Output

The output system comprises a 0—5 milliampere panel meter and a pair of terminals in series with the meter. The panel meter has two scales calibrated in volts and two scales calibrated in ohms so that both have two ranges per decade. Any external meter or recorder at the output terminals can have as much as 1500 ohms resistance without affecting performance. Thus, either the 5 ma or the 1 ma Esterline-Angus recorder can be connected to obtain permanent recordings of results. The amplifier is an ideal companion instru-

INPUT

INPUT

GROUND

Figure 6. The I, R, and E terminals add appreciably to the versatility of the instrument. Any one of the three terminals can be used as a guard point (as in 3-terminal resistance measurements) and can be grounded by a panel switch.

GROUND

Figure 6. The I, R, and E terminals add appreciably to the versatility of the instrument. Any one of the three terminals can be used as a guard point (as in 3-terminal resistance measurements) and can be grounded by a panel switch.

ment to this Graphic Recorder since it can be mounted in the same type of case. The dynamic output resistance of the amplifier is but a fraction of an ohm ; therefore, it is well adapted for operation with most recorders.

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