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Digi-Sense
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20250-56
Instruction Manual
20 pgs900.56 Kb0

Digi-Sense 20250-55, 20250-56 Instruction Manual

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THE STANDARD IN PRECISION MEASUREMENT
User Manual
Compact Autoranging Clamp Meters
with NIST-Traceable Calibration
Models 20250-55 (400 A AC), 20250-56 (400 A AC/DC)
Introduction
The Digi-Sense Compact Autoranging Clamp Meters (400 A AC Model 20250-55; 400 A AC/DC Model 20250-56) offer all the basic features needed for measurement. The double­molded plastic housing and jaw are designed for use in tight places. A large backlit display provides easy-to-read measurements. The instruments are fully tested and cali­brated to NIST-traceable standards. Careful use of the meter will provide years of reliable service.
Safety
International Safety Symbols
This symbol, adjacent to another symbol or terminal, indicates the user must refer to the manual for further information.
This symbol, adjacent to a terminal, indicates that, under normal use, hazardous voltages may be present
Double insulation
2
SAFETY NOTES
• Do not exceed the maximum allowable input range of any
function.
• Do not apply voltage to meter when resistance function is
selected.
• Set the function switch OFF when the meter is not in use.
WARNINGS
• Set rotary function switch to the appropriate position
before measuring.
• When measuring volts, do not switch to current/resistance
modes.
• When changing ranges using the rotary function switch,
always disconnect the test leads from the circuit under test.
• Do not exceed the maximum rated input limits:
Input Limits
Function
Maximum Input,
Model 20250-55
Maximum Input,
Model 20250-56
A 400 A AC 400 A AC/DC V 600 V AC/DC 600 V AC/DC
Frequency, Duty
cycle, Resistance,
Diode, Continuity,
250 V AC/DC 250 V AC/DC
Capacitance Test
Temperature (°C/°F) 250 V AC/DC 250 V AC/DC
3
CAUTIONS
• Improper use of this meter can cause damage, shock,
injury or death. Read and understand this user manual before operating the meter.
• Always remove the test leads before replacing the battery.
• Inspect the condition of the test leads and the meter itself for any damage before operating the meter. Repair or replace any damage before use.
• Use great care when making measurements if the voltages are greater than 25 VAC rms or 35 VDC. These voltages are considered a shock hazard.
• Remove the battery if the meter is to be stored for long
periods.
• Always discharge capacitors and remove power from the device under test before performing Diode, Resistance, or Continuity tests.
• Voltage checks on electrical outlets can be difcult and
misleading because of the uncertainty of connection to
the recessed electrical contacts. Other means should be
used to ensure that the terminals are not "live".
• If the equipment is used in a manner not specied by the manufacturer, the protection provided by the equipment
may be impaired.
4
Unpacking
Check individual parts against the list of items below. If anything is missing or damaged, please contact your instrument supplier immediately.
1. Meter
2. Test leads
3. Temperature probe
4. Carrying case
5. 9 V battery
6. User manual
7. NIST-traceable calibration report with data
Key Features
• Built-in noncontact AC voltage detector
• Durable double-molded housing
3
• 1
⁄16" (30 mm) jaw opening
• CAT III 1000 V safety rating
• Electronic overload protection
• Autoranging with auto power-off
• Peak Hold function that captures the peak AC current or
voltage reading (model 20250-56 only)
5
Meter Description (Model 20250-55)
1. Current clamp
2. Noncontact AC voltage
indicator light
3. Clamp trigger
4. Rotary function switch
5. Data HOLD / Backlight button
6. Relative button
7. 4000-count LCD
8. MODE select button
9. Range button
10. Hz% button
11. COM input jack
12. V Ω CAP TEMP Hz jack
13. Battery cover
Meter Description (Model 20250-56)
1. Current clamp
2. Noncontact AC voltage
indicator light
3. Clamp trigger
4. Rotary function switch
5. Data HOLD button
6. Backlight button
7. 4000-count LCD
8. MODE select button
9. PEAK button
10. Relative button
11. COM input jack
12. V Ω CAP TEMP Hz jack
13. Battery cover
6
Ω
Display Layout (Model 20250-55)
1. AC DC AC (alternating current) and
DC (direct current)
2.
Minus sign
–
3. 8.8.8.8 4000 count (0 to 3999)
measurement reading
4. AUTO Autorange mode
5. REL (
6.
7. •))) Audible continuity
8. HOLD Data HOLD mode
9. °C,°F,µm,V,
A,K,M,
10. Hz % Frequency/duty cycle test mode
) Relative mode
Diode test mode
Ω Units of measure list
Display Layout (Model 20250-56)
1. AC DC AC (alternating current) and DC
(direct current)
2.
Minus sign
–
3. 8.8.8.8 4000 count (0 to 3999) measurement
reading with analog bar graph
4. HOLD Data HOLD mode
5. REL (
6. AUTO Autorange mode
7. MAX MIN Max/Min Hold mode
8. Pmax Pmin Pmax Pmin Hold mode
9. •))) Audible continuity
10.
11. Hz % Frequency/duty cycle test mode
12.
°C,°F Units of measure list
) Relative mode
Diode test mode
Ω,F,A,V,
7
Setup and Operation
Note: Read and understand all warning and precaution
statements listed in the safety section of this operation manual prior to using this meter. Set the rotary function
switch to the OFF position when the meter is not in use.
AC and AC/DC Current Measurements WARNING: Ensure that the test leads are disconnected
from the meter before making current clamp measure­ments.
1. Set the rotary function switch to the
400A or 40A or 4A range.
2. For model 20250-56
only, select AC or DC by pressing the MODE button.
3. If the measuring
range is unknown, select the higher
Ω
range rst then
move to the lower range as necessary.
4. Press the trigger to
open jaw. Fully
enclose one conductor to be measured (see diagram).
The LCD will display the reading.
5. In DCA mode, to ensure the reading is correct, press
the REL button to clear the reading on the LCD before
measurement. The LCD will display the reading (model
20250-56 only).
Ω
8
AC/DC Voltage Measurements
1. Insert the black test lead into the negative COM terminal
and the red test lead into the positive V terminal.
2. Set the rotary function switch to the V position.
3. Select AC or DC with the MODE button.
4. Connect the test leads in parallel to the circuit under test.
5. Read the voltage measurement in the display.
Resistance and Continuity Measurements
1. Insert the black test lead into the negative COM terminal
and the red test lead into the positive terminal.
2. Set the rotary function switch to the
Ω •))) position.
3. Touch the test probe tips across the circuit or component
under test. It is best to disconnect one side of the device under test so the rest of the circuit will not interfere with the resistance reading.
4. For Resistance tests, read the resistance value in the
display.
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Diode and Continuity Measurements
Red Black Black Red
Forward test Reverse test
1. Insert the black test lead banana plug into the negative
COM jack and the red test lead banana plug into the positive diode jack.
2. Set the rotary function switch to the
3. Press the MODE button until
“
Ω •))) position.
“
appears in the display.
4. Touch the test probes to the diode under test. Forward
voltage will indicate 0.4 V to 0.7 V. Reverse voltage will
indicate “OL”.. Shorted devices will indicate near 0 mV and an open device will indicate “OL” in both polarities.
5. For Continuity tests, if the resistance is <150 Ω (20250-55)
or <50 Ω (20250-56), a tone will sound.
Capacitance Measurements (Model 20250-56 Only) WARNING: To avoid electric shock, disconnect power to the
unit under test and discharge all capacitors before taking any capacitance measurements. Remove the batteries and unplug the line cords.
1. Set the rotary function switch to the
(CAP) position.
2. Insert the black test lead banana plug into the negative
COM jack and the red test lead banana plug into the positive V jack.
3. Touch the test leads to the capacitor to be tested.
4. Read the capacitance value on the display.
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Frequency or % Duty Cycle Measurements
1. For model 20250-55, set the rotary function switch to the
V position, then press the Hz% button to select “Hz” or “% duty”.
2. For model 20250-56, set the rotary function switch to the
Hz position. (Model 20250-56 does not feature % duty
cycle measurement.)
3. Insert the black lead banana plug into the negative COM
jack and the red test lead banana plug into the positive V jack.
4. Touch the test probe tips to the circuit under test.
5. Read the frequency value on the display.
Temperature Measurements WARNING: To avoid electric shock, disconnect both test
probes from any source of voltage before making a temperature measurement.
1. Set the rotary function switch to °C or °F units.
2. For model 20250-56 only, select °C or °F units by
pressing the MODE button.
3. Insert the temperature probe into the negative COM and
V jacks, making sure to observe the correct polarity.
4. Touch the probe head to the part whose temperature you
wish to measure. Keep the probe touching the part under
test until reading stabilizes (about 30 seconds).
5. Read the temperature in the display. The digital reading
will indicate the proper decimal point and value.
WARNING: To avoid electric shock, be sure the thermocouple has been removed before changing to another measurement function.
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Noncontact AC Voltage Measurements WARNING: Risk of Electrocution. Before use, always test
the voltage detector on a known live circuit to verify proper operation
1. Touch the probe tip to the hot conductor or insert into the
hot side of the electrical outlet.
2. If AC voltage is present, the indicator light will illuminate.
Note: The conductors in electrical cord sets are often
twisted. For best results, rub the probe tip along a length of the cord to assure placing the tip in close proximity to the
live conductor. Note: The detector is designed with high sensitivity. Static
electricity or other sources of energy may randomly trip the sensor. This is normal operation.
MODE Button
To select DC/ACV,OHM/ Diode/Continuity (CAP 20250-56 only).
Data HOLD Button
To “freeze” a reading on the screen, press the HOLD (H) button. While data HOLD is active, the “HOLD” display icon appears on the LCD. Press the data HOLD button again to
resume normal operation.
REL Button
For Offset adjustment. (DCA and Capacitance zero on
model 20250-56 only.)
12
RANGE Button (Model 20250-55 only)
When the meter is rst turned on, it defaults to autorang­ing. This automatically selects the best range for the mea­surements being made and is generally the optimal mode
for most measurements. For measurement situations requiring that a range be manually selected, perform the following:
1. Press the RANGE button. The “AUTO” display indicator
will turn off.
2. Press the RANGE button again to step through the
available ranges until you select the range you want.
3. Press and hold the RANGE button for 2 seconds to exit
the manual ranging mode and return to autoranging.
PEAK Hold Button (Model 20250-56 only)
The PEAK Hold function captures the peak AC voltage or
current. The meter can capture negative or positive peaks as fast as 1 millisecond in duration.
1. Turn the rotary function switch to an A or V position.
2. Use the MODE button to select AC.
3. Allow time for the display to stabilize.
4. Press and hold the PEAK button until “CAL” appears in
the display. This procedure will zero the range selected.
5. Press the PEAK button, “Pmax” will display. The display
will update each time a higher positive peak occurs.
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6. Press the PEAK button again, “Pmin” will display. The
display will now update and indicate the lowest negative peak.
7. To return to normal operation, press and hold the PEAK
button until the “Pmin” or “Pmax” indicator switches off.
Note: If the rotary function switch position is changed after
a calibration, the PEAK Hold calibration must be repeated
for the new function selected.
Automatic Power-Off
To conserve battery life, the meter automatically turns off after 30 minutes of nonuse.
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Specifications
Function
AC Current (50/60 Hz)
DC Current
DC Voltage
AC Voltage (50–400 Hz)
Resistance
Capacitance
Frequency
Temperature, type K (probe accuracy not included)
Range &
Resolution
4.000 AAC ±(2.5% + 12 dgts) — —
40.00 AAC ±(2.5% + 8 dgts) 40.00 AAC ±(2.5% + 8 dgts)
400.0 AAC ±(2.8% + 8 dgts) 400.0 AAC ±(2.8% + 5 dgts)
400.0 mVDC ±(0.8% + 2 dgts) 400.0 mVDC ±(0.8% + 2 dgts)
4.000 VDC
400.0 VDC 400.0 VDC
600.0 VDC ±(2 % + 2 dgts) 600.0 VDC ±(2% + 2 dgts)
40.00 VAC 40.00 VAC
400.0 VAC 400.0 VAC ±(1.5% + 5 dgts)
600.0 VAC ±(2.5% + 8 dgts) 600.0 VAC ±(2% + 5 dgts)
400.0 Ω ±(1.0% + 4 dgts) 400.0 Ω ±(1.0% + 4 dgts)
4.000 KΩ
400.0 KΩ 400.0 KΩ
4.000 MΩ ±(2.5% + 3 dgts) 4.000 MΩ ±(2.5% + 3 dgts)
40.00 MΩ ±(3.5% + 5 dgts) 40.00 MΩ ±(3.5% + 5 dgts)
10 to 10 kHz
Sensitivity:
100 V (<50 Hz);
50 V (50 to 400 Hz;
15 V (401 Hz to
10 kHz)
–20.0 to 760.0°C ±(3% rdg + 5°C) –20.0 to 760.0°C ±(3% rdg + 5°C)
–4.0 to 1400.0°F ±(3% rdg + 9°F) –4.0 to 1400.0°F ±(3% rdg + 9°F)
Model 20250-55 Model 20250-56
— — 40.00 ADC ±(2.5% + 5 dgts) — — 400.0 ADC ±(2.8% + 5 dgts)
— — 400.0 mVAC
— — 40.00 nF ±(5.0% rdg + 20 dgts) — — 400.0 nF
— — 40.00 µF — — 400.0 µF ±(4.0% rdg + 10 dgts) — — 4 mF ±(5% rdg + 10 dgts)
Accuracy
(% of reading)
±(1.5% + 2 dgts)
±(1.8% + 8 dgts)
±(1.5% + 2 dgts)
±(1.5% rdg
+ 2 dgts)
Range &
Resolution
4.000 VDC
4.000 VAC
4.000 KΩ
10 to 100 kHz
Sensitivity: 100 V (<50 Hz); 50 V (50 to 400
Hz; 15 V (401 Hz
to 100 kHz)
Accuracy
(% of reading)
±(1.5% + 2 dgts)40.00 VDC 40.00 VDC
±(1% + 10 dgts)4.000 VAC
±(1.5% + 2 dgts)40.00 KΩ 40.00 KΩ
±(3% rdg + 5 dgts)— — 4.000 µF
±(1.5% rdg
+ 2 dgts)
15
Specifications (continued)
Clamp size Opening 13⁄16" (30 mm) approximately Diode test Test current of 0.3 mA typical;
Continuity Threshold <150 Ω (20250-55), check <50 Ω (20250-56); Test current <0.5 mA
Low-battery “ indication
Overrange “ OL” is displayed indication
Measurement 2 per second, nominal rate
Input 10 MΩ (VDC and VAC) impedance
Display 4000 counts LCD AC Current 50–60 Hz (AAC) (20250-55),
AC Voltage 50–400 Hz (VAC) (20250-55),
Operating 41 to 104°F (5 to 40°C) temperature
Storage –4 to 140°F (–20 to 60°C) temperature
Operating Max 80% up to 87°F (31°C), decreasing humidity linearly to 50% at 104°F (40°C)
Open circuit voltage 1.5 V DC typical (20250-55), <3 V DC typical (20250-56).
” is displayed
50–60 Hz (AAC TRMS) (20250-56)
50–60 Hz (VAC TRMS) (20250-56)
16
Storage humidity <80% Operating 7000 ft (2000 meters) maximum
altitude Overvoltage Category III 600 V Battery One 9 V battery Auto power-off 30 minutes approximately Weight 6.5 oz (183 g) Dimensions 7
3
⁄4" x 23⁄4" x 19⁄16" (19.7 x 7 x 4 cm)
Safety For indoor use and in accordance with
Overvoltage Category II, Pollution
Degree 2. Category II includes local
level, appliance, portable equipment,
etc., with transient overvoltages less
than Overvoltage Cat. III
17
Maintenance, Recalibration, and Repair
Cleaning and Storage
• The meter should be cleaned with a damp cloth and mild detergent when necessary. Do not use solvents or abrasives.
• Store the meter in an area with moderate temperature
and humidity.
Battery Replacement
1. Remove the one rear Phillips head screw.
2. Open the battery compartment.
3. Replace the old battery with one 9 V battery.
4. Replace the cover and secure the screw.
5. Dispose of the old battery properly.
WARNING: To avoid electric shock, do not operate your meter until the battery door is in place and fastened securely.
18
It is recommended that Digi-Sense products are calibrated annually to ensure proper function and accurate
measurements; however, your quality system or regulatory body may require more frequent calibrations.
To schedule your recalibration, please contact InnoCal, an
ISO 17025 calibration laboratory accredited by A2LA.
Phone: 1-866-INNOCAL (1-866-466-6225) Fax: 1-847-327-2993 E-mail: sales@innocalsolutions.com Web: InnoCalSolutions.com
19
For Product and Ordering Information, Contact:
Toll-Free: 1-800-323-4340 Phone: 1-847-549-7600 Fax: 1-847-247-2929 ColeParmer.com/Digi-Sense
1065DGMAN_20250-55,-56
Toll-Free: 1-800-358-5525 Phone: 1-847-327-2000 Fax: 1-847-327-2700
Davis.com/Digi-Sense
Manual Part No. 00101-90
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