Fluke 27-II Use and care manual

April 2010
© 2010 Fluke Corporation. All rights reserved. Specifications are subject to change without notice.
All product names are trademarks of their respective companies. 1
27 II/28 II
Digital Multimeters
Calibration Information
Introduction
XWWarning
To avoid electric shock or injury, do not perform the
performance tests or calibration adjustment procedures unless
qualified to do so.
The information provided in this document is for the use of
qualified personnel only.
The 27 II/28 II Calibration Information provides adjustment and performance test
procedures for the Fluke Model 27 II and 28 II Digital Multimeters (hereafter known as
the Meter).
This document includes the following information:
•Safety Information and International Electrical Symbols (page 2)
•Specifications (page 5)
•Testing the Fuse (page 9)
•Cleaning (page 9)
•Performance Tests (page 11)
•Calibration Adjustment (page 19)
•Replacement Parts (page 24)
•Complete Warranty (page 27)
See the 27 II/28 II Users Manual for complete operating instructions.
Contact Information
To contact Fluke, call one of the following telephone numbers:
USA: 1-888-99-FLUKE (1-888-993-5853)
Canada: 1-800-36-FLUKE (1-800-363-5853)
Europe: [phone]
Japan: [phone]
Singapore: [phone]
Anywhere in the world: [phone]
Or, visit Fluke's Web site at www.fluke.com.
To register your product, visit register.fluke.com

27 II/28 II
Calibration Information
2
Safety Information
"Warning" and "Caution" Statements
A Warning identifies hazardous conditions and actions that could cause bodily harm or
death.
A Caution identifies conditions and actions that could damage the Meter, the equipment
under test, or cause permanent loss of data.
XWWarning
To prevent possible electrical shock or personal injury, follow
these guidelines:
•Use this Meter only as specified in this manual or the
protection provided by the Meter might be impaired.
•Do not use the Meter if it is damaged. Before you use the
Meter, inspect the case. Look for cracks or missing plastic.
Pay particular attention to the insulation surrounding the
connectors.
•Make sure the battery door is closed and secured before
operating the Meter.
•Replace the battery as soon as the battery indicator ()
appears.
•Remove test leads from the Meter before opening the
battery door.
•Inspect the test leads for damaged insulation or exposed
metal. Check the test leads for continuity. Replace
damaged test leads before you use the Meter.
•Do not apply more than the rated voltage, as marked on the
Meter, between the terminals or between any terminal and
earth ground.
•Never operate the Meter with the cover removed or the
case open.
•Use caution when working with voltages above 30 V ac
rms, 42 V ac peak, or 60 V dc. These voltages pose a shock
hazard.
•Use only the replacement fuses specified by the manual.
•Use the proper terminals, function, and range for
measurements.
•Avoid working alone.
•When measuring current, turn off circuit power before
connecting the Meter in the circuit. Remember to place the
Meter in series with the circuit.

Digital Multimeters
Safety Information
3
•When making electrical connections, connect the common
test lead before connecting the live test lead; when
disconnecting, disconnect the live test lead before
disconnecting the common test lead.
•Do not use the Meter if it operates abnormally. Protection
may be impaired. When in doubt, have the Meter serviced.
•Do not use the Meter around explosive gas, vapor or in
damp or wet environments.
•Use only three 1.5-V AA batteries, properly installed in the
Meter case, to power the Meter.
•When servicing the Meter, use only specified replacement
parts.
•When using probes, keep fingers behind the finger guards
on the probes.
•Do not use the Low-Pass Filter to verify the presence of
hazardous voltages. Voltages greater than what is
indicated may be present. First, make a voltage
measurement without the filter to detect the possible
presence of hazardous voltage. Then add the filter.
WCaution
To avoid possible damage to the Meter or to the equipment
under test, follow these guidelines:
•Disconnect circuit power and discharge all high-voltage
capacitors before testing resistance, continuity, diodes, or
capacitance.
•Use the proper terminals, function, and range for all
measurements.
•Before measuring current, check the Meter’s fuses. (See
“Fuse Test”.)

27 II/28 II
Calibration Information
4
Electrical Symbols
Table 1 lists the electrical symbols that appear in this document and on the Meter
Table 1. Symbols
BAC (Alternating Current) JEarth ground
FDC (Direct Current) IFuse
XHazardous voltage PConforms to European Union directives.
WRisk of Danger. Important
information. See Manual. )Conforms to relevant Canadian Standards Association directives.
Battery. Low battery when
displayed. TDouble insulated
RContinuity test or continuity
beeper tone. ECapacitance
CAT III
IEC Overvoltage Category III
CAT III equipment is designed to
protect against transients in
equipment in fixed-equipment
installations, such as distribution
panels, feeders and short
branch circuits, and lighting
systems in large buildings.
CAT IV
IEC Overvoltage Category IV
CAT IV equipment is designed to protect
against transients from the primary supply
level, such as an electricity meter or an
overhead or underground utility service.
~
Do not dispose of this product
as unsorted municipal waste. Go
to Fluke’s website for recycling
information.
Diode
®Inspected and licensed by TÜV
Product Services. ;Conforms to relevant Australian standards.

Digital Multimeters
General Specifications
5
General Specifications
Maximum voltage between any
terminal and earth ground ........................................... 1000 V rms
WFuse for mA inputs .................................................. 440 mA, 1000 V FAST Fuse
WFuse for A inputs ..................................................... 11 A, 1000 V FAST Fuse
Display
Digital.......................................................................... 6000 counts, updates 4/sec (Model 28 II also has 19,999 counts
in high-resolution mode).
Bargraph..................................................................... 33 segments; updates 40/sec
Altitude
Operating.................................................................... 2,000 meters
Storage ....................................................................... 10,000 meters
Temperature
Operating.................................................................... -15 °C to +55 °C, to -40 °C for 20 minutes when taken from 20 °C
Storage ....................................................................... -55 °C to +85 °C (without battery)
-55 °C to +60 °C (with battery)
Temperature coefficient
28 II............................................................................. 0.05 X (specified accuracy) / °C (< 18 °C or > 28 °C)
27 II............................................................................. 0.1 X (specified accuracy) / °C (< 18 °C or > 28 °C)
Electromagnetic Compatibility (EN 61326-1:1997) .... In an RF field of 3 V/M, accuracy = specified accuracy +20
counts, except 600 μA dc range total accuracy = specified
accuracy +60 counts. Temperature not specified
Relative Humidity.......................................................... 0 % to 95 % (0 °C to 35 °C)
0 % to 70 % (35 °C to 55 °C)
Battery Type .................................................................. 3 AA Alkaline batteries, NEDA 15A IEC LR6
Battery Life .................................................................... 800 hrs typical without backlight (Alkaline)
Vibration ........................................................................ Per MIL-PRF-28800 for a Class 2 instrument
Shock ............................................................................. 1 Meter drop per IEC 61010 (3 Meter drop with holster)
Size (H x W x L) ............................................................. 1.80 in x 3.95 in x 8.40 in (4.57 cm x 10.0 cm x 21.33 cm)
Size with Holster ........................................................... 2.50 in x 3.95 in x 7.80 in (6.35 cm x 10.0 cm x 19.81 cm)
Weight ............................................................................ 1.14 lb (517.1 g)
Weight with Holster and Flex-Stand............................ 1.54 lb (698.5 g)
Safety Compliance........................................................ Complies with ANSI/ISA S82.01-2004, CAN/CSA C22.2 61010-1-
04 to 600 V Measurement Category IV. Licensed by TÜV to
EN61010-1
Certifications ................................................................. CSA, TÜV, P, ;(N10140), GOST
IP Rating ........................................................................ 67 (Protected against dust and the effect of immersion between
15 cm and 1 m for 30 min)
Detailed Specifications
For all detailed specifications:
Accuracy is specified for 2 years after calibration, at operating temperatures of 18 °C to 28 °C, with relative humidity at 0
% to 95 %. Accuracy specifications take the form of ±([% of Reading] + [Number of least-significant digits]). For Model
28 II in the 4 ½-digit mode, multiply the number of least-significant digits (counts) by 10.
27 II AC Voltage
Accuracy [2]
Range Resolution
40 Hz – 2 kHz 2 kHz – 10 kHz 10 kHz – 30 kHz
600.0 mV 0.1 mV
6.000 V 0.001 V
60.00 V 0.01 V
±(4 % + 10)
600.0 V 0.1 V
±(0.5 % + 3) ±(2 % + 3)
±(4 % + 10) [1]
1000 V 1 V ±(1.0 % + 3) ±(3 % + 3) Unspecified
[1] Specified to a maximum of 300 V ac
[2] Below 5 % of range, temperature coefficient is 0.15 X (specified accuracy)/ °C (>40 °C).

27 II/28 II
Calibration Information
6
28 II AC Voltage
AC conversions are ac-coupled and valid from 3 % to 100 % of range.
Accuracy
Range Resolution
45 – 65 Hz 15 – 200 Hz 200 – 440 Hz 440 Hz – 1 kHz 1 – 5 kHz 5 – 20 kHz
600.0 mV 0.1 mV
6.000 V 0.001 V ±(0.7 % + 4) ±(2 % + 4) ±(2 % + 20) [2]
60.00 V 0.01 V Unspecified
600.0 V 0.1 V ±(2 % + 4) [3] Unspecified
1000 V 1 V
±(1.0 % + 4) [1]
Unspecified Unspecified
Low-Pass Filter
±(0.7 % + 2)
±(1.0 % + 4) [1] +1.0 % + 4
-6.0 % - 4 [4] Unspecified Unspecified Unspecified
[1] Below 30 Hz, use smoothing function.
[2] Below 10 % of range, add 12 counts.
[3] Frequency range: 1 to 2.5 kHz
[4] Specification increases from -1 % to -6 % at 440 Hz when filter is used.
DC Voltage, Conductance, and Resistance
Function Range Resolution Accuracy
mV dc 600.0 mV 0.1 mV ±(0.1 % + 1)
6.000 V 0.001 V
60.00 V 0.01 V
600.0 V 0.1 V
V dc
1000 V 1 V
±(0.05 % + 1)
600.0 Ω0.1 Ω±(0.2 % + 2) [2]
6.000 kΩ0.001 kΩ
60.00 kΩ0.01 kΩ
600.0 kΩ0.1 kΩ
6.000 MΩ0.001 MΩ
±(0.2 % + 1)
Ω
50.00 MΩ0.01 MΩ±(1.0 % + 1) [1]
nS 60.00 nS 0.01 nS ±(1.0 % + 10) [1,2]
[1] Add 0.5 % of reading when measuring above 30 MΩin the 50 MΩrange, and 20 counts below 33 nS in the 60 nS range.
[2] When using the rel function to compensate for offsets.
Temperature (28 II Only)
Range Resolution
Accuracy [1, 2]
-200 °C to +1090 °C
-328 °F to +1994 °F
0.1 °C
0.1 °F
±(1.0 % + 10)
±(1.0 % + 18)
[1] Does not include error of the thermocouple probe.
[2] Accuracy specification assumes ambient temperature stable to ±1 °C. For ambient temperature changes of ±5 °C, rated accuracy
applies after 2 hour.

Digital Multimeters
Detailed Specifications
7
AC Current
Accuracy
Function Range Resolution Burden Voltage
27 II [1, 2]
(40 Hz – 1 kHz)
28 II [3]
(45 Hz – 2 kHz)
600.0 μA 0.1 μA 100 μV/μA
μA ac 6000 μA 1 μA 100 μV/μA
60.00 mA 0.01 mA 1.8 mV/mA
mA ac 400.0 mA [4] 0.1 mA 1.8 mV/mA
6.000 A 0.001 A 0.03 V/A
A ac 10.00 A [5,6] 0.01 A 0.03 V/A
±(1.5 % + 2) ±(1.0 % + 2)
[1] AC conversion for the 27 II is ac coupled and calibrated to the rms value of a sine wave input.
[2] Below 300 counts, add 1 count and the temperature coefficient is 0.15 x (specified accuracy) / °C (>40 °C).
[3] AC conversions for the 28 II are ac coupled, true rms responding, and valid from 3 % to 100 % of range, except 400 mA range. (5 %
to 100 % of range) and 10 A range (15 % to 100 % or range).
[4] 400 mA continuous. 600 mA for 18 hr maximum.
[5] W10 A continuous up to 35 °C. < 20 minutes on, 5 minutes off at 35 °C to 55 °C. >10 A to 20 A for 30 seconds maximum, 5 minutes
off.
[6] >10 A accuracy unspecified.
DC Current
Accuracy
Function Range Resolution Burden Voltage 27 II 28 II
600.0 μA 0.1 μA 100 μV/μA ±(0.2 % + 4) ±(0.2 % + 4)
μA dc 6000 μA 1 μA 100 μV/μA ±(0.2 % + 2) ±(0.2 % + 2)
60.00 mA 0.01 mA 1.8 mV/mA ±(0.2 % + 4) ±(0.2 % + 4)
mA dc 400.0 mA [1] 0.1 mA 1.8 mV/mA ±(0.2 % + 2) ±(0.2 % + 2)
6.000 A 0.001 A 0.03 V/A ±(0.2 % + 4) ±(0.2 % + 4)
A dc 10.00 A [2,3] 0.01 A 0.03 V/A ±(0.2 % + 2) ±(0.2 % + 2)
[1] 400 mA continuous; 600 mA for 18 hr maximum.
[2] W10 A continuous up to 35 °C. < 20 minutes on, 5 minutes off at 35 °C to 55 °C. >10 A to 20 A for 30 seconds maximum, 5 minutes
off.
[3] >10 A accuracy unspecified.
Capacitance
Range Resolution Accuracy
10.00 nF 0.01 nF
100.0 nF 0.1 nF ±(1.0 % + 2) [1]
1.000 μF 0.001 μF
10.00 μF 0.01 μF
100.0 μF 0.1 μF
9999 μF 1 μF
±(1.0 % + 2)
[1] With a film capacitor or better, using the rel mode to zero residual.
Diode
Range Resolution Accuracy
2.000 V 0.001 V ±(1.0 % + 1)
Frequency
Range Resolution Accuracy
199.99 Hz 0.01 Hz
1999.9 Hz 0.1 Hz
19.999 kHz 0.001 kHz
199.99 kHz 0.01 kHz
±(0.005 % + 1) [1]
>200 kHz 0.1 kHz Unspecified
[1] From 0.5 Hz to 200 kHz and for pulse widths > 2 μs.

27 II/28 II
Calibration Information
8
Frequency Counter Sensitivity and Trigger Levels
Minimum Sensitivity (RMS Sine Wave)
Input Range 5 Hz – 20 kHz 0.5 Hz – 200 kHz
Approximate Trigger Level
(DC Voltage Function)
600 mV dc 70 mV (to 400 Hz) 70 mV (to 400 Hz) 40 mV
600 mV ac 150 mV 150 mV -
6 V 0.3 V 0.7 V 1.7 V
60 V 3 V 7 V (≤140 kHz) 4 V
600 V 30 V 70 V (≤14.0 kHz) 40 V
1000 V 100 V 200 V (≤1.4 kHz) 100 V
Duty Cycle (Vdc and mVdc)
Range Accuracy
0.0 % to 99.9 % [1] Within ±(0.2 % per kHz + 0.1 %) for rise times < 1 μs.
[1] 0.5 Hz to 200 kHz, pulse width >2 μs. Pulse width range is determined by the frequency by the frequency of the signal.
Input Characteristics
Function Overload
Protection
Input
Impedance
(nominal)
Common Mode
Rejection Ratio
(1 kΩunbalance)
Normal Mode Rejection
L1000 V rms > 120 dB at dc, 50 Hz or
60 Hz > 60 dB at 50 Hz or 60 Hz
1000 V rms
10 MΩ<100 pF > 120 dB at dc, 50 Hz or
60 Hz > 60 dB at 50 Hz or 60 Hz
K1000 V rms 10 MΩ< 100 pF
(ac-coupled) > 60 dB, dc to 60 Hz
Full Scale Voltage Typical Short Circuit Current
Open Circuit
Test Voltage To 6 MΩ5 MΩor
60 nS 600 Ω6 kΩ60 kΩ600 kΩ6 MΩ50 MΩ
Ω1000 V rms <2.8 V dc <850 mV dc <1.3 V dc 500 μA 100 μA 10 μA 1 μA 0.2 μA0.1μA
G1000 V rms <2.8 V dc 2.200 V dc 1.0 mA typical
MIN MAX Recording
AccuracyNominal Response
27 II 28 II
100 ms to 80 %
Specified accuracy ±12 counts for changes
>200 ms in duration
(±40 counts in ac with beeper on)
100 ms to 80 %
(dc functions) Specified accuracy ±12 counts for
changes >200 ms in duration
120 ms to 80 %
(ac functions)
Specified accuracy ±40 counts for
changes >350 ms and inputs >25 %
of range
250 μs (peak) [1]
Specified accuracy ±100 counts for
changes >250 μs in duration
(add ±100 counts for readings over
6000 counts)
(add ±100 counts for readings in Low
Pass mode)
[1] For repetitive peaks: 1 ms for single events.

Digital Multimeters
Basic Maintenance
9
Basic Maintenance
XWWarning
To avoid possible electric shock or personal injury, repairs or
servicing covered in this manual should be performed only by
qualified personnel.
General Maintenance
Periodically 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 and can falsely activate the Input
Alert feature. Clean the terminals as follows:
1. Turn the Meter off and remove all test leads.
2. Shake out any dirt that may be in the terminals.
3. Soak a clean swab with mild detergent and water. Work the swab around in each
terminal. Dry each terminal using canned air to force the water and detergent out of
the terminals.
XWWarning
To avoid electrical shock or personal injury, remove the test
leads and any input signals before replacing the battery or
fuses. To prevent damage or injury, install ONLY specified
replacement fuses with the amperage, voltage, and speed
ratings shown in Table 7.
Fuse Test
As shown in Figure 1, with the Meter in the function, insert a test lead into the
jack and place the probe tip on the other end of the test lead against the metal of the
current input jack. If “LEAd” appears in the display, the probe tip has been inserted too far
into the amps input jack. Back the lead out a bit until the message disappears and either
OL or a resistance reading appears in the display. The resistance value should be as
shown in Figure 1. If the tests give readings other than those shown, have the Meter
serviced.
Touch top half
of input contacts
Good F1 fuse: 00.0 Ω to
00.5 Ω
Replace fuse: OL
Good F2 fuse: 0.995 kΩ to
1.005 kΩ
Replace fuse: OL
gaq105.eps
Figure 1. Current Fuse Test

27 II/28 II
Calibration Information
10
How to Replace the Batteries
XWWarning
To avoid false readings, which could lead to possible electric
shock or personal injury, replace the battery as soon as the
battery indicator () appears. If the display shows “batt” the
Meter will not function until the battery is replaced.
Replace the battery as follows, refer to Figure 2:
1. Turn the rotary switch to OFF and remove the test leads from the terminals.
2. Remove the six Phillips-head screws from the case bottom and remove the battery
door ().
Note
While lifting the battery door, ensure the rubber gasket stays attached to
the battery compartment barrier.
3. Remove the three batteries and replace all three with AA Alkaline batteries ().
4. Ensure the battery compartment gasket () is properly installed around the outside
edge of the battery compartment barrier.
5. Replace the battery door by aligning the battery compartment barrier with battery
compartment.
6. Secure the door with the six Phillips-head screws.
How to Replace the Fuses
Referring to Figure 2, examine or replace the Meter's fuses as follows:
1. Turn the rotary switch to OFF and remove the test leads from the terminals.
2. Refer to step 2 under the How to Replace the Batteries section above to remove the
battery door.
3. Remove the fuse compartment seal () from the fuse compartment.
4. Gently lift out the fuse compartment door () from the fuse compartment.
5. Remove the fuse by gently prying one end loose, then sliding the fuse out of its
bracket ().
6. Install ONLY specified replacement fuses with the amperage, voltage, and speed
ratings shown in Table 7. The 440-mA fuse is shorter than the 10-A fuse. For correct
placement of each fuse, note the marking on the printed circuit board under each
fuse.
7. Replace the fuse compartment door by aligning the arrow on the fuse door with the
arrow on the case bottom and lowering the door into the fuse compartment.
8. Replace the fuse compartment seal by aligning the tab on the seal with the outline on
the case bottom. Ensure the seal () is properly seated.
9. Refer to steps four through six under the Replacing the Batteries section above to
reinstall the battery door.

Digital Multimeters
11
1
4
5
6
2
3
gaq10.eps
Figure 2. Battery and Fuse Replacement
Performance Tests
XWWarning
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. Performance tests should
be performed bi-annually to ensure that the Meter is within accuracy specifications. If the
Meter fails any part of the test, calibration adjustment and/or repair is indicated.
In the performance tests, the Meter is referred to as the unit under test (UUT).

27 II/28 II
Calibration Information
12
Required Equipment
Table 2 lists the equipment required to conduct a performance test on the Meter.
Table 2. Required Equipment
Recommended Equipment Measurement Function Accuracy
DC Volts 0 to 1000 V
±0.012 %
DC Current 350 μA to 2 A
±0.05 %
AC Volts 0 to 1000 V
±0.15 % @ 60 Hz to 20 kHz ±3 %
AC Current 350 μA to 2 A
±0.39 % @ 60 Hz to 1 kHz
Resistance 1 Ωto 100 MΩ
±0.06 %
Capacitance 9 to 900 μF
±0.475 %
5520A Multi-product Calibrator
(or equivalent)
Frequency 19.999 to 199.99 kHz, ±0.0137 %
150 mV to 6 Vrms, ±5 %
K-type Thermocouple, mini-plug
on both ends
Temperature

Digital Multimeters
Performance Tests
13
Testing Meter Accuracy
To test the accuracy of the Meter, perform the steps in Table 3.
Table 3. Accuracy Tests
Display Reading
Step Test
Function Range 5520A Output
27 II 28 II
1 600 mV 60 mV, 60 Hz 59.4 to 60.6 59.2 to 60.8
2 600 mV 330 mV, 60 Hz 328.0 to 332.0 327.3 to 332.7
3 600 mV 600 mV, 13 kHz 575.0 to 625.0 586.0 to 614.0
4 6 V 675 mV, 60 Hz 0.669 to 0.681 0.666 to 0.684
5 6 V 3.3 V, 60 Hz 3.280 to 3.320 3.273 to 3.327
6 6 V 3.3 V, 20 kHz 3.158 to 3.442 3.214 to 3.386
7 60 V 6.75 v, 60 Hz 6.69 to 6.81 6.68 to 6.82
8 60 V 33 V, 60 Hz 32.80 to 33.20 32.75 to 33.25
9 60 V 33 V, 20 kHz 31.58 to 34.42 N/A
10 60 V 33 V, 5 kHz 32.30 to 33.7 N/A
11 600 V 67.5 V, 60 Hz 66.9 to 68.1 66.8 to 68.2
12 600 V 330 V, 60 Hz 328.0 to 332.0 327.5 to 332.5
13 600 V 330 V, 2.5 kHz 323.1 to 336.9 323.0 to 337.0
14 1000 V 100 V, 60 Hz 96 to 104 97 to 103
15

AC Volts
1000 V 1000 V, 1 kHz 987 to 1013 986 to 1014
16 600 mV 150 mV, 99.95 kHz 99.93 to 99.97 99.93 to 99.97
17

AC Volts
Frequency 600 mV 150 mV,
199.50 kHz
199.48 to 199.52 199.48 to 199.52
18 6 V 0.7 V, 99.95 kHz 99.93 to 99.97 99.93 to 99.97
19
Sensitivity
60 V 7 V, 99.95 kHz 99.93 to 99.97 99.93 to 99.97
20 
Trigger level
6 V 3.4 V, 1 kHz Sq.
Wave
999.8 to 1000.2 999.8 to 1000.2
21 
Duty Cycle
6 V 5 V, 1 kHz, DC
offset 2.5 V Sq.
Wave
49.7% to 50.3 % 49.7 % to 50.3 %
22 6 V 3.3 V dc 3.297 to 3.303 3.297 to 3.303
23 60 V 33 V dc 32.97 to 33.03 32.97 to 33.03
24 600 V 330 V dc 329.7 to 330.3 329.7 to 330.3
25

DC Volts
1000 V 1000 V dc 998 to 1002 998 to 1002

27 II/28 II
Calibration Information
14
Table 3. Accuracy Tests (cont.)
Display Reading
Step Test
Function Range 5520A Output
27 II 28 II
26 600 mV 50 mV dc 49.8 to 50.2 49.8 to 50.2
27

DC Volts600 mV 330 mV dc 329.6 to 330.4 329.6 to 330.4
28 600 Ω330 Ω( Use 2 wire
Comp)
329.1 to 330.9 329.1 to 330.9
29 6 kΩ3.3 kΩ(Use 2 wire
Comp)
3.292 to 3.308 3.292 to 3.308
30 60 kΩ33 kΩ32.92 to 33.08 32.92 to 33.08
31 600 kΩ330 kΩ329.2 to 330.8 329.2 to 330.8
32 6 MΩ3.3 MΩ3.292 to 3.308 3.292 to 3.308
33

Ohms
50 MΩ30 MΩ29.69 to 30.31 29.69 to 30.31
34 nS
Conductance
60 nS 100 MΩ9.60 to 10.40 9.60 to 10.40
35 
Diode
6 V 2.0 V dc 1.979 to 2.021 1.979 to 2.021
36 
AC Amps
6 A 3.0 A, 60 Hz 2.953 to 3.047 2.968 to 3.032
37 
DC Amps
6 A 3.0 A 2.990 to 3.010 2.990 to 3.010
38 60 mA 33 mA, 60 Hz32.48 to 33.52 32.65 to 33.35
39

AC Milliamps 400 mA 330 mA, 60 Hz324.8 to 335.2 326.5 to 333.5
40 60 mA 33 mA 32.89 to 33.11 32.89 to 33.11
41

DC Milliamp400 mA 330 mA 329.1 to 330.9 329.1 to 330.9
42 600 μA 330 μA, 60 Hz 324.8 to 335.2 326.5 to 333.5
43 
AC Microamps 6000 μA 3300 μA, 60 Hz 3248 to 3352 3265 to 3335
44 600 μA 330 μA 328.9 to 331.1 328.9 to 331.1
45

DC Microamps 6000 μA 3300 μA 3291 to 3309 3291 to 3309
46 10 nf Open input 10.28 to 0.48 0.28 to 0.48
47 100 nf 5 nf 2 4.7 to 5.3 4.7 to 5.3
48
E
Capacitance
100 μf 9.5 μf 9.2 to 9.8 9.2 to 9.8
49 1000 V 400 V, 400 Hz N/A 372 to 408
50

Low Pass
Filter - 28 II
1000 V 400 V, 800 Hz 3N/A 226 to 340
51 VDC Peak
Min/Max – 28 II
6 V 8 Vpp, 2 kHz Sq.
Wave, DC offset 2
V
N/A Min = -1.898 to -
2.102
Max = 5.896 to 6.104

Digital Multimeters
Calibration Adjustments
15
Table 3. Accuracy Tests (cont.)
Display Reading
Step Test
Function Range 5520A Output
27 II 28 II
52 0 °C N/A -1.0 to 1.0
53
mVdc
Temperature 4
– 28 II 100 °C N/A 98.0 to 102.0
54 Press backlight
button
Backlight comes
on
Backlight comes on
55 Press backlight
button
Backlight
intensifies
Backlight intensifies
56
Backlight
Press backlight
button
Backlight goes off Backlight goes off
[1] Remove test leads from unit.
[2] Use REL to compensate for internal Meter and lead capacitance (must disconnect test leads from calibrator before pushing REL)
[3] The Meter accuracy is not specified at this input signal frequency with Low-pass filter selected. The display reading shown, checks
that the Low-pass filter is active and follows an expected roll-off curve.
[4] To ensure accurate measurement, the Meter and thermocouple adapter must be at the same temperature. After connecting the
thermocouple adapter to the Meter allow for reading to stabilize before recording display reading.
Calibration Adjustments
Perform the Calibration Adjustment Procedure if the Meter fails any performance tests. If
the adjustment routine is discontinued prior to completion, no changes are made to the
calibration contstants that are stored in memory. The following is an explanation of the
pushbutton features and requirements to enter the CAL mode.
Cal Mode Pushbutton Functions
•The CAL mode will be initiated by holding down the MINMAX pushbutton at power
up and entering a four digit password.
•The AutoHOLD pushbutton will act as an "ENTER" key and will advance through
the CAL initiation and adjustment procedure steps.
•The pushbuttons are used to select a four-digit password.
During initiation of the CAL mode, a display count will show how many times
calibration constants have been written to memory.
Entering and Displaying the Four-Digit Password
When the Meter was manufactured it was given a default password of 1234. The
following pushbuttons are used to select the password. Each pushbutton represents the
indicated digit.
Yellow = 1 MINMAX = 2 RANGE = 3 AutoHOLD = 4
Backlight =5 Continuity = 6 REL = 7 Hz = 8
After selecting the password the user has two choices:
Pressing AutoHOLD will display "C-01" which indicates correct password and
successful entry. You may now proceed with the first calibration step.
Pressing RANGE will display "----", which indicates correct password, proceed to
select a new password.
If the password is incorrect, the concluding AutoHOLD or RANGE pushbutton press will
instead cause the Meter to double beep and the display will show "????". The password
entry process was unsuccessful and can be tried again or you may exit this mode by
turning the Meter off.

27 II/28 II
Calibration Information
16
Changing the Password
To change the password in the Meter:
1. Turn the Meter Rotary Switch from OFF to VAC mode while holding down the
MINMAX pushbutton at the same time. The Meter will display YCAL.
2. Press the AutoHOLD pushbutton twice. The display should show "????"
3. Using the pushbuttons select the old password (do not use AutoHOLD to save the
password)
4. Press the RANGE pushbutton. The Meter should display "_ _ _ _" .
5. Use the pushbuttons to select a desired new password.
6. Press AutoHOLD to save the new password.
Restoring the Default Password
If the password has been forgotten, the default password (1234) can be restored by
performing the following:
1. Turn the rotary switch of the Meter to OFF.
2. Remove the bottom case and bottom shield of the Meter.
3. Check the revision number on the PCB. Board revision location is identified in
Figures 3 and 4 below.

Digital Multimeters
Calibration Adjustments
17
If the revision number is 010:
4. Remove the PCB from the top case.
5. Apply power to the PCB by clipping on a dc voltage between 3.5 V and 5 V at the
test points marked “+” and “-” at the edge of the board. See Figure 3.
5
TP2
TP1
S7
S11
3.5 - 5 V
6
6
7
8
7
2X-2- 3001 REV 010
2X-2- 3001 REV 010
gaq101.eps
Figure 3. Revision 010 Board Layout
6. While shorting across keypad button S7, turn the rotary switch one position
clockwise. See Figure 3.
7. Short across keypad button S11. See Figure 3.
8. Turn the rotary switch one position counterclockwise, back to its original position.
9. The default password is now restored.
10. Reassemble the Meter before performing adjustments or testing.

27 II/28 II
Calibration Information
18
If the revision number is 011 or higher:
4. Apply power to the PCB by clipping on a dc voltage between 3.5 V and 5 V at the
test points marked “+” and “-” at the edge of the board. See Figure 4.
S11
4
3.5 - 5 V
5
6
S11
2X-2- 3001 REV 011
2X-2- 3001 REV 011
gaq102.eps
Figure 4. Revision 011 Board Layout
5. Turn the rotary switch from OFF to while holding down MIN MAX at the same
time. The Meter should display CAL.
6. Short across keypad button S11 on the back of the PCB. See Figure 4. The Meter
should beep.
7. Turn the rotary switch one position counterclockwise, back to the OFF position.
8. The default password is now restored.
9. Reassemble the Meter before performing adjustments or testing.

Digital Multimeters
Calibration Adjustments
19
Other Pushbutton Functions
Table 4 list the button on the Meter and describes what the button does when pressed
after the password has been entered and pressed.
Table 4. Pushbutton Functions During Cal Mode
Button Cal Mode Description

(yellow)
Press and hold to test the present function. The measurement is not calibrated so it may be
inaccurate. This is normal.
Press and hold to display the required input level.
Press and hold to display the frequency of the input signal.
Press to store the new calibration adjustment value and advance to the next step. This
pushbutton is also used to exit calibration adjustment mode after the calibration adjustment
sequence is complete.
Calibration Adjustment Procedure
In the following procedure, some adjustment steps take longer to execute than others (10
to 15 Seconds). For some of these steps the Meter gives a double beep to indicate
completion. Not all steps have this feature.
1. Turn the rotary switch of the Meter from OFF to while holding down at
the same time. The Meter should display CAL.
2. Press once to see the number of calibrations that have been completed. Press
again to enable password entry. The Meter should display "????".
3. Use the keypad pushbuttons to enter the existing password and press . The
Meter should display Y.
4. Apply the value listed in Table 5 or 6 for each calibration step, and/or (optional)
press the to display the required input signal level and press to display
the required input signal frequency.
Note
After pressing , wait until the step number advances before changing
the calibrator source or turning the rotary switch of the Meter. If the
reference source input is not within an anticipated range of the required
value, the Meter will emit a double beep and not allow completion of the
step. Set the calibrator to standby prior to changing the function switch
position and or after completing adjustment of each function. If the
calibration adjustment is not completed correctly, the Meter will not
operate correctly.

27 II/28 II
Calibration Information
20
Table 5. Fluke 27 II Calibration Adjustment Steps
Function
(Switch Position) Adjustment Step Input Value
C-01 0 mV, 0 Hz
C-02 6.0 mV, 60 Hz
C-03 60.0 mV, 60 Hz
C-04 600.0 mV, 60 Hz
C-05 600.0 mV, 20 kHz
C-06 6.0 V, 60 Hz
C-07 6.0 V, 20 kHz
C-08 60.0 V, 60 Hz
C-09 60.0 V, 20 kHz
C-10 600.0 V, 60 Hz

(AC Volts)
C-11 600.0 V, 10 kHz
C-12 6.0 V
C-13 60.0 V

(DC Volts)
C-14 600.0 V
C-15 600.0 mV

(DC Millivolts) C-16 60.00 mV
C-17 600.0 Ω
C-18 6.000 kΩ
C-19 60.00 kΩ
C-20 600.0 kΩ
C-21 6.000 MΩ
C-22 0.000 Ω

(Ohms)
C-23 50.0 MΩ

(Diode Test) C-24 3.000 V
C-25 0.000 A, 0 Hz
C-26 60.0 mA 60 Hz
C-27 6.0 A, 60 Hz

(Amps)
C-28 6.0 A, 0 Hz
C-29 0.0 mA, 0 Hz
C-30 600.0 μA, 60 Hz
C-31 6.0 mA, 60 Hz
C-32 60.0 mA, 60 Hz
C-33 400.0 mA, 60 Hz
C-34 60.0 mA, 0 Hz

(Milliamps)
C-35 400.0 mA, 0 Hz