AEMC 8500 User manual

DIGITAL TRANSFORMER
RATIOMETER
MEDIDOR DE RAZÓN DE
TRANSFORMADOR DIGITAL
ENGLISH User Manual
ESPAÑOL Manual de Instrucciones
8500
TRANSFORMER RATIOMETER
MODEL 8500
H
X
POWER
CONTRAST
CHARGING
TEST
!
!
®
INSTRUMENTS

Statement of Compliance
Chauvin Arnoux®, Inc. d.b.a. AEMC®Instruments
certifies that this instrument has been calibrated
using standards and instruments traceable to
international standards.
We guarantee that at the time of shipping your
instrument has met its published specifications.
An NIST traceable certificate may be
requested at the time of purchase, or obtained
by returning the instrument to our repair and
calibration facility, for a nominal charge.
The recommended calibration interval for this
instrument is 12 months and begins on the date of
receipt by the customer. For recalibration, please
use our calibration services. Refer to our repair
and calibration section at www.aemc.com.
Serial #: ________________________________
Catalog #: 2111.80 / 2116.21
Model #: 8500 (115V) / 8500 (230V)
Please fill in the appropriate date as indicated:
Date Received: _________________________________
Date Calibration Due: _______________________
Chauvin Arnoux®, Inc.
d.b.a AEMC®Instruments
www.aemc.com

Digital Transformer Ratiometer DTR
®
Model 8500 1
Table of Contents
1. INTRODUCTION............................................................................... 3
1.1 International Electrical Symbols................................................3
1.2 Receiving Your Shipment..........................................................4
1.3 Ordering Information.................................................................4
1.3.1 Accessories and Replacement Parts............................4
2. PRODUCT FEATURES ...................................................................... 5
2.1 Description................................................................................5
2.2 Control Features.......................................................................6
3. SPECIFICATIONS............................................................................. 7
3.1 Electrical ...................................................................................7
3.2 Mechanical................................................................................8
3.3 CableIdentication ...................................................................8
4. OPERATION .................................................................................... 9
4.1 Conducting a Test .....................................................................9
4.2 Mode Selection.........................................................................9
4.3 VT/PT......................................................................................10
4.3.1 VT/PT Example Connections......................................10
4.3.2 VT/PT Testing .............................................................11
4.3.3 VT Test Mode Flow Chart ...........................................12
4.3.4 VT/PT Excitation Current ............................................13
4.3.5 VT/PT Continuity Test .................................................13
4.4 CT...........................................................................................14
4.4.1 CT Example Connections ...........................................14
4.4.2 CT Testing...................................................................14
4.4.3 CT Test Mode Flow Chart ...........................................15
4.5 Displayed Messages...............................................................16
4.6 Power Supply..........................................................................17
4.7 Changing Power Supply Setting from
115V to 230V or 230V to 115V ...............................................18
4.8 Tips for Making Precise Ratio Measurements ........................19
ENGLISH ................................................................................................... 1
ESPAÑOL................................................................................................. 25

2 Digital Transformer Ratiometer DTR
®
Model 8500
4.9 Ratio Test - 1:1 .......................................................................19
4.10 Polyphase Connections..........................................................20
5. MAINTENANCE ............................................................................. 21
Repair and Calibration
(North/South America, Australia, New Zealand) .............................22
Technical and Sales Assistance
(North/South America, Australia, New Zealand) .............................22
Repair and Calibration
(Europe, Asia, Africa) ......................................................................23
Technical and Sales Assistance
(Europe, Asia, Africa) ......................................................................23
Limited Warranty.............................................................................24
Warranty Repairs ............................................................................24

Digital Transformer Ratiometer DTR
®
Model 8500 3
CHAPTER 1
INTRODUCTION
WARNING
These safety warnings are provided to ensure the safety of personnel
and proper operation of the instrument.
• Readtheinstructionmanualcompletelyandfollowallsafetyinfor-
mation before attempting to use or service this instrument.
• TheDigitalTransformerRatiometerDTR®Model 8500 is designed
for use on non-energized (“dead”) transformers only. Make sure
the test sample is completely disconnected from AC power and is
fully discharged.
• OnlyqualiedpersonnelshouldusetheModel8500.
• TheDTR®must not be used in a manner in which any of its com-
ponents (including test cables) are relied upon to provide protec-
tion from electric shock. No high voltage insulation/protection is
provided by any component of the DTR®. Always make sure the
circuit is fully discharged before attaching any test cables.
• Donottouch,adjust,orrepositiontestcableswhiletheDTR®is
conducting a test.
• Usecautiononanyapparatus:potentiallyhighvoltagesandcur-
rents may be present and pose a shock hazard.
• Safetyistheresponsibilityoftheuser.
• NeveropentheinstrumentwhileitisconnectedtoACpoweror
when test cables are connected to transformers, equipment,
circuits, etc.
1.1 International Electrical Symbols
Thissymbolsigniesthattheinstrumentisprotectedbydoubleor
reinforcedinsulation.Useonlyspeciedreplacementpartswhen
servicing the instrument.
This symbol on the instrument indicates a WARNING and that
the operator must refer to the user manual for instructions before
operating the instrument.
Risk of electric shock. The voltage at the parts marked with this
symbol may be dangerous.

4 Digital Transformer Ratiometer DTR
®
Model 8500
1.2 Receiving Your Shipment
Uponreceivingyourshipment,makesurethatthecontentsareconsis-
tent with the packing list. Notify your distributor of any missing items. If
theequipmentappearstobedamaged,leaclaimimmediatelywiththe
carrier and notify your distributor at once, giving a detailed description of
any damage. Save the damaged packing container to substantiate your
claim.
1.3 Ordering Information
Digital Transformer Ratiometer Model 8500 (115V)........ Cat. #2111.80
Includes ratiometer - factory preset 115V, 50/60Hz input, NiCd batteries (installed), 115V
power cord, set of 15 ft cables in a carrying bag, warranty card and user manual.
Digital Transformer Ratiometer Model 8500 (230V)........ Cat. #2116.21
Includes ratiometer - factory preset 230V, 50/60Hz input, NiCd batteries (installed), power
cord with stripped end (no receptacle plug), set of 15 ft cables in a carrying bag, warranty
card and user manual.
1.3.1 Accessories and Replacement Parts
Test lead set (30 ft) in carrying bag ..................................... Cat. #2118.47
Replacement set of test leads (15 ft)................................... Cat. #2118.48
Replacement 12V NiCd batteries, set of two....................... Cat. #2118.57
Fuse,setof5,0.5A,≥250V................................................. Cat. #2118.53
(5 x 20mm, slow acting, for 230V power input and main board)
Fuse,setof5,1A,≥125V.................................................... Cat. #2118.54
(5 x 20mm, slow acting, for 115V unit only)
Fuse,setof5,4A,≥125V.................................................... Cat. #2118.55
(5 x 20mm, slow acting)
Order Accessories and Replacement Parts Directly Online
Check our Storefront at www.aemc.com for availability

Digital Transformer Ratiometer DTR
®
Model 8500 5
CHAPTER 2
PRODUCT FEATURES
2.1 Description
The DTR®Model 8500 is a lightweight, rugged, portable digital transformer
ratiometer designed for onsite testing of power, potential and current trans-
formers. Operation of the Model 8500 is fully automatic. No user calibra-
tion,rangeselection,handcrankingortediousbalancingisrequired.
During each test cycle, the DTR®automatically checks for:
• H/Xleadreversal
• Continuityoftestedcircuits/windings
• Shortcircuitconditions(highcurrent)
Uponcompletionofatestcycle,theDTR®displays:
• Turns Ratio - the ratio of the primary to secondary voltage at the
transformer terminals due to test excitation
• Excitation Current - the RMS excitation current in the H winding
duetotestexcitationduringnegligibleloadingoftheassociatedX
winding
• Polarity-indicatesthepolarity(phase)ofXrelativetoH
Turns Ratio, Excitation Current and Polarity are useful parameters in diag-
nosing and predicting a variety of faults that occur in power, potential and
current transformers.
The Model 8500 will display the following messages:
• IncorrectLeadConnections
• H/XReversal(accidentalstep-upmisconnection)
• Short(excessexcitationcurrent)
• OpenCircuits
• CircuitContinuity
• LowBattery
The DTR®utilizes an advanced, low-voltage, step-down measurement
technique in which the high voltage “H” winding is subjected to test
excitation. This results in greater operator safety and the ability to test
a much wider array of transformer types and sizes.

6 Digital Transformer Ratiometer DTR
®
Model 8500
2.2 Control Features
TRANSFORMER RATIOMETER
MODEL 8500
X
H
CHARGING
CONTRAST
TEST
POWER
!
!
R
1 2
8
9
3
4
5
6
7
1. Display
2. BatteryChargeIndicator
3. AC Power Inlet
4. Line Fuse Tray
5. DisplayContrastAdjustment
6. TEST Push button
7. Main Power Switch
8. Low-side“X”cableconnector(secondary)
9. High-side“H”cableconnector(primary)

Digital Transformer Ratiometer DTR
®
Model 8500 7
CHAPTER 3
SPECIFICATIONS
3.1 Electrical
Ratio Range:
Autoranging, 0.8000 to 1500.0:1
Accuracy*: Ratio < 10 to 1: ± 0.2% of Reading
Ratio ≤10 to 1000 to 1: ± 0.1% of Reading
Ratio > 1000 to 1: ± 0.2% of Reading
Excitation Signal: PT/VT Mode: 44Vrms maximum
CT Mode: Auto Level 0 to 1A, 0.1 to 5Vrms
Excitation Current Display: Range: 0 to 1000mA
Accuracy: 2% R ± 2mA
Excitation Frequency: 70Hz
Display:
LCD Character, 20 x 2, large format, LED backlight, day/night visible
Measurement Method: In accordance with ANSI/IEEE C57.12.90
Power Supply:
Dual operation; rechargeable NiCd battery & 115/230V, 50/60Hz line
supply. DTR®may be changed from 115/230V by internal switch at any
time.Unitsavailablewithfactorypresettingof115Vor230V.
Batteries:
12V,5x2NiCdpacks,1300mAH,PanasonicP-130SCRorequivalent
Battery Life:
Upto10hrs.continuousoperation.
May be used while recharging. Low battery LCD indication.
Charging Time: 14 hrs typical, C/10 rate
Line Fuse: 115V: 1.0A, 5 x 20mm, slow acting
230V: 0.5A, 5 x 20mm, slow acting
* 23°C ± 5°C, 50 to 70% RH, full battery charge, no external elds or noise.

8 Digital Transformer Ratiometer DTR
®
Model 8500
3.2 Mechanical
Connections: Cannon®XLRconnectors&largecolor-codedindustrialclips
Leads:15ft,H&Xcolor-coded,incarryingbag
Display:Duallinealpha-numeric3.875x.875"withcontrastadjustment
and backlight
Operating Temperature: 0° to 50°C (32° to 122°F)
0 to 90% RH (without condensation)
Case: Heavy duty structural polypropylene (yellow)
Dimensions: 13 x 12 x 6" (330 x 305 x 152mm)
Weight: 14 lb (6.4kg)
*All specications are subject to change without notice
3.3 Cable Identification
H H HH H H
H CABLE SET
RED BOOT
BLACK BOOT
"H" IDENTIFIER
5 PIN
CONNECTOR
"H" IDENTIFIER
X X XX X X
X CABLE SET
RED BOOT
BLACK BOOT
"X" IDENTIFIER
3 PIN
CONNECTOR
"X" IDENTIFIER