Digi-Sense 20250-57, 20250-58 Instruction Manual

THE STANDARD IN PRECISION MEASUREMENT

User Manual

Autoranging Clamp Meters

with NIST-Traceable Calibration

Models 20250-57 (1000 A AC),
20250-58 (1000 A AC/DC, True RMS)

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Introduction

The Digi-Sense Autoranging Clamp Meters (1000 A AC
Model 20250-57; 1000 A AC/DC True RMS Model 20250-58)
offer all the basic features needed for measurement. The
double-molded plastic housing and jaw are designed for
use in tight places. A large backlit display provides easy-to­read 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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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 20250-57

Maximum Input,

Model 20250-58

A 1000 A AC 1000 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) — 60 V DC, 24 V AC

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.

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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 (model 20250-58 only)

4. Carrying case

5. 9 V battery

6. User manual

7. NIST-traceable calibration report with data

Key Features

1. Durable double-molded housing

3

2. 1

⁄16" (30 mm) jaw opening

3. CAT III 600 V safety rating

4. Electronic overload protection

5. Autoranging with auto power-off

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5

Meter Description (Model 20250-57)

60A

600A

A

1

2

9

4

3

6

5

8

7

1. Current clamp

2. Clamp trigger

3. Data HOLD and Backlight button

4. MODE select button

5. RANGE select button

6. LCD

7. COM input jack

8. Rotary function switch

9. Hz% Hold button

10. Max/Min button

11. V Ω

12. Battery compartment (on rear)

•))) Hz jack

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Meter Description (Model 20250-58)

1. Current clamp

2. Clamp trigger

3. Data HOLD and Backlight button

4. MODE select button

5. RANGE select button

6. LCD

7. COM input jack

8. Rotary function switch

9. DC ZERO button

10. Max/Min button

11. V Ω

•))) CAP Hz Temp jack

12. Battery compartment (on rear)

6











6



A

600A

60A

A

A









A


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