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2867 and 2868 (DC Measuring)
2869 and 2870 (AC Measuring)
3½ Digit Panel Instruments
INSTRUCTION MANUAL
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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 (715) 588-3947.
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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DC CURRENT:
Maximum Catalog Numbers
Maximum Input Overload Model Model
Range Indication Resistance Protection 2867 2868
20µA ±19.99µA 20mA 24624 24644
200µA ±199.9µA 250V 20mA 24625 24645
2mA ±1.999mA All 20mA 24626 24646
20mA ±19.99mA Ranges 100mA 24627 24647
200mA ±199.9mA 1A 24628 24648
2. ACCURACY: ±(0.1% of input + 1 count) at reference
conditions.
3. TEMPERATURE
COEFFICIENT: ±(0.01% of input + 0.05 count) per °C
from 0°C to +55°C.
4. SENSITIVITY: 100µV for 200mV unit: 10nA for 20µA
unit.
5. RESOLUTION: One part in 2000.
6. INPUT BIAS CURRENT: 10pA maximum at reference conditions.
7. FULL RANGE STEP
RESPONSE: 1 second.
(to rated accuracy)
8. NORMAL MODE
REJECTION: 50dB minimum at 60 Hz.
9. COMMON MODE
REJECTION: 90dB minimum (Model 2867 only).
(with 1k⍀ unbalance at 60 Hz)
10. RATED CIRCUIT-TO-GROUND
VOLTAGE*: (MAXIMUM
COMMON MODE VOLTAGE)
Model 2867: 250VDC between either input terminal
and power line ground.
Model 2868: –4.0 to +4.5VDC between the common
(–) input terminal and the power source
common (5VDC return)
*The maximum voltage, with respect to ground, which may safely and con-
tinuously be applied to the circuit of an instrument.
11. CONVERSION
TECHNIQUE RATE: Dual-Slope integration. 3 samples per
second, nominal.
12. DISPLAY TYPE: 7-segment, light-emitting diodes with
0.56" high numerals.
NUMBER OF DIGITS: 3 full digits plus overrange “1” digit.
POLARITY: Automatic, with “–” indication; “+” indica-
tion implied.
OUT-OF-RANGE: All digits blank, except “1” digit lit.
DECIMAL POINT: Jumper selectable.
13. POWER REQUIREMENTS:
Model 2867: 120 or 240VAC ±10%, 50 Hz to 400 Hz,
5VA.
Model 2868: 5VDC, ±5% at 200mA.
14. TEMPERATURE RANGE:
OPERATING: 0°C to +55°C.
STORAGE: –40-°C to +60°C.
15. RELATIVE HUMIDITY: 0 to 85%, non-condensing.
16. REFERENCE CONDITIONS:
TEMPERATURE: 23°C ±2°C.
ATMOSPHERIC
PRESSURE: 575 to 800 mmHg.
RELATIVE HUMIDITY: 30 to 60%
17. WARM-UP TIME: Less than 15 minutes at reference conditions.
Table 1-2. Technical Data for Models 2869 and 2870
1. FULL SCALE RANGES: (Average responding, calibrated for RMS reading of
sine wave.)
AC VOLTAGE:
Catalog Numbers
Maximum Input Overload Model Model
Range Indication Resistance Protection 2869 2870
200mV ±199.9mV ⱖ100M⍀ 24630 24650
2V ±1.999V ⱖ 10M⍀ 250V rms 24631 24651
20V ±19.99V ⱖ 10M⍀ All 24632 24652
200V ±199.9V ⱖ 10M⍀ Ranges 24633 24653
AC CURRENT:
Maximum
Maximum Voltage Input Model Model
Range Indication Drop Current 2869 2870
20µA ±19.99µA 20mA 24634 24654
200µA ±199.9µA 250V rms 20mA 24635 24655
2mA ±1.999mA All 20mA 24636 24656
20mA ±19.99mA Ranges 100mA 24637 24657
200mA ±199.9mA 1A 24638 24658
2. ACCURACY: 45Hz to 1kHz ±(1.0% of input + 5 counts)
at reference conditions.
3. TEMPERATURE
COEFFICIENT: ±(0.1% of input) per °C from 0°C to +
55°C.
4. SENSITIVITY: 100µV for 200 mV unit; 10 nA for 20µA
unit.
Catalog Numbers
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5. RESOLUTION: One part in 2000.
6. INPUT BIAS
CURRENT: 100pA maximum at reference condi-
tions.
7. FULL RANGE STEP
RESPONSE: 3 seconds
(to rated accuracy)
8. CREST FACTOR: Greater than 3:1 at full scale.
9. RATED CIRCUIT-TO-GROUND
VOLTAGE*: (MAXIMUM
COMMON MODE VOLTAGE)
Model 2869: 250VDC between either input terminal
and power line ground.
Model 2870: –4.0 to +4.5VDC between the common
(–) input terminal and the power source
common (5VDC return).
*The maximum voltage, with respect to ground, which may safely and con-
tinuously be applied to the circuit of an instrument.
10. CONVERSION:
TECHNIQUE: Dual-Slope integration.
RATE: 3 samples per second, nominal.
11. DISPLAY:
TYPE: 7-segment, light-emitting diodes with
0.56" high numerals.
NUMBER OF DIGITS: 3 full digits plus overrange “1” digit.
POLARITY: Automatic, with “–” indication; “+” indica-
tion implied.
OUT-OF-RANGE: All digits blank, except “1” digit lit.
DECIMAL POINT: Jumper selectable.
12. POWER REQUIREMENTS:
Model 2869: 120 or 240VAC ±10%, 50 Hz to 400 Hz,
5VA.
Model 2870: 5VDC, ±5% at 200mA.
13. TEMPERATURE RANGE:
OPERATING: 0°C to +55°C.
STORAGE: –40°C to +60°C.
14. RELATIVE HUMIDITY: 0 to 85%, non-condensing.
15. REFERENCE CONDITIONS:
TEMPERATURE: 23°C ±2°C.
ATMOSPHERIC
PRESSURE: 575 to 800 mmHg.
RELATIVE HUMIDITY: 30 to 60%
16. WARM-UP TIME: Less than 15 minutes at reference conditions.
Table 1-3. Items Supplied with the Instrument
QTY. DESCRIPTION PART NUMBER
1 Mounting Bracket 10-863122
1 Operator’s Manual 6-114122
1 Connector, PC Board 22990
Viking Industries — Type 2VK 15 D/1-2-34
US Components — Type UPCR-DIS-CD
Amphenol Corp. — Type 225-21521-101-04
Table 1-4. Optional Mounting Hardware
QTY. DESCRIPTION PART NUMBER
1 Panel Adapter, DIN, IEC 22992
1 Panel Adapter, Domestic Type 22993
1 Mounting Bracket, Rear (DIN, IEC) 22991
1.3 Theory of Operation
The basic block diagram of these Instruments is shown in Figure 1-1. The analogto-digital conversion is accomplished by the Dual-Slope Integration technique. In
Models 2867 and 2868, all A/D conversion circuitry is contained in an LSI integrated circuit. In Models 2869 and 2870, the input signal is first converted from an
AC source into a DC source equivalent before the A/D conversion of the LSI
integrated circuit. These Instruments convert an analog DC voltage or AC voltage
at the input terminals into a corresponding digital value and polarity which are
displayed in numeric form on the 7-segment light-emitting diode (LED) display.
The particular current or voltage range is obtained by connecting the appropriate
attenuator network to the input.
INPUT
INPUT
INPUT SHUNT/
ATTENUATOR
REFERENCE
INPUT SHUNT/
ATTENUATOR
A/D
LSI
Models 2867/2868
AC to DC
CONVERTER
REFERENCE
Models 2869/2870
DISPLAY
Figure 1-1. Block Diagram
LED
A/D
LSI
LED
DISPLAY
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2. INSTALLATION
*3.622"
(92mm)
!
These instruments are designed for maximum safety to the operator when mounted
in a panel according to instructions contained in paragraph 2.2. They are not to be
used unmounted or for exploratory measurements in unknown circuits.
2.1 Safety Precautions
These Instruments do not themselves present a shock hazard, but if connected to
auxiliary line operated equipment, the auxiliary circuits must be properly grounded
for safety and to prevent improper readings. When connecting Models 2867 or
2869 to a power line circuit, make certain that the ground terminal of the PC board
is connected to earth ground as shown in Table 2-1. On Models 2867 through
2870, do not attempt to float the input terminals at more than 250VDC, with
respect to power line (earth) ground. Doing so may damage the Instrument. Before removing the power connector from the Instruments, make certain that the
circuit power sources are de-energized and any capacitors are discharged.
2.2 Panel Mounting Instructions
These Instruments can be mounted on panels ranging from 1/16 to 1/4 inches in
thickness without any modification. To mount the Instrument, proceed as follows:
1. Insert the Instrument through the front panel cut-out.
2. Insert a side-mounting bracket (10-863122) on each side of the Instrument.
Use the two holes near the bezel as shown in Figure 2-1.
3. Slide the brackets toward the rear of the slots until they lock in place.
4. Turn the screws in each bracket until they firmly contact the panel surface.
FRONT PANEL CUT-OUT
PANEL THICKNESS
1/16" to 1/4"
SCREW
SIDE MOUNTING
BRACKET
*±.010"
Figure 2-1. Panel Mounting and Cutout Dimensions
*1.682"
(42.72mm)
FRONT PANEL
CASE
4.27" DEEP
(109mm)
3.9"W
(99mm)
2.3 Power Source Requirements and Connections
Do not attempt to connect the Instruments to a power source until instructed to do
so. Check that the power designation on top of the case agrees with the power
source to be used.
When connecting multiple instruments to a common 5V power source, DO NOT
exceed the Rated Circuit-to-Ground Voltage (Models 2868/2870 only). Refer to
Table 1-1, 1-2.
1.93"H
(49mm)
Do not tighten the screws. Wait until both screws are snug against the panel
surface, then tighten them. Do not over-tighten.
5. Refer to Table 1-1, or Table 1-2 for power requirements. Check that the power
source connector is connected to the correct terminals of the PC board connector. Also, be sure that the power source matches the label on the Instrument case. (Refer to paragraph 2.3 for connector wiring and grounding instructions.)
The 2867/2869 is wired at the factory for 120 volts AC operation (Table 2.1). For
240 volt operation, consult the nearest Authorized Service Center. For proper
operation, be sure that the power line ground connection of the 2867/2869 is
securely connected to a good earth (power line) ground. Preferably, use a standard 3-wire line cord, and a 3-wire grounded outlet that conforms to the latest
electrical code. All power connections are made to the PC board connector. The
power requirement of the 2867/2869 is approximately 5VA. The 2868/2870 is
wired for 5VDC operation, requiring approximately 200mA.
2867/2869 Power Connection: Check that the voltage rating on the label agrees
with the source voltage to be used. Do not apply line power until all signal connections are complete. 2867/2869 power connections are in accordance with
Table 2-1. 2868/2870 power connections (5VDC) are in accordance with Table
2-1. Observe polarity when making these connections.
1110
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Table 2-1.
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1D
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3CNCNC
4CNCDV5+DCNCN
5CNCNE
6CNCNFCNCN
7CNCNH )MOCPD()MOCPD(
8CNCNJ
9CNCNK )3PD()3PD(
01)DLOH/FER–()DLOH/FER–(L)2PD()2PD(
11)FER+()FER+(M)1PD()1PD(
sledoM
9682/7682
tiucriC
NGeriw-dr3CNA DNGeriw-dr3CN
sledoM
0782/8682
tiucriC
niP
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sledoM
9682/7682
tiucriC
,CAV021*
lartueN
,CAV021*
hgiH
D
latigi
nommoC
sledoM
0782-8682
tiucriC
The following servicing instructions are for use by qualified personnel only. To
avoid electrical shock, do not perform any servicing other than that contained in
the operating instructions unless you are qualified to do so.
!
3. SERVICING INSTRUCTIONS
CN
3.1 Case and Front Cover Removal
!
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moClatigiD
nruterCDV5
Remove all power and connections to the Instrument before removing the case or
replacing the fuse.
The case and front cover can be removed for maintenance purposes as follows:
1. Disconnect the Instrument from the AC power source (2867/2869) or turn
power OFF.
2. Remove the two screws that attach the PC connector to the Instrument (when
used) and remove the PC board connector from the rear of the Instrument.
3. Remove the two screws that attach the front cover to the case and pull the PC
board assembly forward out of the case.
3.2 Line Fuse Replacement (2867/2869 only)
21CNCNNCNCN
nI–
31CNCNP
41CNCNRCNCN
51CNCNS tupnI+tupnI+
con"setoneDCN
123456789101112131415
ABC DE FHJ K NPRSLM
POLARIZING KEY
Figure 2-2. Rear Connector Pin Identification
".noitcenno
.noitarepoCAV042rofsnoitcennoclanoitpO*
REAR CONNECTOR
tup
nommoC
.tnemurtsnIrepnoitpoenoylnO:ETON.snoitposetoneD)(
The line fuse is located next to the power transformer.
tupnI–
nommoC
1. Remove the case and front cover as described in paragraph 3.1.
2. Carefully lift the defective fuse from the holder and replace with a 1/8A, 8AG,
normal-blow fuse.
3. Replace the case and front cover.
AVAILABLE UPON REQUEST
Schematic Diagram
Parts Listing
1312
Page 8
NOTES
NOTES
1514
Page 9
SIMPSON ELECTRIC COMPANY 520 Simpson Avenue
Lac du Flambeau, WI 54538-0099 (715) 588-3947 FAX (715) 588-1248
Printed in U.S.A. Part No. 06-114122 Edition 5, 01/07
Visit us on the web at: www.simpsonelectric.com
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