Contents
p. 2Applic.
pp. 4-8

Selection
pp. 9-11

LOM-510A Series

GenRadproducts
pp. 50-87

Products
pp. 12-87

Index
p. 89

高確度
High Accuracy
マイクロ・オームメータ
Micro-Ohmmeterp. 1 of 2

豊富な機能とアクセサリーで、非常に小さなFeatures and accessories to assure that very
抵抗値の高確度測定が容易に、しかも経済的
low resistance measurements are accomにできます。
plished accurately, easily, and economically.

1 μΩ resolution

Four measurement modes

0.02% basic accuracy

Auto-zero switched dc mode

Digital output

Probes for chips and traces

HIGH
PERFORMANCE LOW RESISTANCE MEASUREMENT
ハイパフォーマンス低抵抗測定
The LOM-510A has 4½ digits, 0.02% basic
LOM-510Aは4½デジット、基本確度0.02%、
accuracy and 1 μΩ resolution. Its 4-terminal
分解能1μΩのマイクロ・オームメータです。
measurement technique eliminates lead re４端子測定方法によりリードの抵抗誤差を排sistance errors and 80 dB of ac noise rejection
除し、ノイズの多い環境でも80dBのACノイ
provides rock-steady readings even in noisy
ズ除去により安定した測定値が得られます。
locations. The unit comes with rugged 4-termiユニットには丈夫な４端子テストクリップがnal test clips and a large selection of optional
付属していて、プローブ、クリップなど多く
probes, clips and fixtures allowing attachmentの種類のオプションが選択できるのでどんな
to any low-resistance unknown.
未知の低抵抗にも接続できます。

コンスタントDCモード：
Constant dc Mode:
Suitable for measuring the resistance of
コイルやトランスフォーマなどのインダク
inductive components such as coils or transタンス成分の測定に適しています。
formers.

スイッチドDCモード：
Switched dc Mode:
スイッチの接点、接合部、シャント、PC
Allows measurement of switch con tacts,
ボード上の線路、その他の主にレジスタンス
welds, shunts, PC board tracks and other pri成分の測定が出来ます。サーマルEMF効果は
marily resistive elements. Thermal emf effects
除去されます。
are eliminated.

Dry Circuit:
ドライサーキット：
Assures that oxides and film contacts are not
接点の酸化被膜、薄膜を破壊せずに測定でpunctured. The Dry Circuit Mode limits theきます。ドライサーキットモードではオー
open circuit voltage to 50 mV. The Model
プンサーキット電圧を50mVに抑えます。
LOM-510A/20 limits the open circuit voltage
LOM-510A./20モデルの場合はオープンサー
to 20 mV.
キット電圧を20mVに抑えます。

Pulsed Mode:
パルスモード：Provides low drive current to allow meaヒューズ、サーミスタ、その他温度に敏感な
sure ments of fuses, thermistors, and other
素子の測定のために低電流を発生し測定でき
thermally sensitive devices.
ます。

Model LOM-510A Micro-ohmmeter shown with
LOM-501 Standard 4-Terminal Kelvin clips

ポータブル電源、堅牢、更に・・・
PORTABLE
POWER, RUGGED, AND MORE
Portability permits many field applications
携帯型なので多くの現場での低抵抗測定、
such as the measurement of very low resisレールやパイプの接着・溶接部、機体、
tances of rail or pipe bonds, welds, airframes,
モーター、トランスフォーマ、電力配電装
motors, transformers, and power distribution
置等の低抵抗測定の応用に適しています。
apparatus.
The optional Model BP-511 Battery Driven
オプションモデルBP-511、バッテリ駆動のac Power Source will operate the micro-ohmAC電源、を使用すれば内部のパッテリで、
meter from its internal battery for more than
マイクロ・オームメータは連続で最低でもan hour continuously, worst case, and for an
１時間以上働きます。通常の使用法であれindeterminately large number of hoursまwhen
ば何時間もバッテリーは持ちます。
used in normal operation. In addition, the 40
た、40W、120VAC、60Hzの出力を他の小watt, 120 Vac, 60 Hz output can be used to
型機器、携帯ツールが利用することができmake almost any other small instrument orます。
tool portable.

このAC電源BP-511は、オプションのカップ
The BP-511 AC Power Source can be meラーキットLOM-513モデルを使用し、マイchanically attached to the micro-ohmmeter
クロ・オームメータに物理的に装着するこwith the op tion al Model LOM-513 couplerとができます。両方の装置は堅牢な金属
kit, and both units come in heavy-duty metal
ケースに納まります。内蔵のパッテリー
cases. A built-in battery charger is provided
チャージャーにはローバッテリーと充電中
as are LED's to indicate low-battery conditionsの状態を示すLEDが備わっています。詳しくand charger operation. See the BP-511 Battery Driven ac Power Source data sheet.
はバッテリ駆動のAC電源、BP-511データ
シートを参照して下さい。

Model LOM-510A shown with LOM-504
heavy duty Kelvin clips

IET LABS, INC. in the GenRad Tradition
534 Main Street, Westbury, NY 11590
46

www.ietlabs.com
TEL: (516) 334-5959 • (800) 899-8438 • FAX: (516) 334-5988
Electronic cat/LOM p1/02-26-06

Applic.
pp. 4-8

Contents
p. 2Selection
pp. 9-11

LOM-510A Series

GenRadproducts
pp. 50-87

Products
pp. 12-87

高確度
High Accuracy
マイクロ・オームメータ
Micro-OhmmeterIndexp. 89

p. 2 of 2SPEC
IFICATIONS
仕 様LOM-510A MICRO-OHMMETER
マイクロ・オームメータ

Pulsed Mode: One cycle of SW (Switched dc) mode; enabled by
パルスモード:Accuracy:
確度:

shorting two contacts on rear panel connector.
SW(Switched dc)

DC(Continuous dc)

Pulsed Mode

510A

0.02% + 2 counts + 2 μΩ

0.04% + 2 counts + 2 μΩ

0.02% + 4 counts + 2 μΩ

510A/20

0.03% + 3 counts + 2 μΩ

0.05% + 3 counts + 2 μΩ

0.03% + 4 counts + 2 μΩ

Model
LOM-Range(Full Scale)Drive

19.999 mΩ
199.99 mΩ
1.9999 Ω
19.999 Ω
199.99 Ω

1A.1 A
10 mA
1 mA.1 mA

Max Dissipation
DCSW
20 mW
2.0 mW.2 mW.02 mW.002 mW

5.0 mW.50 mW.05 mW.005 mW.0005 mW

Display:
表示: 4½ digit, 0.5 inch, red LED display.

領域外表示:
Display
Overrange Indication: Flashes for DC (Continuous dc) andSW (Switched dc); blanks in Pulsed mode.
Measurement
Rate: 1.5 readings/second.
測定レート:
Connections to Unknown: 4-terminal Kelvin leads with shield.

Resolution
1 μΩ
10 μΩ
100 μΩ
1 mΩ
10 mΩ

Zero Adjust: Active only in DC (Continuous dc) mode.
ゼロ調整:
ノイズ除去:
Noise Rejection: 80 dB for SW (Switched dc) and Pulsed Mode; 60
dB for DC (Continuous dc) mode.
SW(Switched dc) Mode: Current switched on for 166 ms, then off for
スイッチモード:
500 ms (duty cycle = 0.25).

Outputs:
出力: 5 BCD digits for value and polarity; Pulsed Mode Control
lines; power supply lines; 25 pin "D" connector.
Warmup time: 1 minute to rated accuracy.
起動時間:Accuracy
Temperature: Stated accuracy applies over an ambient
確度 対vs.温度temperature range of 18 to 27 °C. Error doubles over the range of 10
to 40 °C.
Accessories
Supplied: LOM-501 test clips.
付属ｱｸｾｻﾘｰ:
Power
電源: Requirements: 105-125 V or 210-250 V, 50-60 Hz, 30 W
max.
Dimensions:
大きさ: 22.9 cm W x 5.1 cm H x 27.9 cm D (9" x 2" x 11")Weight:
重さ: 2.7 kg (6 lb).

ACCESSORIES
アクセサリー
LOM-501 4-Terminal-Kelvin Clips: The Model 501 test clips are fully
insulated and their 1/4 inch jaw openings will accommodate almost anyelectronic component. They have miniature tips for grasping very finewires and other small items. Lead lengthis 1 m (39").
LOM 501A: Same as LOM-501; leads are
2 m (79") long.
LOM-502 4-Ter mi nal Kelvin Clips: Pairof clips, same as Model LOM-501, butunwired.
LOM-504 4-Terminal Heavy-Duty Kelvin Clips: (Shown with ModelLOM-510A Micro-ohmmeter, previous page, center). The Model LOM-504 probe set has 1.9 cm (1.75") jaw openings and 3.7 m (12') leadlengths that permit measurements on large bushings, welded and bolted
joints, rails and pipes, transformers and motors, fuses, power distribution busses or nearly any other large electrical components.
LOM-506 4-Ter mi nal Kelvin Mi cro probes: The Model LOM-506
microprobes permit measurement of chips, circuit board components,and fine conduc tor traces. They also make measurements possible
in ar eas which are in ac ces si ble
to oth er probes, such as in sidea con nec tor. The finely-point ed,
spring-loaded tips are on 1.27 mm(.05") centers. They are made fromhard ened beryllium copper, gold
plated over nickel plate. They arereplaceable

LOM-512 COMPUTERINTERFACE AND LIMITS COMPARATOR
コンピュータインターフェイスとリミットコンパレータ
Serial Output: Allows connection to RS-232C inter face of a computeror a printer. Can be converted to true RS-232C with simple external circuit for applications requiring cable lengths in excess of twelve feet.

Pulse Mode Enable & Trigger Switches: Allow manual operation of
the single measurement mode of operation of Model LOM-510A. Useful for measurements on thermally sensitive components.

Additional TTL-compatible output signals on rear panel connector: Low
Limit Exceeded, High Limit Exceeded, Data Ready.

Power Requirements: Powered by LOM-510A Micro-Ohmmeter.

Input: Trigger measurement - initiates a single measurement cycle,
TTL-compatible, available at rear panel connector.

オーダー情報ORDERING
INFORMATION

Accessories Supplied: Model LOM-512-1 adapter cable.
Dimensions: 22.9 cm W x 5.1 cm H x 27.9 cm D (9" x 2" x 11").
Weight: 2.3 kg (5 lb).

LOM-510A-110
LOM-510A-220
LOM-510/20

Digital Micro-ohmmeter w/LOM-501 test clips; 110 Vac oprtn.
Digital Micro-ohmmeter w/LOM-501 test clips; 220 Vac oprtn.
Digital Micro-ohmmeter, w/20 mV dry circuit option,
and w/LOM-501 test clips

LOM-501A
LOM-502
LOM-503
LOM-504

LOM-530
BP-511

Calibration Kit for LOM 510-A
Battery Pack, AC Source, 115 V, 60 Hz, 40 W (see p.
45)
Computer Interface-Digital Comparator for Model
LOM-510A.
Kelvin Test Clips (pair, length 1 meter)

LOM-506
LOM-506-1
BP-511-1

LOM-512
LOM-501

LOM-512-1
LOM-513

IET LABS, INC. in the GenRad Tradition
534 Main Street, Westbury, NY 11590
Electronic cat/LOMp2/07-08-04

Kelvin Test Clips (pair, length 2 meters)
Kelvin Test Clips, without cable (pair)
Kelvin Test Clips, E-Z Hooks (length 1 meter)
Kelvin Test Clips, Heavy Duty, 2 inch jaws pair, length1 meter)
Kelvin Microprobes (pair, length 1 meter)
Replacement Microprobes, set of 4
Adapter Cable, power, connects LOM-510A to BP511, (supplied with model BP-511)
Adapter cable, data, connects LOM-510A to LOM512, (supplied with model LOM-512)
Coupler Kit (attaches BP-511 or LOM-512 to LOM-

www.ietlabs.com
TEL: (516) 334-5959 • (800) 899-8438 • FAX: (516) 334-5988
47