n. Overload protection.
Up to 1100 volts dc may be applied on any
range. Typical recovery time is 4 seconds.
o. Input power.
115/230 volts ac 10%, 50 to 440 Hz; approximately 3
watts.
p. Operating temperature range. Within all specifications from 15C to
35C. Within all specifications from 0 to 50C except:
Derate by a factor of two -
Maximum Noise and Meter Response Time.
DC Common Mode Rejection -
Derate by 20 db.
-40C to +70C.
q. Storage temperature range.
r. Relative humidity range.
0 to 80%.
s. Weight. 9 pounds.
t. Size.
3.47 in high x 19 in wide x 8.26 in deep.
Learning Event 2:
DESCRIBE OPERATION OF THE 845AR NULL DETECTOR
1.
All operating controls, indicators, and terminals are mounted on the
front panel of the 845AR Null Detector as shown in Figure 4-1, and have the
following functions as described a through g.
Figure 4-1.
Model 845AR High Impedance Voltmeter-Null Detector
a. Meter.
Indicates the voltage applied to the input terminals.
b. Input and common terminals.
Provide connection to voltage being
measured.
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