Phone: 253-927-6186
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Microprocessor Controlled Resistance Decade.

ohmSource Microprocessor Controlled Resistance Simulator.
Microprocessor-controlled and loaded with innovative features, the ohmSOURCE Resistance Box
succeeds in providing highly accurate and precise resistance values in an intuitive and user-friendly fashion.

With a resistance value range of up to 24 M and a power rating of up to 1 Watt, the handheld ohmSOURCE is
practical for all industries including automotive, medical, test and measurement, telecommunications,
and HVAC. Using the RS-232 interface and the Software Development Kit, you can control the ohmSOURCE
from a remote computer and design automated test equipment to fit your custom application.

Microprocessor Controlled Resistance Decade.

Model  Description 
ohmSource Microprocessor Controlled Resistance Decade. .

Keypad Interface.
Enter resistance values using a calculator-style keypad instead of unreliable switches and dials.
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 Limiter.
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 (1%, 5%, 10%) Open Key.
Conveniently 100% mechanically isolate the ohmSOURCE from the application with the touch of a key.
Easy-to-Read Display.
The output resistance value, in ohms, is easily read from the large, graphical LCD display.
Automatic Residual Resistance.
The residual resistance of the ohmSOURCE is automatically included in the output resistance value.
Auto-Off Power.
The ohmSOURCE automatically shuts off after 4 minutes of inactivity to conserve power.
RS-232 Interface Capability.
Use the RS-232 interface of your computer to control your ohmSOURCE remotely or to download
sensor translation tables. Software Development Kit required.
Field Calibration.
Easily calibrate the ohmSOURCE with a high precision ohmmeter.
Annual factory calibration recommended.
FLASH Software.
Updates The microprocessor has FLASH program memory to allow reprogramming of product firmware.

ohmSource Resistance Simulator.
Model OS-250  Model OS-260  Model OS-270 
Range  0 to 24,000,000 Ohm  0 to 24,000,000.0 Ohm  0 to 1,500,000.00 Ohm 
Resolution  1 Ohm  0.1 Ohm  0.01 Ohm 
± 1 (up to 1,000 Ohm)
± 0.1% (above 1,000 Ohm)
± 0.5 (up to 1,000.0 Ohm)
 ± 0.1% (above 1,000.0 Ohm) 
± 0.5 (up to 5,000.0 Ohm)
 ± 0.1% (above 5,000.0 Ohm) 
Power Rating  1.0 W  1.0 W  1.0 W 
Power Supply  4 AA alkaline batteries  4 AA alkaline batteries  4 AA alkaline batteries 
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Hotek Technologies, Inc
tel: 253-927-6186