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Summary of Contents for Harris 9250-05
- Page 1 Model 9250-05 High-Speed Resistance Tester Operators Manual © 2000 HARRIS INSTRUMENT CORPORATION. ALL RIGHTS RESERVED...
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Page 2: Table Of Contents
High-Speed Resistance Tester – Model 9250-05 Operators Manual Section Table of Contents Introduction Product Overview Computer Interface Operational Considerations Manual Conventions Pow er Sw itch Product Specifications Pow er Accuracy Resolution Connections Terminal INPUT Connector Serial Communications Connector Logic Input Connector... -
Page 3: High-Speed Resistance Tester - Model 9250-05
The Model 9250-05 performs a 4½-digit, 4-wire Kelvin-based resistance measurement. The use of a four-terminal resistance measurement system eliminates the inaccuracies introduced by test lead resistance. All functions of the Model 9250-05 are selected and data is returned by commands across the serial communications link. -
Page 4: Computer Interface
Temperature Compensation Probe is available for measuring the temperature of the part under test by the Model 9250-05. The temperature range is 0 - 120ºC with an accuracy of ±2ºC. The temperature is available over the serial communications link. -
Page 5: Operational Considerations
If the lamp does not illuminate, check the power line cord connections to ensure that the unit has power. If the unit does have power and the lamp will still not illuminate, contact Harris Instrument Corporation IRT Service for more information. -
Page 6: Product Specifications
Product Specifications The Model 9250-05 is available with a variety of standard and optional features which allow the unit to meet a wide range of industrial resistance testing requirements. Power Power Supply (rated at 122ºF [50ºC]): 105VAC - 125VAC @ 50Hz - 60Hz, 2.0Amp Maximum, 250Watts Maximum;... -
Page 7: Resolution
Resolution The resolution of the Model 9250-05 is based upon the range of resistance tests being performed. Range Resolution (4½-digit) Range Number None 0 - 0.2 0.00001 0 - 2.0 0.00010 0 - 20.0 0.00100 0 - 200.0 0.01000 0 - 2000.0 0.10000... -
Page 8: Serial Communications Connector
Tab le 4: DB-25 Connector Pinouts LOGIC INPUT Connector Several logic inputs to the Model 9250-05 are available via the 7-pin MS-style female circular connector on the back panel {Figure 7}.These inputs are not currently defined and will be available by custom order in the first quarter of 1998. -
Page 9: Optional Configurations
Low Resistance Testing (availab le first quarter 1998). Tab le 8: Options for Model 9250-05 Accessories Several accessories for the Model 9250-05 are available from Harris Instrument Corporation. Accessory Nam e Circular Mating Connector for INPUT 6-pin MS-Style circular connector (supplied with every Model 9250-05). -
Page 10: Model 9250-05 Commands
Model 9250-05 Commands The Model 9250-05 is controlled by a host computer. A remote LED Display/Keypad is also available and is detailed in the DK Option section of this manual (if applicable). The following commands must be entered in FULL CAPITAL LETTERS, proceeded by an asterisk symbol (*). -
Page 11: Invalid Command Response
Invalid Command Response Any time an invalid command is sent via the serial communications link to the Model 9250-05, the system will respond with a “What?” statement. The following example shows the Set LOW Limit command being used with an improper sequence. -
Page 12: Baud Rate Setting
SHOULD NOT BE RE-CALIBRATED by the operator. This WILL void the certified calibration. Calibration of the Model 9250-05 is performed by placing a calibration standard, near the full scale resistance for each range, across the meter inputs and transmitting a calibration command for the current selected range over the serial communications link. -
Page 13: Line Sync Commands
This command will turn the power line synchronization off. Line SYNC ON is the factory default for the Model 9250-05. Limit Settings High and low limit settings are available with the Model 9250-05. The Set UPPER Limit command sets the high limit and the Set LOWER Limit command sets the low limit. Set UPPER Limit: Enter the UPPER Limit in OHMS, with the appropriate decimal point. -
Page 14: Help Screen
(Range 0) at power up. Stop Readings: When the Model 9250-05 is powered on, the unit is in IDLE Mode. It is taking no readings in this mode. After the Start Readings command or the Send Temperature command are given, the unit 9250-05-Manual.DOC... -
Page 15: Stop Readings
(except Start Readings or Send Temperature) will return the unit to the IDLE Mode. Auto-Range Selection One of the premiere features of the Model 9250-05 is the Auto-Range Selection. The Auto-Range command begins the automatic selection of the resistance range. When the measured resistance falls below 10% of the current range, the meter will automatically switch to the next lower range. -
Page 16: System Operation
Model 9250-05. RX/TX Lamps In the middle of the front panel of the Model 9250-05 are two red lamps labeled RX and TX. These lamps will illuminate when RS-232 communications are in operation. Whenever commands are being received by the Model 9250-05, the RX lamp will illuminate and whenever the unit is transmitting data to the host computer (or LED Display/Keypad Customer Interface –... -
Page 17: Terminal
Save file as 9250.TRM Save As... Click on OK to close the File dialog box. Now, whenever starting Terminal to operate the Model 9250-05, load the file 9250.TRM and the settings for the Model 9250 factory defaults will be available. 9250-05-Manual.DOC 07/19/00 High-Speed Resistance Tester –... -
Page 18: Verify Communications
BEFORE readings should be taken. Also, verify that the RX and TX lamps on the front of the Model 9250-05 are illuminating when the unit is receiving commands (RX) or transmitting data (TX). -
Page 19: Model 9250-05 Calibration
Model 9250-05 Calibration Calibration of the Model 9250-05 is relatively simple as the adjustments to the system are all software-controlled. The following example details the calibration of the unit. NOTE: Any units delivered from the factory with certified calibration SHOULD NOT BE RE-CALIBRATED by the operator. - Page 20 5) Disable Temperature Compensation, if applicable. Command> *J Temperature Compensation is now disabled. 6) Place a 1.9K ±10% resistance standard on the resistance test inputs to the Model 9250-05. 7) Perform the Set Resistance Range command for the 2K range – Range 5. Command> *R5 The unit is now set for testing in the 2K...
- Page 21 14) Enable Temperature Compensation, if applicable. Command> *I Temperature Compensation, if applicable, is now re-enabled. The Model 9250-05 is now calibrated and ready for use. NOTE: The standard resistors should be measured as accurately as possible, usually one more digit of accuracy than the unit will display.
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