Atec AEMC-DTR-8500 User Manual

Digital Transformer Ratiometer DTR®Model 8500 (pdf) 08/02

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The DTR®Model 8500 from AEMC

®

Instruments is a portable digital trans­former ratiometer designed for on-site
testing of power, potential and current
transformers. When connected to a
non-energized transformer, the DTR

®

Model 8500 accurately measures
primary to secondary turns ratio, while
simultaneously displaying polarity
and excitation current.

The DTR

®

is fully automatic and uses
an ANSI/IEEE compliant test method.
No user calibration, range selection,
hand cranking or tedious balancing
is required. At each measurement,
the DTR

®

automatically self-calibrates
and checks for open windings/
connections/ circuit breakers, short
circuits (excess excitation current),

incorrect test lead placement, and
reverse polarity. Measurements are
displayed quickly and accurately.

The DTR

®

Model 8500 is designed
with operator safety in mind. Tests
are performed at low voltage and,
unlike other ratiometers, step-down
excitation is employed. This method,
in conjunction with an integral H/X
reverse protection circuit, guards
against the generation of hazardous
test voltages normally associated
with transformer ratio measurement
instruments.

A large, dual line alpha-numeric LCD
display with adjustable contrast and
backlight guarantees day/night read­ability. Power is supplied by integral

NiCD battery (included) or by AC line.
Batteries are charged automatically
during AC operation.

Both rugged and reliable, the DTR

®

Model 8500 is built into an attractive,
sealed structural polypropylene case
designed to withstand the rigors of
utility and industrial field use.

Constructed using only the highest
quality electrical and mechanical
components, the DTR

®

Model 8500
sets the standard in advanced design,
engineering and workmanship, and it
will provide the user with years of
accurate and reliable measurements.

Digital Transformer Ratiometer
DTR

®

Model 8500

Digital Transformer Ratiometer DTR®Model 8500 (pdf) 08/02

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Features

• Designed for Power Transformers,
VTs, PTs and CTs

• Direct readings from 0.8000:1 to

1500.0:1

• Display Turns Ratio, Polarity and
Excitation Current simultaneously

• Dual power supply and operation:
integrated rechargeable NiCD
battery and AC supply

• Display warnings of incorrect lead
connections, reverse polarity, open
and short circuits

• Easy connection and test setup: no
calibration or balancing required

• Large dual line display with
adjustable contrast and backlight
ensures clear day/night visibility

• Low battery indicator

• Includes 15 ft leads

Applications

• Power transformers

• Potential transformers

•

Current transformers

In the shop or in the field — easy to connect and operate as shown on this
37 KVA transformer (left) and this 3 phase 2000 KVAtransformer.

CT Ratio Measurement

Digital Transformer Ratiometer DTR®Model 8500 (pdf) 08/02

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MODEL DTR®8500

ELECTRICAL

Ratio Range Auto-Ranging, 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: 0 to 1A Auto Level, 0.1 to 5Vrms

Excitation Current Display Range: 0 to 1000mA; Accuracy: ±2% of Reading ± 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 Source 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 115 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

Displayed Measurements Turns ratio; RMS excitation current; polarity
Displayed Messages Incorrect lead connections; H/X reversal (accidental step-up misconnection);

Short (excess excitation current); Open circuits; Circuit continuity & low battery

MECHANICAL

Connections Cannon®XLR connectors and large color-coded industrial clips
Leads 15 ft, H x X color-coded, in carrying bag
Display Dual line alpha-numeric 3.875 x 0.875" with contrast adjustment and backlight
Operating Temperature 32° to 122°F (0° to 50°C), 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)

Specifications

Simple concise operation - clear informative data displays

Selected mode indication Automatically self-calibrates with every use Continuity test option selected

Indicates possible shorts in windings Automatically detects and displays improper

cable connections

Displays ratio and excitation current

Digital Transformer Ratiometer DTR®Model 8500 (pdf) 08/02

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ORDERING INFORMATION CATALOG NO.

Digital Transformer Ratiometer DTR®Model 8500 (factory preset 115V, 50/60Hz Input) . . . . . . . . . . . . . . . . . . . Cat. #2111.80

Includes user manual, AC line cord, test lead set (15 ft) in a carrying bag

Digital Transformer Ratiometer DTR

®

Model 8500 (factory preset 230V, 50/60Hz Input) . . . . . . . . . . . . . . . . . . . Cat. #2116.21

Includes user manual, power cord with stripped end (no plug) receptacle, test lead set (15 ft) in a carrying bag

Accessories

Test lead set (30 ft) in carrying bag . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Cat. #2118.47

Replacement set of test leads (15 ft). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Cat. #2118.48

Construction

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)

Test lead set (30 ft) in

a soft carrying bag

Catalog #2118.47

Digital Transformer Ratiometer DTR®Model 8500 (pdf) 08/02

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Contact Us

United States & Canada:

Chauvin Arnoux

®

, Inc.

d.b.a. AEMC

®

Instruments
200 Foxborough Blvd.
Foxborough, MA 02035 USA
[phone] • Fax [phone]
www.aemc.com

Customer Support – for placing an order, obtaining price & delivery:

[e-mail]

Sales Department – for general sales information:

[e-mail]

Repair and Calibration Service – for information on repair & calibration, obtaining a user manual:

[e-mail]

Technical and Product Application Support – for technical and application support:

[e-mail]

Webmaster – for information regarding www.aemc.com:

[e-mail]

South America, Central America, Mexico, Caribbean, Australia & New Zealand:

Chauvin Arnoux

®

, Inc.

d.b.a. AEMC

®

Instruments
15 Faraday Drive
Dover, NH 03820 USA
[phone] • Fax [phone]
[e-mail]
www.aemc.com

All other countries:

Chauvin Arnoux SCA
190, rue Championnet
75876 Paris Cedex 18, France
33 1 44 85 45 28 • Fax [phone]
[e-mail]
www.chauvin-arnoux.com