Heathkit IB-5281 - Page 31

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Page 29
INITIAL
TEST
AND
ADJUSTMENTS
The purpose of this section of the Manual is to make
sure your RLC Bridge operates properly and will not
be damaged as a result of a wiring error. A transistor,
for example, could be destroyed instantly by a short
circuit that causes excessive current.
(Inspect the Bridge for improperly soldered
connections, or connections that may be missed
or unsoldered. Also check for solder bridges
across two or more circuit board foils, which
would cause a short circuit.
(.---~ Examine the chassis mounted parts and make
sure they are properly mounted and connected.
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RESISTANCE MEASUREMENTS
NOTE: You will need an ohmmeter to make the fol-
lowing resistance measurements. The readings may
takea few seconds to reach the indicated settings due
to the charging of capacitors in the circuit. If you do
not have an ohmmeter, proceed to ‘“‘Power Supply
Connection.”
(<4 Set your ohmmeter to read R x 100.
( ) Connect the common lead of your ohmmeter to
the chassis.
NOTE: The readings in the following steps, are the
minimum desired. If the readings you get are signifi-
cantly less, you must determine the reason (such as a
short circuit between the foils caused by a solder
bridge) and correct it before you proceed.
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PICTORIAL 4-1
Refer to Pictorial 4-1 for the following steps.
(L-4+ Place the POWER switch to ON.
( ..) Touch the ohmmeter probe to switch SW1 lug
2. The reading should be 5 kO or higher.
(,.).- Touch the ohmmeter probe to switch SW1 lug
5. The reading should be 1 k0 or higher.
(Uj. Place the POWER switch to OFF.
Proceed to ‘‘Power Supply Connection.”