Digi-Sense 20250-55, 20250-56 Instruction Manual
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)
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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
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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
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Temperature (°C/°F) 250 V AC/DC 250 V AC/DC
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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 difcult 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 specied by the
manufacturer, the protection provided by the equipment
may be impaired.
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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
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• 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)
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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
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