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RCA Volt-Ohm-Milliammeter
Figure 4. DC Ohms Measurement
Ohms Measurement ( See Fig. 4.)
1. Set the Function Switch to the " + D C " position.
2. Set the Range Switch to the appropriate position.
3. P l u g the black test lead into the " — C O M M O N " jack on the control
panel.
4. P l u g the red test lead into the " + " jack on the control panel.
5. Short the test leads together and adjust the Z E R O O H M S control
until the pointer indicates " 0 " (full scale clockwise).
6. Connect the test leads to the resistance to be measured.
7. Reset the Range Switch if necessary to a position which gives a suit-
able pointer deflection. If this is necessary, repeat steps 5 and 6
before proceeding with step 8.
8. Read the resistance from the O H M S scale, and multiply by the range
factor.
C A U T I O N : Low-current, low-resistance devices, such as thermo-
couples and meter movements, may be damaged unless a range above
" R X I " is used, because the W V - 3 8 A applies up to 1.5 volts across the
resistance under measurement when the range selector is set at " R X 1".
To facilitate checking the front-to-back resistance ratio of electrolytic
capacitors and semiconductor devices, the test lead polarity can be reversed
simply by setting the Function Switch to the " — D C " position.
10
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