Triplett 630-APL - Operation; Measuring DC Volts

6 ОРЕВАТІОМ
Measuring DC Volts (Fig. 1)
Rotate the selector switch to the appropriate range for
DC volts. Always start with the highest range if in doubt
as to the approximate voltage.
In choosing ranges, endeavor to have the readings fall
in the upper, or right hand, half of the scale for greatest
accuracy.
Plug the black test lead into the COM jack and the red
lead into the У-О-А jack as shown in Figure 1.
CAUTION: When measuring up to 5000 volts set the
selector switch on the 5000/1000 range, plug the red lead
into the jack marked 5000 DCV, and leave the black lead
in COM.
Connect the test prods ACROSS the voltage source. The
red lead is positive. Where polarity is difficult to determine,
the meter may read backwards. No damage will be done if
this occurs. Simply reverse the polarity switch.
The V-Q-A jack will be positive when the polarity switch
is in the “DC+” position.
Read all DC voltages on the top black meter scale.
Notice that the scales are not all marked exactly the same
as the range indicated by the knob position. Thus 0-2.5 volts
is read on the 0-250 scale (i. e. — by 100) on all readings,
the 0-1000 range is read on the 0-10 scale by adding two
zeros, and the 0-5000 range is read on the 0-50 scale by
adding two zeros.
The high sensitivity of 20,000 ohms per volt will allow
you to take measurements in low current circuits such as
grid and discriminator circuits.
Voltages as low ав .005 volts, (.250 volts full scale at 10,000 ohms рег volt)
may be read by using 100 uA DC current range. Simply place the range selector
in the 100 WE position and read the voltage on the 0-250 scale (divide by 1000 for
volts).
CAUTION: For maximum safety do not handle tester or leads when connected
to high voltages. Make certain that no condensers are charged to a high voltage.
NOTE: To measure above 1000 volts, the red lead must be plugged into the
5000 DCV jack and selector switch set on the 5000/1000 DCV range.
For handy operation chart see pages 16 and 17.