FLUKE 187_189 电路图.pdf

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1、 Model 187 all previously activated button features (HOLD, Hz, etc.) are discarded. The automatic power off is preset to 15 minutes. From the Setup menu (see Chapter 5), you can specify a maximum period of 23 hours, 59 minutes. If you set the period to 0, the meter remains on until you turn the rota

2、ry switch to OFF or the batteries become too weak. Automatic power off does not occur if the meter is in MIN MAX, FAST MN MX, AutoHOLD, or LOGGING (Model 189) mode. Getting Acquainted Battery Considerations2 2-3 Automatic Backlight Off Press ? to select the backlight level (low, high, or off.) In lo

3、w or high, the backlight turns off automatically after a given period. This period is also preset to 15 minutes and can be set to a maximum of 99 minutes from the setup menu. If the period is set to 0, the backlight is on indefinitely and can only be turned off by pressing ? or turning the meter off

4、. Note See Chapter 5 for power off and backlight off setup information. Low Battery Indication A constant battery icon ( ?) in the upper left corner of the display notifies you that the batteries are low and should be replaced. ?Warning To avoid false readings, which could lead to possible electric

5、shock or personal injury, replace the batteries as soon as the battery icon ( ?) appears. A flashing battery icon means that battery failure is imminent. The backlight cannot be used in this condition. MIN MAX and FAST MN MX features turn off. For Model 189, logging and communications also cease. Mo

6、del 187 refer to Chapter 4 for more information. The rotary switch is shown in Figure 2-2. Each position is described in Table 2-1. dB dB ac+dc ac+dc ac+dc ac+dc F nS CLEAR MEM V mA A mV V mV OFF VIEW MEM C A A mA A tc012f.eps Figure 2-2. Rotary Switch Getting Acquainted Pushbuttons2 2-5 Pushbuttons

7、 The buttons activate features that augment the function selected with the rotary switch. The buttons are shown in Figure 2-3 and described in Table 2-2. Use the blue button ( ?) to access functions labeled in blue for some of the rotary switch positions. Table 2-1 defines all blue button functions.

8、 Use the yellow button ( ?) followed by other buttons to access additional features. These features appear in yellow above the appropriate keys. Table 2-2 defines yellow button features. This manual identifies the yellow button feature in parentheses following the button sequence . For example, acti

9、vating the FAST MN MX mode appears as ? ? (FAST MN MX). MIN MAXHOLDREL %msHzRANGE MIN MAXHOLDREL %msHzRANGE AutoHOLDLOGGING SAVECANCEL FAST MN MX SETUP YES NO tc013f.eps Figure 2-3. Pushbuttons The following yellow button features are not available on Model 187: (YES), (NO), (LOGGING), and (SAVE). M

10、odel 187 the last stable reading is displayed. ?Press to start retaining min, max, and average values. Press successively to display max, min, and average values. Press ? ? (CANCEL) to stop. FAST MN MX ? ? Press to start FAST MN MX mode, where min and max values for short duration events are stored.

11、 ?Press to store the present reading as an offset reference; subsequent readings show only the relative difference from this value. Press again to show the difference as a percentage of the reference. LOGGING ? ? Press to start and stop Logging (Model 189). Press ? + ? (CANCEL) to stop. Getting Acqu

12、ainted Pushbuttons2 2-9 Table 2-2. Pushbuttons (cont.) ButtonDescription Yellow Button FunctionDescription ? ? In Setup, increment a digit . In counter functions, select positive pulse slope. In ohms continuity, select beep on open. In VIEW MEM, see Chapter 4 (Model 189). (none) ? ? In Setup, decrem

13、ent a digit . In counter functions, select negative pulse slope. In ohms continuity, select beep on short. In VIEW MEM, see Chapter 4 (Model 189). (none) ?Exit AUTO and enter MANUAL ranging. In MANUAL, select next input range. Press ? ? (CANCEL) to return to AUTO. SAVE ? ? Press to save present read

14、ing (Model 189) ?Successively press for frequency, duty cycle, and pulse width. CANCEL ? ? CANCEL any ? (blue key) function and all other button features. ? ? The blue button. Press to access blue functions on the rotary switch. In Setup, use arrow function ( ?) to select the next digit or item in a

15、 list. (none) Model 187 only 3-1/2 display digits are allowed. Activate FAST MN MX by pressing ? ?. As with regular MIN MAX, you can then press ? to cycle through maximum, minimum, and average primary displays. The meter beeps for any new minimum or maximum value. Exit FAST MN MX by pressing ? (CANC

16、EL) or by turning the rotary switch. A low battery condition (flashing ?) disables FAST MN MX. In ac measurement functions, MAX and MIN values are peak values, AVG is the rms value. This provides the necessary information in one display for calculation of Crest Factor (peak/rms). Due to longer requi

17、red response times, you cannot use FAST MN MX in the following functions: ohms, diode test, conductance, continuity, capacitance, temperature, ac over dc, ac+dc, Hz, duty cycle, and pulse width. tc033f.eps Figure 2-7. Min Max Avg Model 187 blue letters or symbols identify alternative functions. Pres

18、s the blue button to access these alternate functions. Frequency-related functions can be selected (Hz, duty cycle, and pulse width) when the rotary switch is in any volts or amps position. Measuring Voltage Voltage is the difference in electrical potential between two points. The polarity of ac (al

19、ternating current) voltage varies over time, while the polarity of dc (direct current) voltage is constant over time. Ranges available in volts functions are: ? ? 5.0000 V, 50.000 V, 500.00 V, 1000.0 V ? 50.000 mV, 500.00 mV, and 5000.0 mV Readings in the 5000.0 mV range overload (?) near 3000 mV ac

20、 or dc. The 5000.0 mV range overlaps the 5.0000 V range to provide direct reading display for Fluke accessories that have a millivolt output with limits scaled by 1000. For example, the Fluke 80i-1000 Current Clamp provides 1 mV ac per amp measured up to 1000 amps. Model 187 autoranging is not avail

21、able. Refer to Figure 3-6 for continuity testing setup instructions. Making Measurements Using Conductance for High Resistance Tests3 3-9 Continuity testing provides you with both a visual indication of the state encountered (usually near 0 resistance for a short or OL for an open) and an audible be

22、ep when the input is low. In continuity, a short means a measured value less than 5% of full scale. You can raise this threshold by manually selecting a higher range. You can select whether the beeper comes on for open or short conditions, as follows: Press ? to enable the beeper for opens. Press ?

23、to enable the beeper for shorts. The Hz ( ?) and FAST MN MX ( ? ?) functions are not available when continuity is selected. All other pushbutton functions are available. The blue key cycles among resistance, continuity, and conductance. Using Conductance for High Resistance Tests Conductance, the in

24、verse of resistance, is the ability of a circuit to pass current. High values of conductance correspond to low values of resistance. The unit of conductance is the Siemens (S). The meters 50 nS range measures conductance in nanosiemens (1 nS = 0.000000001 Siemens). Because such small amounts of cond

25、uctance correspond to extremely high resistance, the nS range lets you determine the resistance of components up to 100,000 M, or 100,000,000,000 (1 nS = 1,000 M). To measure conductance, set up the meter as shown in Figure 3-7; then press the blue key until the nS indicator appears on the display.

26、With conductance measurements, the following pushbutton operations cannot be used: Frequency ( ?) FAST MN MX ( ? ?) Manual ranging ( ?) Model 187 press ? until AVG appears in the display. There is normally a residual conductance reading with the test leads open. To ensure accurate readings, press ?

27、with the test leads open to subtract the residual value. Model 187 however, the reverse-bias reading can vary depending on the resistance of other pathways between the probe tips. The blue key toggles between diode test and capacitance. Since diode test uses a fixed range, ? cannot be used. Model 18

28、7 touch the black probe to the more negative side of the break. Reversing the leads will produce a negative reading, but will not damage the meter. 5. Turn on power to the circuit; then read the display. Be sure to note the unit given at the right side of the display (A, mA, or A). 6. Turn off power

29、 to the circuit and discharge all high- voltage capacitors. Remove the meter and restore the circuit to normal operation. Input Alert Feature If a test lead is plugged into the mA/A or A terminal, but the rotary switch is not correctly set to one of the current measuring positions, the beeper warns

30、you by making a chirping sound and the display shows $ then press ? a second time. You can select the level the meter uses by pressing ? to trigger on the positive slope or ? to trigger on the negative slope. A typical duty cycle display is shown in Figure 3-16. tc027f.eps Figure 3-16. Duty Cycle Di

31、splay For 5 V logic signals, use the 5 V dc range. For 12 V switching signals in automobiles, use the 50 V dc range. For sine waves, use the lowest ac or dc range that does not result in multiple triggering. A manually-selected lower input range will often measure better than the AUTO- selected inpu

32、t range. If a duty cycle reading is unstable, press ? until the AVG annunciator comes on and the average reading appears in the secondary display. Measuring Pulse Width The pulse width function allows you to measure the amount of time a signal is high or low within a given period. See Figure 3-17. T

33、he measured waveform must be periodic; its pattern must repeat at equal time intervals. Model 187 then press ? two more times. As with the duty cycle function, you can select which level the meter uses by pressing ? to trigger on the positive slope or ? to trigger on the negative slope. A typical pu

34、lse width display is shown in Figure 3-18. You can improve pulse width stability by selecting the averaging feature. Press ? until “AVG” appears in the display. tc028f.eps Figure 3-18. Pulse Width Display Model 187 #Line/Main frequency# or *# (flashing) - Use ? ? to select. and V inputs on the meter

35、. 3. Place the temperature probe and an accurate thermometer in a lag bath (i.e., a container with an isothermal liquid). 4. Press ? ? to enter the Setup mode and temperature adjust. The primary display shows the measured value for the temperature probe. This value is already adjusted by any previou

36、sly stored offset (shown in the secondary display.) See Figure 5-1. Changing the Default Settings Adjusting the Temperature Offset5 5-5 If necessary, adjust the temperature offset until the temperature on the primary display matches the temperature indicated by the lag bath thermometer. 1. Press ? (

37、 ?) to advance to the next digit and press ? (?) to go back to the previous digit. 2. Press ? or ? to increase or decrease the digit value. 3. Save changes by pressing ? ?. 4. Press ? ? to exit Setup. tc041f.eps Figure 5-1. Adjusting Temperature Offset Model 187 the minute digits begin flashing. 4.

38、Press ? or ? to increase or decrease the minute value. 5. Press ? ? to store the selection and proceed to the next selection. Setting the Line (Main) Frequency Although the meter operates on battery power only, it is important to specify the frequency (50 or 60 Hz) of the line (main) power. This all

39、ows the meter to filter out related noise. To change the line (main) frequency: 1. Press ? ? until *#;# appears in the display. 2. Press ? or ? to change the selection to the correct frequency. 3. Press ? ? to store the selection and proceed to the next selection. Model 187 press ? to select 8. If y

40、ou select 7 you cannot specify individual choices. 3. Press ? ? to exit the setup procedure and activate your selection. If you selected 7 French, German, Italian, Dutch=1555282; Danish, Finnish, Norwegian, Swedish=1555307; French, Spanish, Portuguese=1555294; Simplified Chinese, Traditional Chinese

41、, Korean, Japanese,Thai=1555282 7-1 Chapter 7 Specifications Safety and Compliances Maximum voltage between any terminal and earth ground. 1000 V dc or rms ac Compliances - DUAL RATINGSComplies with IEC 1010-1 to 1000 V Overvoltage Category III, Pollution Degree 2; and IEC 664-1 to 600 V Overvoltage

42、 Category IV, Pollution Degree 2 * Certifications (Iisted and pending)CSA per standard CSA/CAN C22.2 No. 1010.1-92 UL per standard UL 3111 TV per standard EN 61010 Part 1-1993 Surge Protection8 kV peak per IEC 1010.1-92 ?Fuse Protection for mA or A inputs ?Fuse Protection for A input 0.44 A (44/100

43、A, 440 mA), 1000 V FAST Fuse 11 A, 1000 V FAST Fuse Markings ?, ?,UL, TV and ? * OVERVOLTAGE (Installation) Categories refer to the level of Impulse Withstand Voltage protection provided at the specified Pollution Degree. Overvoltage Category III equipment is equipment in fixed installations. Exampl

44、es include switch gear and polyphase motors. Overvoltage Category IV equipment is equipment for use at the origin of the installation. Examples include electricity meter and primary over-current protection equipment. Model 187 updates 4/second. Analog: 51 segments, updates 40/second. Operating Tempe

45、rature 20 C to + 55 C Storage Temperature 40 C to + 60 C Temperature Coefficient0.05 x (specified accuracy) / C (28 C) Relative Humidity0 % to 90 % (0 C to 35 C) 0 % to 70 % (35 C to 55 C) AltitudeOperating: 0-2000 meters per EN61010 CAT III, 1000 V; CAT IV, 600 V 0-3000 meters per EN61010 CAT II, 1

46、000 V; EN61010 CAT III, 600 V; CAT IV, 300 V Storage: 10000 meters Battery Type4 AA Alkaline, NEDA 15A or LR6 Battery Life72 Hours typical (with backlight off) Shock VibrationPer MIL-T-PRF 28800 for Class II instruments Electromagnetic Compatibility (EMC) Susceptibility and Emissions: Commercial Lim

47、its per EN61326-1 Size10.0 cm x 20.3 cm x 5.0 cm (3.94 in x 8.00 in x 1.97 in) (Not Including Accessory Mount) Weight545 grams (1.2 lbs.) WarrantyLifetime Calibration Interval1 year Specifications Feature Summary7 7-3 Feature Summary FeatureDescription Dual Digital Displays Analog Bar Graph Primary:

48、 50,000 counts Secondary: 5,000 count Bar graph: 51 segments, updates 40 times/second Backlight with 2 brightness levelsBright white backlight for clear readings in poorly lighted areas Fast AutorangeMeter automatically selects best range - instantly AC+DC true rms, ac rms specified to 100 kHzChoice

49、s for AC only, AC and DC dual display, or AC+DC readings dBm, dBVUser selectable impedance references for dBm AutoHOLDHolds readings on display Continuity / Open testBeeper sounds for resistance readings below threshold, or to indicate a momentary open circuit Fast Bar Graph51 segments for peaking and nulling Duty cycle / Pulse widthMeasure signal on or off time in % or milliseconds MIN MAX Mode FAST MN MX with 24-hour time stamp Record maximum, minimum, and average values. 24-hour clock for MAX or M