IET LABS, INC. in the GenRad Tradition

www.ietlabs.com

TEL: (516) 334-5959 • (800) 899-8438 • FAX: (516) 334-5988

Electronically Controlled

Resistance Box

ohmSOURCE Series

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Model OS-260 Resistance Box

This handheld ohmSOURCE is an

effective option for field applications

in all industries including automo-

tive, medical, test and measure-

ment, and telecommunications.

This microprocessor-controlled,

programmable resistance decade

box provides highly accurate and

stable resistance values. It features

a user-friendly interface, resistances

of up to 24 MΩ, power of up to 1 W,

and two banana-to-alligator cables

for convenient connection. While

remaining cost-effective, the ohm-

SOURCE still offers many advanced

features to ensure that it is practical

for both laboratory and field applica-

tions.

Specifications:

Model OS-260

Model OS-270

Range

0* to 24,000,000.0 W

0* to 1,500,000.00 W

Resolution

0.1 W

0.01 W

Accuracy

£1,000.0 W: ±0.5 W

>1,000.0 W: ±0.1%

£1,000.0 W: ±0.1 W

>1,000.0 W: ±0.01%

Power Rating

1.0 W or 200 Vdc max.

Power Supply

4 AAA alkaline batteries

4 AAA alkaline batteries

*Minimum settable resistance, determined at calibration, is approximately 1 W

OS datasheet/July 2020

Keypad interface:

Enter resistance values using a calculator-

style interface.

Quick-value keys:

Recall up to four frequently used resistance

values with one touch.

Memory keys:

Store resistance values in up to 10 additional

memory locations (0-9).

Current limit (user-defined):

Limits the amount of current passing through

the ohmSOURCE to prevent possible

damage.

Increment value setting:

Change resistance by user-defined

increments or select standard resistance

values.

Open key:

Completely isolate the output terminals with

the touch of a key.

Easy-to-read display:

Large LCD display makes it easy to read the

output.

Automatic residual resistance compensation:

The residual resistance of the ohmSOURCE

is automatically included in the output

resistance value.

No zero-resistance subtraction required.

Auto-off power:

To conserve power, the ohmSOURCE

automatically shuts off after 4 minutes of

inactivity.

Field calibration:

Easily calibrate the ohmSOURCE with a

high-precision ohmmeter. Annual factory

calibration is recommended.

USB interface:

USB interface via USB mini connector for

firmware updates.

OS-91.002 Test leads:

Each ohmSOURCE includes two banana-

plug-to-mini-alligtor-clip leads.

Electrical isolation:

The ohmSOURCE circuit is completely

isolated

Mechanical:

Dimensions:

8.4 cm W x 17.3 cm H x 3.17 cm D

(3.3" W x 6.6" H x 1.25" D)

Weight: 450 g (1 lb)

OS-91.002

Additional Lead Set

OS-270 Resistance Box with Leads Attached

ACCESSORIES