If we measure output to gnd resistance for this device on an open circuit, may we know what is expected resistance range is?
Hoping for your inputs.
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As this is an old National Semiconductor part, I do not have access to design documents. The feedback resistors could probably be measured using a small voltage (less than ~200 - 300mV) applied at the output. If the voltage is near a diode drop, the body diode of the BJT will start conducting current and throw off the measurement. Additionally, if a negative voltage is applied from OUT to GND, it is a similar story because there are likely ESD diodes that will begin conducting if the voltage applied is close to a diode drop.