Sencore FE149 - Page 9

to you. Standaway from the unit youare measuring and keep one hand in your pocket
as a safety measure. Ifyou are measuring the high voltage in a color TV receiver,
it is especially dangerous because the high voltage supply (often 30, 000 volts) is
regulated and willnot load down to a safe level if you should accidentally come across
it.
Тһе optional 39A21 High Voltage Probe is used to extend the DC ranges of the FE149
to 50,000 volts. Itcontains a 1, 485 megohm 3% resistor to give а 100 X multiplier
for any range of the FE149. Special ranges of 5KV, 15КУ, and 50KV are marked
right on the front panel. Do not measure voltages higher than 5ОКУ with the 39A21
High Voltage Probe, as the maximum rating of the resistor is 50КУ.
The special high voltage extension for the 39A21 is included with the probe. This
extension simply plugs onto the endof the probe andallows the probe to sneak under
the rubber caps found on the high voltage connection to the CRT in TV receivers.
Special clips are supplied with the 39A21 that will mount on the back of the ЕЕ149
withself tapping screws. These clips will hold the 39A21 High Voltage probe to the
FE149 when not in use. Simply mount the clips with the screws provided in the holes
in the backof the FE149 case. The 39A21 probe willslip in andout of the clips, but
ill not be dislodged from the FE149 when it is transported from job to job.
use the High Voltage probe with the FE149, simply plug the positive test lead
from the FE149 into the handle of the 39A21 where it will engage an internal jack.
Use sufficient pressure when plugging in to insure that complete contact is made.
Connect the ground lead of the FE149 to the unit to be measured, depress the + DC
Volts button ( - DC if you are measuring a negative high voltage) and the range button
of
5KV,
15КУ,
or
50KV
depending
upon
the
voltage
to
be
measured.
To read the actual voltage, multiply the reading on the . 5 volt scale by 10K for the
5KV range, the 1.5 volt scale by 10K for the 15KV range and the .5 volts scale by
100K for the 50KV range.
The
39421
High
Voltage
probe
can
also
be
used
to
measure
voltages
of
50,
150,
500,
or
1000
volts
DC
with
an
input
impedance
of
1,
500
megohms.
То
obtain
this
high
input
impedance,
depress
the
range
button
ОЁ
5,
О
5
от
15
and
measure
the
voltage
using
the
39A21.
Multiply
the
reading
on
the
meter
by
100
to
obtain
the
voltage.
CHECKING THE BATTERIES OF THE ЕЕ149
The 9.6 volt rechargeable battery in the FE149 can readily be checked by merely
depressing the BATT button on the function switch with the FE149 turned on. If the
meter reads inthe green areaon the lower scale of the meter, the batteryis charged
to the proper voltage level and the measurements made with the FE149 will be correct.
If the meter reads below the green area, the battery is low and should be charged
up. To charge up the battery, simply plug the special cord into the FE149 and the
other end into a 105 to 125 volt AC source. The OFF-ON switch must be in the ON
position and the function switch can be in any position except the BATT position. In
this position, the battery is disconnected from the charging source. The battery
will be charging atany time the FE149 is turned on and plugged into the power line.
The charge circuit will limit the current to prevent overcharge of the battery and
any possible damage. The FE149 may be used while the battery charges.
The Ohms battery can be checked by setting the Ohms zero on the RX10 range and
then push ће КХІ range. If the meter indication falls more than half way into the
green "Battery Good" area the ohms battery should be replaced, because readings
on low ohms measurements will not be accurate.
Фф о“ THE BATTERIES IN THE FE149
The batteries are easy to replace inthe FE149. Тһе unit does not have to be removed
from its case. Remove the two screws holding the battery door on the rear of the
case. This will expose the two batteries. Опе, а "ЮО" сеп, is used for ohms measure-
ment and the other, а 9.6 voltrechargeable battery is used to power the circuit. А
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