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Fluke 789 [16/44] Check and replace fuses
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789/787B
Calibration Manual
12
Check and Replace Fuses
Warning
To prevent possible electrical shock, fire, or personal injury, use only
the specified replacement fuses.
Both current input jacks are fused with separate 440 mA fuses. To determine if a fuse is
blown:
1. Turn the rotary function switch to
W.
2. Plug the black test lead into COM, and the red test lead into the Ac input.
3. Using an ohmmeter, check the resistance between the ProcessMeter test leads. If
the resistance is about 1 Ω, the fuse is good. An open reading means that fuse F2 is
blown.
4. Move red test lead to .
5. Using an ohmmeter, check the resistance between the ProcessMeter test leads. If
the resistance is about 14 Ω, the fuse is good. An open means that fuse F1 is blown.
If a fuse is blown, replace it as follows. Refer to Figure 1 as necessary:
1. Remove the test leads from the ProcessMeter and turn the ProcessMeter OFF.
2. With a standard blade hand screwdriver, turn each battery compartment door screw
counterclockwise so that the slot is parallel with the screw picture molded into the
case.
3. Remove either fuse by gently prying one end loose, then sliding the fuse out of its
bracket.
4. Replace the blown fuse(s).
5. Replace the battery compartment door. Secure the door by turning the screws one-
quarter turn clockwise.
Performance Verification
Warning
To prevent electrical shock:
• Only qualified personnel should perform calibration verification
tests that use high voltages.
• Always place the calibrator in the Standby (STBY) mode between
tests and before handling the test connections or test cables.
Calibration verification tests confirm the complete functionality of the ProcessMeter and
check the accuracy of each ProcessMeter function against its specifications. If the
ProcessMeter fails any calibration verification test, it needs calibration adjustment or
repair.
The ProcessMeter’s performance and accuracy are specified for one year after
calibration at operating temperatures of +18 °C to +28 °C (64 °F to 82 °F), in relative
humidity to 90 %. The specifications assume the ProcessMeter has been warmed up for
5 minutes before use.
To perform the calibration verification tests, it is not necessary to open the case; no
adjustments are necessary. Merely make the required connections, source the
Содержание
- 787b calibration manual 1
- Calibration manual 1
- Processmeter 1
- Warranty 2
- Table of contents 3
- Title page 3
- How to contact fluke 5
- Introduction 5
- Safety information 6
- Ac volts measurement 9
- All specifications apply from 18 c to 28 c unless stated otherwise 9
- All specifications assume a 5 minute warm up period 9
- Counts refers to the number of increments or decrements of the least significant digit 9
- Dc millivolts measurement 9
- Dc volts measurement 9
- Processmeter 9
- Specifications 9
- The standard specification interval is 1 year 9
- Ac current measurement 10
- Dc current measurement 10
- Frequency counter accuracy 10
- Ohms measurement 10
- Approximate trigger level 5 of full scale 11
- Frequency counter sensitivity 11
- Hz to 5 khz 11
- Input range 11
- Minimum sensitivity rms sinewave 11
- Mv 150 mv 50 hz to 5 khz 150 mv 11
- Processmeter 11
- Specifications 11
- Usable 0 hz to 20 khz with reduced sensitivity 1 11
- V 1 v 1 v 11
- V 4 v 4 v 11
- V 40 v 40 v 11
- V 400 v 400 v 11
- Vhz max 11
- Calibration manual 12
- General specifications 12
- Equipment and software required to perform the procedures in this manual are identified in table 2 13
- If the recommended equipment model is not available in some cases other equipment can be substituted as long as it meets the specifications indicated 13
- If you are using a different calibrator or dmm make the connections appropriate for that instrument 13
- Processmeter 13
- Required equipment 13
- To avoid safety hazards and equipment damage during the calibration procedure use the specified calibration equipment listed in table 2 using unspecified equipment can jeopardize the calibration verification test and pose safety hazards 13
- Unless otherwise indicated all connection diagrams for the calibration verification tests in this manual showing a calibrator or digital multimeter use a fluke 5522a calibrator fluke 8508a reference multimeter keysight 3458a dmm or equivalent 13
- Warning 13
- Basic maintenance 14
- Battery replacement 14
- How to clean 14
- Battery life 15
- Check and replace fuses 16
- Performance verification 16
- Preparation 17
- Loop power test 789 only 18
- Current sourcing test 19
- Position 19
- Current measurement test 20
- Apply 2 v dc from the calibrator 21
- Connect the calibrator to the com and 21
- Connect the current terminals of the multimeter to the com and 21
- Diode function test 21
- Figure 5 21
- Performance verification 21
- Position 21
- Press j blue to select diode test 21
- Processmeter 21
- Put the calibrator in standby stby mode 21
- Put the calibrator in standby stby mode then disconnect the calibrator from the 21
- Put the multimeter in the dc ma autorange function 21
- Terminals on the 21
- Terminals on the uut as shown in 21
- The multimeter should read close to 0 ma there is no tolerance specification for this current this test just makes sure that the diode test current source is operating 21
- The uut should read between 1 59 v and 2 41 v 21
- Turn the uut rotary switch in the 21
- Adm007f eps 22
- Calibration manual 22
- Figure 5 diode test connections 22
- Continuity function test 23
- Resistance measurement test 24
- Performance verification 25
- Processmeter 25
- Apply the values from the calibrator shown in table 9 and compare the readings on 26
- Connect the calibrator to the com and 26
- Dc millivolts measurement test 26
- Figure 8 26
- Position 26
- Put the calibrator in standby stby mode 26
- Put the uut rotary switch in the 26
- Terminals on the uut as shown in 26
- The uut to the acceptable readings shown 26
- Dc volts measurement tests 27
- Ac volts measurement test 28
- Always place the calibrator in the standby stby mode between tests and before handling the test connections or test cables 28
- Apply the values from the calibrator shown in table 11 and compare the readings on 28
- Connect the calibrator to the com and 28
- Figure 9 28
- Put the calibrator in standby stby mode 28
- Put the uut rotary switch in the s position 28
- Some of the calibration verification tests involve the use of high voltages and should be performed by qualified personnel only 28
- Terminals on the uut as shown in 28
- The uut to the acceptable readings shown 28
- To prevent possible electrical shock fire or personal injury 28
- Warning 28
- Frequency measurement test 29
- Calibration adjustment 30
- Preparation 30
- Ac voltage adjustment 31
- Procedure for models with firmware version 2 31
- Frequency adjustment 32
- Dc millivolts adjustment 33
- Dc voltage adjustment 33
- Diode adjustment 34
- Ohms adjustment 34
- Amps dc adjustment 35
- Milliamps dc adjustment 35
- Amps ac adjustment 36
- Milliamps output adjustment 36
- Calibration adjustment counter 37
- Calibration adjustment password 37
- How to change the password 37
- Procedure for models with firmware version 2 37
- Static awarenes 38
- Apply 6 v across the battery pads xbt1 and on the back of the pca see 39
- Beep if the beeper is enabled the default password is now restored 39
- C62 c69 39
- C66 c86 39
- Calibration adjustment 39
- Figure 10 39
- Figure 12 restoring the default password 39
- Firmware version 2 39
- How to restore the default password 39
- If the calibration password is forgotten the default password can be restored with these steps 39
- Processmeter 39
- R104 r107 c95 39
- R105 r116 39
- R110 c98 39
- R87 r90 39
- Remove the 6 v supply and install the shield and back case on the uut 39
- Remove the back case from the uut 39
- Remove the shield and leave the pca in the top case 39
- Short across the keypad on the back of the pca see figure 10 the uut should 39
- To avoid electrical shock or personal injury remove the test leads and any input signal before removing the back case from the uut 39
- Tp14 tp17 39
- Tp26 c64 39
- Turn the rotary switch from off to b 39
- Warning 39
- Calibration adjustment 40
- Meter keys used in the calibration steps 40
- Calibration adjustment 41
- Caution 41
- Processmeter 41
- Remove 1 a from uut promptly after storing calibration constant fuse will blow after 30 seconds 41
- Set the calibrator to standby prior to changing the function switch position and or after completing adjustment of each function if the calibration adjustment procedure is not completed correctly the uut will not operate correctly 41
- Calibration manual 42
- Figure 13 replacement parts 42
- Replacement parts and accessories 42
- Replacement parts and some accessories are shown in figure 13 and listed in table 14 many more dmm accessories are available from fluke for a catalog contact the nearest fluke distributor 42
- To find out how to order parts or accessories use the telephone numbers or addresses shown in contacting fluke 42
- To prevent possible electrical shock fire or personal injury use only 42
- Use only specified replacement fuses 42
- Use only specified replacement parts 42
- Warning 42
- Processmeter 43
- Replacement parts and accessories 43
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