®
12
Multimeter
Users Manual
PN 2063508
January 2003
© 2003 Fluke Corporation. All rights reserved. Printed in China.
All product names are trademarks of their respective companies.
12 Multimeter
Users Manual
Recording Minimum and Maximum Reading with Elapsed Time ............ 19
Capturing Continuity Intermittents with Continuity Capture .................. 21
TURNING BEEPER OFF............................................................................ 23
MAINTENANCE.......................................................................................... 23
NReplacing the Battery........................................................................ 23
Replacing the Test Leads ....................................................................... 23
Service and Parts.................................................................................... 24
Accessories............................................................................................. 24
SPECIFICATIONS...................................................................................... 24
ii
READ FIRST: SAFETY INFORMATION
This meter has been designed and tested in accordance with IEC Publication 1010. To
ensure that the meter is used safely, follow all safety and operating instructions in this
manual. If the meter is not used as described in this manual, the safety features of the
meter might be impaired.
WWarning
To avoid false readings, which could lead to possible electric shock or personal
injury, replace the battery as soon as the battery indicator (N) appears.
•
Do not use the meter if the meter or test leads look damaged, or if you suspect
that the meter is not operating properly.
•
Turn off power to the circuit under test before cutting, unsoldering, or breaking the
circuit. Small amounts of current can be dangerous.
•
•
Do not apply more than 600 V rms between a terminal and earth ground.
Use caution when working above 60 V dc or 30 V ac rms. Such voltages pose a
shock hazard.
•
•
When using the probes, keep your fingers behind the finger guards on the probes.
Disconnect the live test lead before disconnecting the common test lead.
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SYMBOLS
The following international electrical symbols are used in this manual:
W Important Safety Information in Manual
Not Applicable to Identified Model
B
AC
F
DC
G
E
J
Diode
Capacitor
Ground
Double Insulation
T
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DISPLAY
DISPLAY
Figure 1. Display
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OPERATING FEATURES
Figure 2. Operating Features
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STANDBY MODE
STANDBY MODE
In standby mode, the display goes blank to preserve battery life. The meter beeps and
enters Standby if it is ON but inactive for more than 45 minutes. Press any pushbutton
to resume operation. Standby is not allowed if the meter is in the MIN MAX mode.
INPUT RANGES
The input range determines the highest value the meter will measure. Most functions
have more than one range (see SPECIFICATIONS). If the range is too low, the display
shows OL (overload). If the range is too high, the display will show fewer digits of
resolution.
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Autoranging
The meter defaults to autorange when you turn it on. In autorange, the meter selects
the range automatically.
Manually Selecting a Range
The meter also has a manual range mode. In manual range, you select and lock the
meter in a range. To manually select a range:
1. Press [V]. The meter is locked in the range it is in, and V is displayed. In manual
range, i is disabled.
2. Press [V] to step through the ranges. NOTE: The 4000 mV range, which can only
be entered in manual range, is convenient when using accessories.
3. To return to autorange, press [V] for 2 seconds (until V is no longer displayed), or
change the measurement function.
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MEASURING VOLTAGE
MEASURING VOLTAGE
1. Insert the test leads in the jacks.
2. To select a voltage function, put the slide-switch in the middle position. See
Figure 3.
To toggle between dc and ac, press [g].
3. Touch the probes to the test points, and read the display. The meter beeps an
Overload Alert™ when OL (overload) is displayed.
In manual range, you can toggle the meter between a high or low input impedance
mode by moving the slide-switch between the voltage and continuity/ohms positions.
(See “i AND HOW TO USE IT”.) In the continuity/ohms position, the input
impedance of the meter is 2 kΩ, and LoZ is displayed to indicate that the meter is in
the low input impedance mode. In the volts position, the input impedance is 5 MΩ in ac
and 10 MΩ in dc.
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Figure 3. Measuring Voltage
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TESTING CONTINUITY AND MEASURING RESISTANCE
TESTING CONTINUITY AND MEASURING RESISTANCE
1. Insert the test leads in the jacks, and turn off power to the circuit under test.
External voltage across the components causes invalid readings.
2. Put the slide-switch in the continuity/ohms position (Figure 4).
To toggle between the continuity/diode and ohms functions, press [g].
3. Touch the probes to the test points.
4. In ohms, read the resistance on the display.
In continuity test, the beeper sounds continuously if continuity exists (resistance
< 25 Ω.). Opens and shorts longer than 250 µs are detected. On the Fluke 12,
short-to-open and open-to-short transitions can be captured and visually
displayed. See “Capturing Continuity Intermittents”.
If the meter detects a voltage greater in magnitude than about 4.5 V and the meter is
not in the manual range mode, the meter automatically changes to the voltage
measurement function. (See “CHEK AND HOW TO USE IT”.)
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Figure 4. Continuity and Resistance Measurements
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TESTING DIODES
TESTING DIODES
1. Insert the test leads in the jacks.
2. Put the slide-switch in the continuity/ohms position. The meter selects either the
continuity/diode (RG) or ohms (e) function.
If ohms is selected, press [g] to toggle to the continuity/diode function. To toggle
the beeper on or off in continuity/diode test, press [V]. Ris displayed when the
beeper is enabled.
3. Touch probes to the diode (Figure 5A). A forward-voltage drop of about 0.6 V
(typical for a silicon diode) causes the meter to beep once.
4. Reverse probes (Figure 5B). If the diode is good, OL is displayed. If the diode is
shorted (Figure 5C), the beeper sounds continuously in at least one direction.
If the diode is open, OL is displayed in both directions.
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Figure 5. Testing Diodes
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VCHEK AND HOW TO USE IT
VCHEK AND HOW TO USE IT
i is a subset of the continuity/ohms function. In i, the meter is designed to
automatically display an ac or dc voltage when the meter detects a voltage greater in
magnitude than about 4.5 V and the meter is not in the manual range mode. THIS
WILL NOT HARM THE METER. i is always enabled (and k is displayed) when
the meter is in the continuity/ohms function unless the meter is in one of the following:
•
•
•
The manual range mode (i.e., Zis displayed)
The MIN MAX mode (i.e., j is displayed)
The capacitance function (i.e., µF is displayed)
WWarning
Repetitive transients on a dc bus will cause i to select ac volts, even
though a hazardous dc voltage may be present. To avoid a misleading display
and possible electric shock, manually select the proper volts function for
measurements on these circuits.
In i, the meter has a low input impedance (~2 ke). When a voltage is displayed,
LoZ is also displayed to remind you of this, and the beeper momentarily sounds a
i Alert™. To disable the i Alert in the ohms function, press and hold down
[g] while turning the meter on.
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Use i only on power supplies and other power sources that have a low output
impedance. Do not use i to measure voltage in electronic circuitry unless a 2 ke
load will not damage the circuit. See † on page 27.
DISABLING i WITH FUNCTION LOCK
To lock the meter in either the continuity/diode or ohms function, and disable i:
1. Put the slide-switch in the continuity/ohms position. The meter selects the
continuity/diode or ohms function. Press [g] to toggle between the
continuity/diode and ohms functions.
2. Press [Z] to put the meter in manual range. Zis displayed. The meter is locked in
the selected function and i is disabled.
In continuity/diode test, press [Z] to toggle the beeper on and off.
In ohms, press [Z] to manually select a range.
To remove the function lock and reenable i, press [Z] for 2 seconds, press [g],
or move the slide-switch.
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MEASURING CAPACITANCE
MEASURING CAPACITANCE
First, turn off power to the circuit, and disconnect and discharge the capacitor.
1. Insert test leads, and move the slide-switch to [E]. (See Figure 6.)
2. Press [E]. The capacitance function is selected and µF is displayed.
3. Touch the probes to the capacitor. When measuring polarized capacitors, be sure
to connect the positive to [2] and the negative to COM. Capacitor dielectric
absorption can cause measurement errors. If more discharge is necessary, the
meter displays “dISC” while the capacitor is discharging.
To exit capacitance, press [E] or [g], or move the slide-switch to another position.
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Figure 6. Measuring Capacitance
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USING MIN MAX FUNCTIONS
USING MIN MAX FUNCTIONS
Recording Minimum and Maximum Readings
MIN MAX records the highest and lowest measurements taken. MIN MAX cannot be
used when the meter is measuring capacitance. In the MIN MAX mode, autoranging,
Standby, and i are disabled.
1. Insert the test leads, and put the meter in volts or ohms.
2. Connect the leads to the circuit.
3. Press [j] to enter MIN MAX. j is displayed, and autorange is disabled. When the
reading changes more than about 50 digits, the meter beeps a short Input Change
Alert™. When a new minimum or maximum is recorded, the meter beeps a longer
MIN MAX Alert™.
4. Press [j] to cycle through maximum, minimum, and present readings (see
Figure 7). To exit MIN MAX and erase the stored readings, press [j] for
2 seconds or change the measurement function.
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Figure 7. Displaying Minimum and Maximum Reading
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USING MIN MAX FUNCTIONS
Recording Minimum and Maximum Reading with Elapsed Time
The MIN MAX with elapsed-time mode records the time (in hours and minutes)
between when MIN MAX was entered and the last high and low was recorded. Time is
kept to 99:59. OL is displayed for longer times.
1. To enable the MIN MAX elapsed-time clock, hold [j] down while moving the
slide-switch from OFF to the volts or continuity/ohms position.
2. Insert the test leads, and put the meter in volts or ohms.
3. Connect the leads to the circuit.
4. Press [j] to select MIN MAX. j is displayed, and time is set to 00:00.
5. Press [j] to step through the display sequence shown in Figure 8.
6. To exit, press [j] for 2 seconds, or change the measurement function.
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Figure 8. Maximum and Minimum Reading with Elapsed Time
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USING MIN MAX FUNCTIONS
Capturing Continuity Intermittents with Continuity Capture
When testing continuity, the meter can capture intermittents as short as 250 µs, and
display them as open-to-short and short-to-open transitions.
1. Put the slide-switch in the continuity/ohms position.
2. Connect the leads to the circuit.
3. Press [j]. The display shows the initial condition (either an open or short) as
shown in Figure 9, and j is displayed.
If the meter detects a transition, it beeps and the display captures the transition
(see Figure 9). Subsequent transitions cause the meter to beep, but the display
does not change.
4. Press [j] to reset the display to the present condition and resume capture mode.
5. To exit, press [j] for 2 seconds or change measurement function.
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Figure 9. Open-to-Short and Short-to-Open Transitions
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TURNING BEEPER OFF
TURNING BEEPER OFF
To disable all beeper functions, press and hold down [Z] for 2 seconds while turning
the meter on.
MAINTENANCE
WWarning
To avoid electrical shock or damage to the meter, do not get water inside the
case. Remove the test leads and any input signals before opening the case.
Periodically wipe the case with a damp cloth and detergent. Do not use abrasives or
solvents.
NReplacing the Battery
The meter uses a 9 V battery (NEDA 1604 or IEC 6F22). To replace the battery,
remove the four screws from the back of the meter and lift off the front. Remove the
battery from case bottom.
Replacing the Test Leads
The meter uses double-insulated test leads. When replacing the test leads, order
Fluke PN 855742 only.
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Service and Parts
This meter should be serviced only by a qualified service technician. To order the
service manual (PN 900824) and other parts or for service information, in the USA call
1-800-825-9810. Outside the USA, contact the nearest Fluke service center.
Accessories
When using accessories, put the slide-switch in the volts position, and manually select
the 4000 mV range for ease of reading.
SPECIFICATIONS
This meter complies with Part 15 of FCC Rules. Operation is subject to the following
conditions: (1) This meter may not cause harmful interference, and (2) this meter must
accept any interference received, including interference that may cause undesired
operation.
Accuracy is specified for a period of one year after calibration, at 18 °C to 28 °C (64 °F
to 82 °F) with relative humidity to 90 %. AC conversions are ac-coupled, average
responding, and calibrated to the rms value of a sine wave input. Accuracy
Specifications are given as:
±([% of reading] + number of least significant digits])
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SPECIFICATIONS
Maximum Voltage Between any
Terminal and Earth Ground
600 V rms
Display
3 3/4-digits, 4000 counts, updates 4/sec
-10 °C to 50 °C
Operating Temperature
Storage Temperature
Temperature Coefficient
Relative Humidity
-30 °C to 60 °C indefinitely (to -40 °C for 100 hrs)
0.1 x (specified accuracy)/°C (<18 °C or >28 °C)
0 % to 90 % (-10 °C to 35 °C)
0 % to 70 % (35 °C to 50 °C)
Battery Type
Battery Life
9 V, NEDA 1604 or IEC 6F22
650 continuous hours with alkaline
450 continuous hours with carbon-zinc
1 meter shock. Per MIL-T-28800D for a Class 3 Instrument
Shock, Vibration
Size (HxWxL)
1.35 in x 2.75 in x 5.55 in
(3.46 cm x 7.05 cm x 14.23 cm)
Weight
Safety
10 oz (286 g)
Designed to Protection Class II requirement of UL 3111,
ANSI/ISA-S82, CSA C22.2 No 231, and VDE 0411, and IEC
1010 overvoltage category III.
EMI Regulations
Complies with FCC Part 15, Class B, and VDE 0871B.
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Function
Range
Resolution
Accuracy (50 to 400 Hz)
4000 mV*
4.000 V
40.00 V
400.0 V
600 V
1 mV
0.001 V
0.01 V
0.1 V
1 V
±(1.9 %+3)
±(1.9 %+3)
±(1.9 %+3)
±(1.9 %+3)
±(1.9 %+3)
4000 mV*
4.000 V
40.00 V
400.0 V
600 V
1 mV
0.001 V
0.01 V
0.1 V
1 V
±(0.9 %+2)
±(0.9 %+2)
±(0.9 %+1)
±(0.9 %+1)
±(0.9 %+1)
400.0 Ω
0.1 Ω
±(0.9 %+2)
±(0.9 %+l)
±(0.9 %+1)
±(0.9 %+1)
±(0.9 %+1)
±(1.5 %+3)
4.000 kΩ
40.00 kΩ
400.0 kΩ
4.000 MΩ
40.00 MΩ
0.001 kΩ
0.01 kΩ
0.1 kΩ
0.001 MΩ
0.01 MΩ
1.000 pF
10.00 µF
100.0 µF
10000 pF
0.001 µF
0.01 µF
0.1 pF
±(1.9 %+2)
±(1.9 %+2)
±(1.9 %+2)
1000 µF ±(1.9 %+2)
>1000 µF ±(10 % + 90) Typical
±(0.9 %+2) †
1.0 µF
2.000 V
0.001 V
* The 4000 mV range can only be entered in manual range mode. Use the 4000 mV range with accessories.
† The beeper is guaranteed to come on at <25 Ω and turn off at >250 Ω. The meter detects opens or shorts of 250 µs or
longer.
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SPECIFICATIONS
Function
Overload
Protection*
Input
Impedance
(Nominal)
Common Mode
Rejection Ratio
(1 kΩ Unbalance)
Normal Mode
Rejection
600 V dc
>10 MΩ <100 pF
>100 dB at dc,
50 Hz or 60 Hz
>50 dB at
50 Hz or 60 Hz
†
& LoZ =
>2 kΩ <200 pF
>5 MΩ <100 pF
600 V rms
>60 dB at dc
†
& LoZ =
>2 kΩ <200 pF
Open Circuit
50 Hz or 60 Hz
Full Scale Voltage
Short Circuit
Current
Test Voltage
To 4.0 MΩ
40 MΩ
600 V rms
<1.5 V dc
2.4-3.0 V dc
<450 mV dc
<1.5 V dc
<500 µA
0.95 mA
(Typical)
600 V rms
2.400 V dc
*3 x 106 V Hz Maximum
†
2 kΩ with input voltage up to 50 V. Impedance will increase with input voltage to >300 kΩ at 600 V.
MIN MAX Recording Accuracy and Response Time
Specified accuracy of measurement function ± 12 digits for changes > 200 ms in duration (±40 digits in ac).
Typical 100 ms response to 80 %.
MIN MAX Recording with Elapsed Time
Accuracy
Elapsed Time
Resolution
0 to 100 hours (99:59)
Continuity Capture
1 minute
0.3 % Typical
Detects opens or shorts of 250 µs or longer
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