25
6) Select the most precise reading by downranging the ohmmeter for maximum resolution.
7) Select the 2V clamp. The resistance reading will be indicated on the display.
8) Note the reading on the display and reselect the 20mV clamp.
9) Reverse the polarity switch and reselect the 2V clamp.
10)
Note the reading on the display. The true-ohms value is calculated by averaging the two
noted readings together.
11)
It is recommended that the OPEN-CIRCUIT VOLTAGE selector be placed in the 20mV
position before changing ranges or disconnecting the test leads.
Temperature Compensation
Automatic Temperature Compensation (ATC) simulates a constant ambient temperature chamber
for materials which are normally subject to varying ambient temperatures. When the ATC mode is
selected, the temperature sensor (Options "AL" and "CU") automatically senses the ambient
temperature and adjusts the reading to indicate what the actual resistance value would be in a
controlled 20°C or 25°C environment. The Option "CU" compensator simulates the coefficient of
copper while Option "AL" simulates aluminum.
The ATC mode is selected by pressing the T.C. push-button. The temperature sensors are
connected to the ohmmeter via the front panel BNC connector. The temperature sensor may be may
be placed in closer proximity to the device under test using a Valhalla Option "CK" compensator
extension cable. Selecting the T.C. mode with no sensor connected will yield invalid
measurements.
CAUTION!
The case of the sensor is electrically connected to internal circuitry in the ohmmeter. The
sensor should have no electrical contact with the load under test.
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