B&K 281 - Positive Input Terminal (+); Third Readout Digit; Second Readout Digit; First Readout Digit

5:
10.
(+) jack
This is the “hot” input jack. In dc measurements the test lead connected
to this ‘jack is normally applied to the positive potential point in the
circuit under test when FUNCTION switch is in the +DCV position.
NUMERICAL READOUT DIGIT NUMBER 3
An indication between 0 and 9 is obtained, depending upon the value
of the reading displayed. This digit is identified as the "3rd" digit.
NUMERICAL READOUT DIGIT NUMBER 2
A reading of 0 to 9 is obtained, depending upon the value of the
measurement performed. This digit is identified as the "2nd" digit.
NUMERICAL READOUT DIGIT NUMBER 1
Either an off (no display) or a “1” is displayed, depending upon the
value of the measurement performed. This digit is used when readings
corresponding to full scale and over range are performed, and is
identified as the "Ist" digit.
Adjustable Handle
'This handle can be used for carrying the instrument and can also be
used as a tilt stand to raise the front panel to a convenient viewing
angle when desired. The handle can be locked into any desired position
by rotating it until it snaps into the position desired.
PR-21 Test Probe
This probe is used for all measurements performed. This probe is
provided with a selectable 100 КО resistor which is used when perform-
ing dc measurements in high impedance or high frequency circuits.
The resistor isolates the cable and input capacity of the meter from the
circuit in which the measurements are performed. This reduces capaci-
tive loading which may result in erroneous reading.
NOTE
When the probe resistor is used, a reading error of minus (—) one
per cent is introduced because the 100K resistor value is placed in series
with the internal 10 megohm divider. If this error is considered signifi-
cant, the correction is made to the reading obtained by increasing the
value of the observed reading by one per cent.
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