short Calibration Exercise. 2 Warming up the Calibrator. 3 Exercise: Running dc Zero Calibration. 3 Connecting a Meter . 3 Applying a dc Voltage. 3 Checking the Calibrator Uncertainty. 4 Exercise: Activatin

3、g Error Mode. 4 Checking the Meters Higher and Lower Ranges. 4 Exercise: Applying an ac Voltage. 4 Front Panel Features . 5 Output Display (Left Side). 5 Control Display (Right Side). 5 Display Screen Saver. 5 Front Panel Keys . 5 Front Panel Connectors . 10 Rear Panel Features . 11 Rear Panel Conne

4、ctors . 11 Switches and Fuse Holder. 12 Cable Recommendations . 13 Connecting to a UUT (Unit Under Test) . 14 Using Error Mode. 19 Operating in Remote. 19 RS-232-C Interface Parameters . 20 RadioFans.CN 收音机爱 好者资料库 5700A/5720A Operator Guide ii Series II Multi-Function Calibrator What is in this Guid

5、e? 1 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 information from the Operator Manual. For complete information about the Calibrators features, functions, and operating procedures, r

6、efer to the Operator Manual. Safety Summary WXWarning Lethal voltage may be present on the terminals. Observe all safety precautions in this guide. To avoid electrical shock hazard, the operator should not electrically contact the OUTPUT HI or SENSE HI binding posts. During operation, lethal voltage

7、s 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 organs of the body. Symbols Marked on Equipment X Warning - Risk of electric shock. J J Ground Protective ground (earth) termina

8、l. W 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 fire hazard, use only the fuse specified on the line voltage selection switch label. WX Grounding the Calibrator The Calib

9、rator is a Safety Class I (grounded enclosure) instrument. The enclosure is grounded through the grounding conductor of the power cord. To avoid electrical shock, plug the power cord into a properly wired earth grounded receptacle before making any connections to the Calibrator terminals. A protecti

10、ve ground connection by way of the grounding conductor in the power cord is essential for safe operation. WXDo Not Remove the Cover To avoid personal injury, do not remove the Calibrator cover. Do not operate the Calibrator without the cover properly installed. There are no user-serviceable parts in

11、side the Calibrator, so there is no need to ever remove the cover. 5700A/5720A Operator Guide 2 WWFuse and Line Voltage The correct fuse type for each voltage selection is indicated on the rear panel as shown in the following figure. VOLTAGE SELECTION FUSE-F1 T 125A 250V (SB) 100V S2S3S4 110V 115V 1

12、20V 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 250V (SB) 100V S2S3S4 110V 115V 120V VOLTAGE SELECTION FUSE-F1 T 125A 250V (SB) 200V S2S3S4 220V 230V 240V CAUTION

13、 FOR FIRE PROTECTION REPLACE ONLY WITH A 250V FUSE OF INDICATED RATING. 5720og01.eps Line Power Label and Switch Locations Basic Operation To set the output, simply press the following sequence of keys to select an output function and amplitude: numeric keys multiplier function E O For example, to s

14、et 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, press: 1 . 8 K H E To change the output back to dc, press: 0 H E or + E A Short Calibration Exercise If

15、 you are not familiar with the Calibrator, you will find that the following exercise quickly teaches you some important front panel operations. Series II Multi-Function Calibrator Exercise: Running dc Zero Calibration 3 Warming up the Calibrator When you first turn the Calibrator on, you should let

16、it warm up for 30 minutes. This ensures that the Calibrator meets or exceeds its specifications. 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. To run dc Zero, press the fol

17、lowing 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 Thermal Cables. Other type

18、s 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 10V dc. 3. Connect the shi

19、eld 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. HI HI LO LO HI AUX CURRENT GUARD GROUND WIDEBAND

20、 Calibrator 10A 300mA V COM DMM NC EX SNS : OFF EX GRD : OFF HI HI LO LO HI SENSE V AUX CURRENT GUARDGROUND WIDEBAND Calibrator DMM INPUT NC : OFF EX GRD : OFF EX SNS OUTPUT VA SENSE V OUTPUT VA 5720og10.eps Applying a dc Voltage Apply 10V dc to the meter by pressing the following sequence of keys:

21、1 0 V E O 5700A/5720A Operator Guide 4 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 the setting of the calib

22、ration cycle and specification confidence level in a setup menu. Press P to clear the uncertainty display. 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 meter reading of exactly

23、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 adjustment rate, press . The

24、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 the lowest range that rea

25、ds 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 mode and determine the met

26、er 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. Exercise: Applying an ac Voltage There is no

27、“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 exactly 10V. To test the meters

28、 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 wait for the Calibrator output

29、 to settle (the “u” annunciator will go out). This ends the front panel exercise. To zero the output and go to standby, press r. Series II Multi-Function Calibrator Front Panel Features 5 Front Panel Features Following is a brief description of the Calibrators front panel features. Output Display (L

30、eft Side) Shows output amplitude 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: OPERATE

31、 Lit when an output is active at the binding posts or auxiliary amplifier. STANDBY Lit when the Calibrator is in standby. ADDR Lit when the Calibrator is addressed over the IEEE-488 interface. LCK Lit when the Calibrator output is phase locked to a signal at the rear panel PHASE LOCK connector. SHF

32、Lit when the Calibrator output has 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

33、 adjustments, softkey labels, and 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,

34、 you open up other menus, containing new softkey labels. 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 r

35、estore the display by pressing 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 m

36、essage is displayed. Front Panel 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. 5700A/5720A Operator Guide 6 The Calibrator automatically switches to

37、 standby mode when: r is pressed. the Calibrator is sourcing 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 s

38、witched from any ac or dc voltage to an ac or dc voltage less than 22V. 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 o

39、ff. Toggling X on (so it lights) 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

40、resistance function when the 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. x Opens and closes an internal connection between the V GUARD (voltage

41、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

42、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 Calibrator 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 connec