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Chapter 5 Front Panel Controls
General
This chapter outlines the use of each of the front panel controls and connectors. This chapter should be
used in conjunction with Chapter 6 and 7 for complete operating instructions.
Power Switch
This "push-push" switch is used to alternately apply or disconnect the AC power source from the
internal circuitry of the product.
Range Switches
These switches are used to select the required resistance range. The switches are interlocked such that
only one switch may be selected (depressed) at any one time. Use the range and resolution tables of
Chapter 3 to determine which range will provide the greatest accuracy without exceeding its limit.
CAUTION!
Extra care must be taken when working with inductive loads. Always select the highest
resistance range before connecting or disconnecting the test leads.
STD / T.C. Switches
These paragraphs apply only to Models 4100ATC and 4150ATC. These switches are used to select
(T.C.) or deselect (STD) the temperature compensating mode of operation. These switches are
interlocked such that only one may be depressed at any one time.
This switch should be left in the STD position unless a compensating sensor (Option CU or AL) is
attached to the TEMPERATURE COMPENSATOR jack. Depress the T.C. switch to select the
compensator. Selection of the ATC mode of operation when no sensor is fitted will yield invalid
measurements.
Temperature Compensation Connector
These paragraphs apply only to Models 4100ATC and 4150ATC. This BNC connector may be
connected to a temperature sensor (e.g., option "CU" or "AL") for operation of these products in the
T.C. mode via up to 48" of RG58CU cable (Valhalla Option CK). This sensor simulates a constant
temperature chamber and will accurately monitor the ambient temperature and correct the displayed
reading to give the value at the reference temperature of the sensor.
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