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Fluke 117 — основы работы с цифровыми мультиметрами и их обслуживание [5/20]
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Digital Multimeters
Basic Maintenance
5
Function Range Resolution
Accuracy
± ([% of Reading] + [Counts])
Model
Hz (V or A input)
[2]
99.99 Hz
999.9 Hz
9.999 kHz
50.00 kHz
0.01 Hz
0.1 Hz
0.001 kHz
0.01 kHz
0.1 % + 2 115, 117
Notes:
[1] All ac ranges except Auto-V LoZ are specified from 1 % to 100 % of range. Auto-V LoZ is specified from 0.0 V. Because inputs below 1 % of range are
not specified, it is normal for this and other true-rms meters to display non-zero readings when the test leads are disconnected from a circuit or are
shorted together. For volts, crest factor of ≤3 at 4000 counts, decreasing linearly to 1.5 at full scale. For amps, crest factor of ≤3. AC volts is ac-
coupled. Auto-V LoZ, AC mV, and AC amps are dc-coupled.
[2] AC Volts Hz is ac-coupled and specified from 5 Hz to 50 kHz. AC Amps Hz is dc-coupled and specified from 45 Hz to 5 kHz.
[3] >10 A unspecified.
Table 3. Input Characteristics
Function Input Impedance (Nominal)
Common Mode Rejection Ratio
(1 kΩ Unbalanced)
Normal Mode Rejection
Volts AC >5 MΩ <100 pF >60 dB at dc, 50 or 60 Hz
Volts DC >10 MΩ <100 pF >100 dB at dc, 50 or 60 Hz >60 dB at 50 or 60 Hz
Auto-V LoZ ~3 kΩ <500 pF >60 dB at dc, 50 or 60 Hz
Open Circuit Test Voltage Full Scale Voltage Short Circuit Current
To 6.0 MΩ 40 MΩ
Ohms <2.7 V dc
<0.7 V dc <0.9 V dc
<350 μA
Diode Test <2.7 V dc 2.000 V dc <1.2 mA
Basic Maintenance
Testing the Fuse (115 & 117 only)
To test the fuse:
1. Set the rotary switch to
Ω.
2. Plug a test lead into the v jack and touch the probe to the 10A jack, as shown in Figure 1.
If the display shows a resistance value in the range of that shown in Figure 1, the fuse is good.
If the display reads 0L, replace the fuse and test again.
If the display shows any other value, have the Meter serviced. See “Contact Information” earlier in this document.
HOLD MIN MA X RANGE
10 A
FUSED
COM
V
A
Lo / H
OFF
Hz
Hz
AUTO-V
LoZ
Volt
Alert
A
A
V
V
mV
VoltA le rt
TRUE RMS MULTIMETER
117
<.5
OK
OK
erc010f.emf
Figure 1. Fuse Testing
Содержание
75- 115 116 and 117 calibration information
- Calibration information
- 115 116 and 117
- Contact information
- Introduction
- Digital multimeters
- Xw warnings and precautions
- Safety information
- Table 1 lists the international symbols that appear in this document and on the meter
- International electrical symbols
- General specifications
- Digital multimeters international electrical symbols
- Table 2 accuracy specifications
- 115 116 and 117 calibration information
- If the display shows any other value have the meter serviced see contact information earlier in this document
- If the display shows a resistance value in the range of that shown in figure 1 the fuse is good
- If the display reads 0l replace the fuse and test again
- Figure 1 fuse testing
- Digital multimeters basic maintenance
- Basic maintenance
- Testing the fuse 115 117 only to test the fuse
- Testing the fuse 115 117 only
- Table 3 input characteristics
- Set the rotary switch to
- Plug a test lead into the v jack and touch the probe to the 10a jack as shown in figure 1
- Xw warning
- Replacing the battery and fuse
- To avoid electric shock do not perform the performance test procedures unless the meter is fully assembled
- The following performance tests verify the complete operation of the meter and check the accuracy of each meter function against its specifications the recommended calibration interval is 12 months if the meter fails any part of the test calibration adjustment and or repair is indicated
- Required equipment table 4 lists the equipment required to conduct a performance test on the meter
- Required equipment
- Performance tests
- In the performance tests the meter is referred to as the unit under test uut
- Digital multimeters performance tests
- Cleaning the meter wipe the case with a damp cloth and mild detergent do not use abrasives or solvents dirt or moisture in the terminals can affect readings
- Cleaning the meter
- Xw warning
- Xw warning
- Testing the display
- Preparing for the performance tests
- Keypad test
- Backlight test
- Turn the rotary switch to the function listed in each step of table 5
- To verify the accuracy of the dmm functions do the following
- Testing temperature 116 only connect the k type thermocouple to the temperature input of the meter and temperature calibrator to ensure an accurate measurement the meter and the thermocouple connector must be at the same temperature after connecting the thermocouple to the meter allow the junctions to stabilize before recording the displayed reading this can take several minutes depending on temperature gradients
- Testing temperature 116 only
- If the display reading falls outside of the range shown in table 5 the meter requires calibration adjustment or repair
- Connect the calibrator to the v ω and com input terminals on the meter
- Compare the reading on the meter display with the display reading in table 5
- Check the fuses and battery and replace them if necessary refer to testing the fuses and replacing the battery and fuse
- Apply the input level for each step listed in table 5
- Allow the temperature of the uut to stabilize at room temperature 23 c 5 c 73 f 9 f
- Warm up the calibrator as required by its specifications
- Set calibrator to standby reconfigure leads and program for amps output
- 115 116 and 117 calibration information
- Testing the voltalert function 117 only
- Calibration adjustment password
- Calibration adjustment
- Changing the password
- Xw warning
- Restoring the default password
- Meter buttons used in the calibration steps
- Calibration adjustment procedure
- Notes set the calibrator to standby prior to changing the function switch position and after completing adjustment of each function
- If the calibration adjustment procedure is not properly completed the meter will not operate correctly
- Digital multimeters calibration adjustment
- 115 116 and 117 calibration information
- Digital multimeters replacement parts
- Table 7 lists the meter s replaceable parts identified in figure 6
- Replacement parts
- Figure 6 exploded view of meter
- 115 116 and 117 calibration information
- Warranty
- Digital multimeters warranty
- Battery primary mno2 zn 9v 505mah 6lr61 alkaline 17x26x48mm bulk
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Узнайте, как правильно использовать цифровые мультиметры, их функции и основные характеристики. Получите советы по обслуживанию и тестированию предохранителей.