9250-05-Manual.DOC
07/19/00
High-Speed Resistance Tester – Model 9250-05
Operators Manual
2
Introduction
The Harris Instrument Corporation High-Speed Resistance Tester – Model 9250-05 is designed
for high-volume testing of the resistance of the parts and components manufactured in industrial
environments. It is a high-resolution ohmmeter that couples laboratory precision with the durability
and speed required by industry.
Utilizing a powerful digital signal processor (DSP) micro-controller, the Model 9250-05 is capable
of 250 readings per second over a serial communications link (RS-232) or via a remote LED
Display/Keypad Customer interface (DK Option). The Model 9250-05 responds to a variety of
ASCII commands and includes a help screen for operator assistance. The resistance tester
requires connection to a host computer or any device capable of transmitting commands via RS-
232. Calibration is software controlled.
Product Overview
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.
The measurement ranges are selectable via instructions from the host computer (or optional LED
Display/Keypad Customer Interface). Resistance ranges of 0.20000
, 2.0000
, 20.000
,
200.00
, and 2,000.0
are available and can be operator selectable or can be set up for auto-
range selection. Auto-ranging selects the range when the resistance falls below 10% of the
current range and automatically switches to the lower range. A lighted ON/OFF push-button
switch is mounted on the front panel of the unit, along with two red LED lamps that indicate when
the serial communications link is functioning.
Figure 1: Typical Model 9250-05 Front Panel
Figure 2: Typical Model 9250-05 Back Panel
