Simpson Electric 2867, 2868, 2869, 2870 Instruction Manual

2867 and 2868 (DC Measuring)
2869 and 2870 (AC Measuring)

3½ Digit Panel Instruments

INSTRUCTION MANUAL

About this Manual

To the best of our knowledge and at the time written, the information contained in this
document is technically correct and the procedures accurate and adequate to oper­ate this instrument in compliance with its original advertised specifications.

Notes and Safety Information

This Operator’s Manual contains warning headings which alert the user to check for
hazardous conditions. These appear throughout this manual where applicable and
are defined below. To ensure the safety of operating performance of this instrument,
these instructions must be adhered to.

Warning, refer to accompanying documents.

!

Caution, risk of electric shock.

Technical Assistance

SIMPSON ELECTRIC COMPANY offers assistance Monday through Friday
8:00 am to 4:30 pm Central Time. To receive assistance contact Technical Sup­port or Customer Service at [phone].
Internet: http://www.simpsonelectric.com

Warranty and Returns

SIMPSON ELECTRIC COMPANY warrants each instrument and other articles manu­factured by it to be free from defects in material and workmanship under normal use
and service, its obligation under this warranty being limited to making good at its
factory or other article of equipment which shall within one (1) year after delivery of
such instrument or other article of equipment to the original purchaser be returned
intact to it, or to one of its authorized service centers, with transportation charges
prepaid, and which its examination shall disclose to its satisfaction to have been
thus defective; this warranty being expressly in lieu of all other warranties expressed
or implied and of all other obligations or liabilities on its part, and SIMPSON ELEC­TRIC COMPANY neither assumes nor authorizes any other persons to assume for
it any other liability in connection with the sales of its products.

SHOCK HAZARD: As defined in American National Standard, C39.5, Safety
Requirements for Electrical & Electronic Measuring & Controlling Instrumenta­tion, a shock hazard shall be considered to exist at any part involving a potential

in excess of 30 volts RMS (sine wave) or 42.4 volts DC or peak and where a
leakage current from that part to ground exceeds 0.5 milliampere, when mea­sured with an appropriate measuring instrument defined in Section 11.6.1 of
ANSI C39.5.

NOTE: The proper measuring instrument for the measurement of leakage cur­rent consists essentially of a network of a 1500 ohm non-inductive resistor shunted
by a 0.15 microfarad capacitor connected between the terminals of the measur­ing instrument. The leakage current is that portion of the current that flows through
the resistor. The Simpson Model 229-Series 2 AC Leakage Current Tester meets
the ANSI C39.5 requirements for the measurement of AC leakage current and
can be used for this purpose. To measure DC Leakage current, connect a 1500
ohm non-inductive resistor in series with a Simpson 0-500 DC .microammeter
and use this as the measuring instrument.

This warranty shall not apply to any instrument or other article of equipment which
shall have been repaired or altered outside the SIMPSON ELECTRIC COMPANY
factory or authorized service centers, nor which has been subject to misuse, negli­gence or accident, incorrect wiring by others, or installation or use not in accord with
instructions furnished by the manufacturer.

This manual represents your meter as manufactured at the time of publication. It
assumes standard software. Special versions of software may be fitted, in which
case you will be provided with additional details.

The apparatus has been designed and tested in accordance with EN 61010-1, “Safety
Requirments for Electrical Equipment for Measurement, Control and Laboratory Use.”
This operationg guide contains information and warnings that must be followed by
the user to ensure safe operation and to maintain the apparatus in a safe condition.

We reserve the right to make changes and improvements to the product without
obligation to incorporate these changes and improvements into units previously
shipped.

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Contents

1. INTRODUCTION

1. INTRODUCTION ............................................................................... 5

1.1 General .................................................................................................. 5

1.2 Technical Data ....................................................................................... 5

1.3 Theory of Operation ............................................................................... 9

2. INSTALLATION ................................................................................ 10

2.1 Safety Precautions ...............................................................................10

2.2 Panel Mounting Instructions ................................................................ 10

2.3 Power Source Requirements and Connections ..................................11

3. SERVICING INSTRUCTIONS .......................................................... 13

3.1 Case and Front Cover Removal ..........................................................13

3.2 Line Fuse Replacement (2867/2869 only) ..........................................13

1.1 General

Models 2867 through 2870 (hereafter referred to by model number or the Instru­ment) are 3½-digit, panel-mounted instruments. Models 2867 and 2868 provide
visual indication for either DC voltage or DC current measurements, while Mod­els 2869 and 2870 provide measurement of AC voltage or AC current.

The Models 2867 and 2869 can be used as self-contained, panel-mounted units,
operating from either a 120 or 240 volt AC, 50 to 400Hz power source. The
Models 2868 and 2870 are designed to operate from a 5VDC power source.
These Instruments feature solid-state light-emitting diode (LED) display, auto­matic polarity selection and indication, automatic zeroing, excellent temperature
characteristics, high input resistance (for DC voltage models), fast response
time, and automatic out-of-range indication. These Instruments, which provide
high reliability and compact design, use a single Large-Scale-Integration (LSI)
module for the analog-to-digital conversion circuitry.

These Instruments are especially suited for system-oriented application. The
versatility of AC line or DC operation and 200mV full range sensitivity allow each
Instrument to be used as a direct replacement for an analog type instrument. This
feature makes it convenient to convert existing instruments or systems from ana­log to digital display and, at the same time, improve the performance of a system.
Models 2867 and 2868 or Models 2869 and 2870 are each available in nine
configurations, four voltage ranges and five current ranges as shown in Table 1
and Table 2.

NOTE: This Operator’s Manual contains information essential to the operation of
this Instrument. Therefore, keep it in a convenient place and use for reference as
required.

1.2 Technical Data

The following table (Table 1) lists the data for Models 2867 and 2868 Instru­ments. Table 2 lists the data for Models 2869 and 2870.

Table 1-1. Technical Data for Models 2867 and 2868

1. FULL SCALE RANGES:

DC VOLTAGE:

Catalog Numbers

Maximum Input Overload Model Model

Range Indication Resistance Protection 2867 2868

200mV ±199.9mV ⱖ100M⍀ 24620 24640
2V ±1.999V ⱖ100M⍀ 250V 24621 24641
20V ±19.99V ⱖ 10M⍀ All 24622 24642
200V ±199.9V ⱖ 10M⍀ Ranges 24623 24643

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