FLUKE-27YEL Fluke Electronics, FLUKE-27YEL Datasheet - Page 14

• Manufacturer Part Number: FLUKE-27YEL
• Description: MULTIMETER YELLOW COLOR
• Manufacturer: Fluke Electronics
• Series: TouchHold®, 20r
• Type: Digital (DMM)r

Specifications of FLUKE-27YEL

• Includes: Battery, Clips, Test Leads
• Style: Handheld
• Display Digits: 3.75
• Display Type: LCD, Bar Graph
• Display Count: 3200
• Function: Voltage, Current, Resistance
• Functions, Extra: Continuity, Diode Test
• Features: Hold, MIN/MAX
• Ranging: Auto/Manual
• Response: Average
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 739169

27
Users Manual
Resistance and Diode Test/Continuity
Resistance Measurement
Test lead resistance may influence measurement
accuracy on the 320-ohm range. To determine the error,
short the test leads together and read the lead
resistance. Correct the measurement by subtracting the
lead resistance from the measurement, or use the
Relative (REL) mode to zero the display. The error is
usually 0.1 to 0.2 ohms for a standard pair of test leads.
Some in-circuit resistance measurements can be made
without removing diodes and transistors from the circuit.
The full-scale measurement voltage produced on ranges
below 32 megohms does not strongly forward bias silicon
diodes or transistor junctions. Use the highest range you
can (except 32 megohm) to minimize the possibility of
turning on diodes or transistor junctions. Full scale
measurement voltage in the 32-megohm range does
strongly forward bias a diode or transistor.
10
To avoid possible damage to the meter or to
the equipment under test, disconnect circuit
power and discharge all high voltage
capacitors before measuring resistance,
testing for continuity, or diode test.
Caution
Diode Test and Continuity
In diode test, there is only one range: 0 to +2.08 volts.
Voltage is developed across the component(s) under test
by a test current output from the Fluke 27. Voltages
greater than 2.08 V or open test leads produce an
overload (OL) condition. Negative inputs produce a
negative indication (they are not suppressed). In the
diode test function S the beeper produces a
continuous tone if the input is less than 0.1 V, and the
beeper beeps once when the input descends through a
0.7 V threshold.
Audible continuity testing is also performed with the
function selector switch in the diode test/continuity
position. A continuous tone sounds for test resistances
below approximately 270 ohms. An intermittent
connection produces erratic beeps, and can be valuable
troubleshooting aid. Erratic beeps can also occur, due to
environmental noise, if a test value is very close to the
threshold (270 ohms). Test resistances from
approximately 270 ohms to 2600 ohms produce a short
tone similar to a forward biased diode. Test resistances
less than approximately 36 kilohms will produce an on-
scale reading.