Fluke 26 Iii True Rms Multimeter User Manual
- Fluke 26 Iii True Rms Multimeter User Manual 98025
- Fluke 87 Iii True Rms Multimeter User Manual
- Fluke 26 Iii True Rms Multimeter User Manual 95652
- Fluke 79 Multimeter Manual
- Fluke 26 Iii True Rms Multimeter Manual
- True Rms Definition
View and Download Fluke 175 user manual online. True RMS Multimeters. 175 Multimeter pdf manual download. Also for: 177, 179. Multimeter Fluke 77 User Manual. Series ii multimeters (38 pages) Multimeter Fluke 87V Ex User Manual. True-rms multimeter (64 pages) Multimeter Fluke 21.
The Fluke 26-III and 79-III models are identical except for the model number. This model adds some extra features not available on the 77-III (and its identical twin the 23-III), like frequency and capacitance measurement, 4000 counts vs. 3200, RMS response, and a faster update speed. It also has a special 40-ohm resistance range that provides 10 milli-ohm resolution, aimed at electricians who may want to measure and compare contact resistances on relays and switches. It’s not a bad tool for the electronics workbench either, provided you do not need precise measurements of current in the micro-amp range. It does however have 1μA resolution in its lowest current range (4mA).
Fluke 26 Iii True Rms Multimeter User Manual 98025
This unit arrives in a completely non-functional state. It doesn’t look too bad on the outside, but attempting to power up with a fresh battery results in absolutely nothing on the display. Disassembly and a quick visual inspection, with particular attention to the battery connections, reveals no apparent damage to either the components or either side of the printed circuit board (PCB). Both fuses are blown, but that’s about par for the course with a used multimeter.
One thing of particular note about the construction of this model, is that the microprocessor at the top is completely covered with a grounded metal shield. It obscures the pins of the quad flat-pack (QFP) chip.
Fluke 10 Multimeter. Fluke 114, 115, 116, and 117. Fluke 114, 115, 117 True-rms Multimeters. Fluke 116 True-rms Multimeter. Fluke 116C True-rms Multimeter. Fluke 11/12 Multimeter. Fluke 110, 111, 112. Fluke 123 / 124. 125 Industrial Scopemeter. 1281 Selfcal Digital Multimeter. 12 Multimeter. 12B / 18 / 7 Multimeter. 79/26 English Instruction Sheet Page 1 ® 79/26 Series III Multimeter Instruction Sheet W Read First: Safety Information. Never use the meter if the meter or test leads look damaged. Be sure the test leads and switch are in the correct position for the desired measurement. Never measure resistance in a circuit when power is applied. Fluke 116 Multimeter Data Sheet Subject: Compact true-rms meter for HVAC troubleshooting The Fluke 116 was specifically designed for the HVAC professional. It has everything needed in an HVAC meter including temperature and microamp measurements to quickly troubleshoot problems with HVAC equipme nt and flame sensors. Created Date.
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Diagnosis begins by checking the current draw of the meter when powering from a DC power supply set to 8.5V. It measures 120μA, which is way lower than expected if this meter were actually running. When turned on, there appears to be a regulated 2.98V from the COM jack to the positive battery terminal. This means there’s at least one voltage regulator working in the power supply section (wherever that is, I’m working with no schematic here.) But there must be no load on the supply, as if something is disconnected.
Closer inspection reveals a possible problem up near the microprocessor and under the shield. The shield has to be removed for a better look. It appears we have a small area of major crud. This is isolated and a long way from the battery, so it would be hard to blame it on battery leakage. In any case it appears something corrosive has come into contact with the PCB in this area.
Time for scrubbing with a stiff brush and isopropyl alcohol (IPA). After the crud is removed, it becomes obvious that a copper pad near the microprocessor has eroded, leaving a trace broken and disconnected. The pins of the microprocessor appear to be OK, despite a little discoloration. There is a large 4-pin SMD component (clock crystal) in the area that will make repairs difficult, so it gets removed. More cleaning and examination shows that there is also another area of erosion on that same trace.
Repairs to the broken trace are made with 30ga wire-wrap wire, stripped of its kynar insulation and tinned. The 4-pin SMD crystal is re-soldered. Checking the supply current now shows a more healthy 1.05mA is being drawn. This is very promising.
The shield is re-soldered on, and the LCD re-installed. The meter boots up and displays all zeros on VDC! It measures resistance correctly, but checking with a 5.000V reference shows the calibration is off. There is a pretty good chance that I may have disturbed the calibration pot with my brush while I was doing the initial cleaning. Recommended calibration voltage is 3.5V, so a quick adjustment at that level restores calibration. After cleaning the plastic parts and giving the scratchy lens a polish, this meter is ready for service again.
DMMCheck calibration check results for this Fluke 26-III:
| Reference | Reading | Notes | |
| DC | 5V | 5.00 | |
| 1mA | 1.000 | ||
| AC | 5V | 5.03 | |
| 1mA | 1.003 | ||
| Ohms | 100Ω | 100.1 | 0.2 with leads shorted |
| 1K | 1.000 | ||
| 10K | 10.00 | ||
| 100K | 99.8 | ||
Page 29: Cat ii, Min max range hold h hz rel, 4 1/2 digits 1 seconds, True rms multimeter, Figure 6. testing a diode, Typical reading, Forward bias reverse bias
Making Measurements
21
Testing Diodes
Caution
To avoid possible damage to the meter or to
the equipment under test, disconnect circuit
power and discharge all high-voltage
capacitors before testing diodes.
Use the diode test to check diodes, transistors, silicon
controlled rectifiers (SCRs), and other semiconductor
devices. This function tests a semiconductor junction by
sending a current through the junction, then measuring
the junction’s voltage drop. A good silicon junction drops
between 0.5 V and 0.8 V.
To test a diode out of a circuit, set up the meter as shown
in Figure 6. For forward-bias readings on any
semiconductor component, place the red test lead on the
component’s positive terminal and place the black lead
on the component’s negative terminal.
In a circuit, a good diode should still produce a forward-
bias reading of 0.5 V to 0.8 V; however, the reverse-bias
reading can vary depending on the resistance of other
pathways between the probe tips.
MIN MAX
RANGE
HOLD
H
Hz
REL
mA
A
mV
V
V
OFF
!
!
A
COM
V
mA
µ
A
1000V MAX
400mA MAX
FUSED
10A MAX
FUSED
PEAK MIN MAX
µ
A
CAT II
+
Typical
Reading
MIN MAX
RANGE
HOLD
H
Hz
REL
mA
A
mV
V
V
OFF
!
!
A
COM
V
mA
µ
A
1000V MAX
400mA MAX
FUSED
10A MAX
FUSED
PEAK MIN MAX
µ
A
CAT II
Fluke 87 Iii True Rms Multimeter User Manual
+
Forward Bias
Reverse Bias
4 1/2 DIGITS
1 Seconds
87
TRUE RMS MULTIMETER
III
4 1/2 DIGITS
1 Seconds
87
TRUE RMS MULTIMETER
III
iy9f.eps
Fluke 26 Iii True Rms Multimeter User Manual 95652
Figure 6. Testing a Diode