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i'3~
Turn power "ON" and turn the "ADJUST LINE" control until YOM reads 4.7 VAC .
.
;t~"
Adjust 60-ohm calibrating control (CC) until meter pointer coincides with "ADJUST LINE"
t,
calibration.
.
5:~
Remove YOM test prod tip from terminal 6 of "A" switch and connect to positive
(+)
terminal
t/
of the silicon rectifier. Leave minus (-) YOM prod as is. Set YOM to 3 VDC or higher range.
i.G. Set Model T-65 Function Selector to NPN "L" position.
l.~(
Check to see that meter pointer lines up with "ADJUST LINE" calibration and then depress
"READ METER" button.
, 8. Adjust 500-ohm calibrating control (CB) until YOM reads 1. 75 VDC.
~
9. Repeat Steps 2, 3 and 4 to determine whether the adjustment in Step 8 necessitates a slight
readjustment of the 60-ohm calibrating control (CC) in Step 4.
If
necessary, repeat Steps
4 and 8 until both readings are correct.
C(}\I1PLETE CHECK-OUT PROCEDURE
(Equipment required: 20,000 ohms per volt YOM, PACO Model M-40, PRECISION M')del 110 or
120 or equivalent).
L
With power "OFF", meter pointer should line up with "0" calibration on meter scale.
If
not,'
I.
.
adjust the meter pointer by rotating the screw head on the meter case.
2.~
Turn power "ON" and rotate "ADJUST LINE" control till pointer coincides with "ADJUST
j
.LINE" calibration on meter scale. Meter pointer should be set to "ADJUST LINE" cali
bration for each step unless otherwise noted.
3. Set Function Selector to NPN "SHORT". Clip lead 4 to 2 and depress "READ METER"
I
button. Meter pointer should read 100 on 0-100 scale within ±3 divisions. (NOTE: Should
meter read above 100, reset "ADJUST LINE" control until meter reads 100 and release
"READ METER" button. Meter pointer should now be within 2 divisions of "ADJUST LINE"
calibration on meter scale.)
. 4.
Repeat Step 3 with Function Selector set to PNP "SHORT". Disconnect lead 2, clip lead 4
to lead 1, and repeat Step 3.
5. Set Function Selector to NPN"SHORT" (with leads 1 and 4 only, clipped together) and repeat
Step 3.
6. Remove short between leads 1 and 4. Reset meter pointer to "ADJUST LINE",
if
necessary.
Use an accurate, high-impedance YOM like the PRECISION Model 110 or 120 or PACO
Model M-40. Set YOM to lowest DC voltage range. Clip the
(+)
YOM test prod to
~
of
Model T-65. Clip the (-) YOM test prod to lead 4. Set Model T-65 "A" switch to "1" and
Function Selector to PNP "lebo" position. Depress "READ METER" button. YOM should
read approximately .5 VDC. Release "READ METER" button and set T-65 "A" switch to
position 2. Depress "READ METER" button and read YOM. Repeat this procedure for all
"A" switch positions. DC voltages should be within ± 10% of DC voltages indicated on sche
matic, except possibly for position "1" of "A" switch where larger percentage variations
may occur. Position "18" of "A" switch, will read 0 volts, but time must be allowed for
capacitor to discharge.
7. Reverse YOM test leads. Set Function Selector to "Dr" and take a voltage reading as in
Step 6. Only one voltage reading is needed.
Page 23
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