Heathkit C 2 Service Manual

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ASSEMBLING AND
USING YOUR

l/fllt/Lkit

Condenser Checker
Model C-2

®

THE HEATH COMPANY
BENTON HARBOR. MICHé;

PRICE $1 .00 '

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HEATHKIT

CONDENSER CHECKER

MODEL C-2

For electrolytic conden-
sers turn both controls to

Read power factor on
small scale. .......

get largest opening of eye.

Turn this knob to balance
the bridge as shown by

the magic eye tube. . . . .

Main dial reads directly
resistance or capacity in
the range selected. . . .' .

Slide switch turns instru-
ment on and off .......

Fully opened eye (maxi-
mum shadow) indicates
bridge balance .......

Neon bulb shows leaky
condensers by flashing or
a steady glow .......

Set the control fully coun~
terclockwise to test paper
mica and ceramic con-
densers. Turn clockwise
to check electrolytic con-
denser.

Selector switch gives
0 hoic e of two resistance
ranges, four capacity
ranges and five polarizing
voltages for leakage test.

Connect- unknown conden-
ser to be tested between
these contacts .......

Connect unknown resistor
to be tested between these
contacts ..........

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A 10 Meg resistor (C10) to pin #8 (S) and pin #5 (NS) on 1629 socket. A 1 Meg resistor (017)
to pin #4 (S) and pin #3 (S) on socket 1629 . A .01 MFD condenser (T13) to pin #5 (S) and to
pin #1 (S) on 1629 socket. '

12. A wire to lug nearest selector switch on dual terminal strip (NS) andto terminal of main con-
trol nearest selector switch (NS). A wire to terminal of main control (S) and to banana jack
(S) nearest selector switch. A 2K-1W precision resistor (C42) to contact #1 on rear deck of
selector switch (S), andto nearest lug on dual terminal strip (NS). A 200K precision resistor
(V64) to contact #2 on rear deck of selector switch (S), and to nearest lug on dual terminal
strip (NS)

13. Temporarily connect the green leads from the transformer (do not shorten yet) one lead .to
contact #10 on rear deck of selector switch (S), other lead to lug nearest selector switch on
dual terminal strip (S). (These leads may have to be inter-changed as determined by the
initial test.) Placethe line cord (0'78) through the rubber grommet in the chassis, tie a strain
relief knot on the inside and connect one lead to nearest lug on dual terminal strip (S), other
lead to a lug on the slide switch (S).

INITIAL TE ST

Check the wiring carefully. We suggest following each wire and tracing over the corresponding
wire on the pictorial diagram with a colored pencil. Check each solder connection.

Plug the unit into a 117 volt 50/60 eyele AC outlet ONLY. This unit will not operate and serious
damage will result if connected to DC. Turn unit on and allow a minute for warm up. The tuning
eye should light up to a bright green.

Set selector switch to the high resistance range (Rx 100) and connect the calibrating resistor to
the Res jacks. Adjust the main control so that the eye opens. Set pointer to indicate the re-
sistance of the calibrating resistance, and tighten the set screw. The pointer travel should now
be practically the full length of the dial scale.

Set selector switch to the lowest capacity range. Without test leads inserted into the banana jacks,
check to determine if a null can be obtained at the low end of the scale.

Note the capacity indicated at balance. This small value (5-30 MMF) is the inherent minumum
capacity. When making accurate capacity measurements on the lowest range, subtract this value
from the indicated value. If null is not obtained, reverse green transformer leads. For greatest
accuracy on this lowest range, insert the leads of the condenser directly into the banana jacks.
This will eliminate errors caused by the test leads. 7»

14. Properly connect the green transformer leads. Prepare the cabinet by installing the handle
(079) with two 10-24 screws, and pushing the rubber feet in the bottom holes. Install the in-
strument in the cabinet with six #6 sheet metal screws. This completes the instrument.

OPERATION OF THE HEATHKIT
MODEL C-2
CONDENSER CHECKER

The resistance bridge Operates on AC of the line frequency. The bridge consists of the ratio arms
formed by the main control, one of two standard resistors (C42 or V64) and the unknown. Connect
the unknown to the jacks marked RES. Set the selector switch toRor R x. 100 range and adjust
main control for maximum shadow of the tuning eye. Read resistance on main dial and add two
zero 5 if R x 100 rangelis used.

The capacity bridge operates on AC of the line frequency. The bridge consists of the ratio arms
formed by the main control, one of three standard condensers and the unknown. Connect the un-
known to the jacks marked CAP. Set the selector switch to the proper range and adjustmain
control for maximum shadow of the tuning eye. Read capacitance on main dial considering the
position of theselector switch.

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