77Fluke adjustment.pdf

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®
77,75,73,70
23,21
Series III Multimeters
Calibration Information
Warning
These service instructions are for use by qualified personnel only. To avoid
electric shock, do not perform any servicing unless you are qualified to do so.
Introduction
This document contains specifications, general maintenance information, and performance tests for the
Fluke 70, 73, 75, 77, 21, and 23 Series III Multimeters (collectively called the Series III Meters).
How to Contact Fluke
To contact Fluke, call one of the following telephone numbers:
1-888-99FLUKE (1-888-993-5853) in U.S.A.
1-800-36-FLUKE (1-800-363-5853) in Canada
+31-402-678-200 in Europe
+81-3-3434-0181 Japan
+65-738-5655 Singapore
+1-425-446-5500 from other countries
Or, visit Fluke’s Web site at www.fluke.com .
F) with relative
humidity to 90%. AC conversions are ac-coupled, average responding, and calibrated to the RMS value of a
sine wave input. Refer to Table 1 for product specifications.
°
C to 28
°
C (64
°
F to 82
PN 659141
November 1997 Rev.2, 12/02
©1997,1999,2002 Fluke Corporation. All rights reserved. Printed in U.S.A.
1
Specifications
Accuracy is specified for a period of one year after calibration, at 18
°
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7x, 2x Series III
Calibration Information
Accuracy specifications are given as:
±
([% of reading] + [number of least significant digits])
Table 1. Specifications
Maximum Voltage Between any Terminal and
Earth Ground:
Rated Voltage
Display
Digital:
Analog:
3,200 counts, updates 2.5/sec
31 segments, updates 25/sec
Response Time of Digital Display:
V ac:
V dc:
Ω :
< 2 s
< 1 s
< 1 s to 320 k Ω ,
< 2 s to 3.2 M Ω ,
< 10 s to 32 M Ω
Operating Temperature:
0 ° C to 50 ° C
Storage Temperature:
-40 ° C to 60 ° C
Temperature Coefficient:
0.1 x (specified accuracy)/ ° C (<18 ° C or >28 ° C)
Electromagnetic Compatibility in RF field of 3 V/m
on all functions except M Ω
77, 75, 23, 21:
70:
73:
Total accuracy = Specified accuracy
Total accuracy = Specified accuracy plus +2.0%
Total accuracy =+2.5%
M Ω accuracy:
70:
73:
77, 75, 23, 21:
Total accuracy = Specified accuracy plus +5.4%
Total accuracy = +2.9%
M is not specified
Relative Humidity
except 32 M Ω Range:
0% to 90% (0 ° C to 35 ° C)
0% to 70% (35 ° C to 50 ° C)
0% to 80% (0 ° C to 35 ° C)
0% to 70% (35 ° C to 50 ° C)
32 M Ω Range only:
Altitude
Operating:
Storage:
2000 meters
12,000 meters
Battery Type:
2000 hrs typical with alkaline
1600 hrs typical with carbon zinc
Continuity Beeper:
4096 Hz
Shock, Vibration:
per MIL-T-PRF 28800F Class III, Sinusoidal, Non Operating
Size (H x W x L)
70/73:(without holster)
77/75/23/21:
2.8 cm x 7.5 cm x 16.6 cm (1.12 in x 2.95 in x 6.55 in)
3.7 cm x 8.9 - 7.8 cm x 19 cm (1.5 in x 3.5 - 3.1 in x 7.49 in)
Weight
70/73:
77/75/23/21:
340 g (12.0 oz)
365 g (12.9 oz)
Safety
70/73:
600 V CAT II per ANSI/ISA S82.01-1994, EN 61010-1: 1993, CSA C22.2
No 1010.1-92, UL 3111-1.
600 V CAT III
600 V CAT III and 1000 V CAT II per ANSI/ISA S82.01-1994, EN 61010-1:
1993, CSA C22.2 No 1010.1-92, UL 3111-1.
21/75:
23/77:
EMC Regulations:
EN 61326-1: 1997
Certifications/Listings:
CSA, UL, TÜV
2
Battery Life:
9 V, NEDA 1604 or 6F22 or 006P, or NEDA 1604A or 6LR61
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Multimeters
Specifications
Table 1. Specifications (cont.)
Function
Range
Accuracy
3.200 V, 32.00 V, 320.0 V
600 V
1000 V (23/77)
±
(0.3%+1)
±
(0.4%+1)
±
(0.4%+1)
m
320.0 mV
± (0.3%+1)
(45 to 500 Hz, 3.2V range.
Other ranges 45 to 1 kHz)
3.200 V, 32.00 V,
320.0 V, 600 V
1000 V (23,77)
± (2%+2)
± (2%+2)
± (2%+2)
21/70/73/75
320.0
Ω
±
(0.5%+2)
3200
Ω
, 32.00 k
Ω
,
±
(0.5%+1)
320.0 k
Ω
, 3.200 M
Ω
±
(0.5%+1)
±
32.00 M
Ω
(2%+1)
23/77
320.0
Ω
±
(0.5%+3)
3200
Ω
, 32.00 k
Ω
,
±
(0.5%+1)
320.0 k
Ω
, 3.200 M
Ω
±
(0.5%+1)
±
32.00 M
Ω
(2%+1)
2.0 V
± (1% typical)
Function
Range
Accuracy
Typical Burden Voltage
(45 Hz to 1 kHz)
(73/75/77/23/21)
32.00 mA, 320.0 mA
10.00 A *
± (2.5%+2)
± (2.5%+2)
6 mV/mA
50 mV/A
(73/75/77/23/21)
32.00 mA, 320.0 mA
10.00 A *
± (1.5%+2)
± (1.5%+2)
6 mV/mA
50 mV/A
* 10 A continuous, 20 A for 30 seconds maximum.
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7x, 2x Series III
Calibration Information
Table 1. Specifications (cont.)
Function
Input Impedance (Nominal)
, m
,
>10 M Ω , <50 pF
Common Mode Rejection Ratio (1 k Ω
Unbalanced)
Normal Mode Rejection
, m
>120 dB at dc, 50 Hz, or 60 Hz
>60 dB at 50 Hz or 60 Hz
>60 dB dc to 60 Hz
Open Circuit Test Voltage
Full Scale Voltage
To 3.2 M Ω
32 M Ω
<3.1 V dc
<2.8 V dc (typical)
<440 mV dc
<420 mV dc (typical)
<1.4 V dc
<1.3 V dc (typical)
<3.1 V dc
2.0 V dc
Typical Short Circuit Current
70/73/21/75:
77/23:
400
µ
A
300 µA
500
µ
A
400 µA
V F
Typical Test Current
0.0 V
0.6 V
1.2 V
2.0 V
70/73/21/75:
0.5 mA
0.4 mA
0.3 mA
0.1 mA
23/77:
0.4 mA
0.3 mA
0.2 mA
0.1 mA
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Multimeters
PCA Access and General Maintenance
PCA Access and General Maintenance
Warning
To avoid electrical shock, remove the test leads before opening the case, and
close the case before operating the meter. To prevent fire, install fuses with the
rating shown on the back of the meter.
Caution
To avoid contaminating the pca with oil from the fingers, handle it by the edges
or wear gloves. Pca contamination may not cause immediate instrument failure
in controlled environments. Failures typically show up when contaminated
units are operated in humid areas.
Use the following procedure for removing the pca (printed circuit assembly) from its case:
1. Set the function switch to OFF, and disconnect test leads if they are installed.
2. Remove the four Phillips screws from the bottom cover.
3. Turn the meter face up, grasp the top cover, and pull the top cover from the meter. For most models,
this will best be accomplished by first lifting up the top cover at the input terminal end, followed by the
display end.
4. Some Series III Meters have a fuse on the lower portion of the pca. This fuse must be removed to
access the screw that holds the pca to the case bottom.
5. The pca may now be removed from the bottom cover.
Display Access
Caution
Do not handle the conductive edges of the LCD interconnects. If contaminated,
clean with alcohol.
Refer to Figure 1 or 2 depending on the model.
1. Remove the four Phillips screws from the back side of the pca.
2. Remove the LCD mounting bracket.
3. Insert a small screwdriver under the edges of the display holding bracket, and gently pry the bracket
loose from the snaps.
4. Turn the bracket upside down to remove the LCD.
5. Before installing a new LCD, make sure that all connector contact points are clean.
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