Global Specialties 1522 - Manual - Manual (Page 9)

8 5
SECTION - 6
PART LIST & SCHEMATICS
PCB Components 767E/01 PCB REV-01
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Ref Designator Value
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RESISTORS
R11 NOT USED
R12 1K,1/4W,5%,MFR
R13 NOT USED
R14 1K,1/4W,5%,MFR
R15 1K,1/4W,5%,MFR
R16 0.025E/25W,KYOSH
R17 20K,1/4W,0.1%,MFR
R18 NOT USED
R19 NOT USED
R20 NOT USED
R21 20K,1/4W,0.1%,MFR
R22 20E,1/4W,5%,MFR
R23 20K,1/4W,0.1%,MFR
R24 100K,1/4W,5%,MFR
R25 NOT USED
R26 20K,1/4W,0.1%,MF
R27 100K,1/4W,5%,MFR
R28 10K(12K),1/4W,5%,MFR(SEL-A)
R29 100K,1/4W,5%,MF
R30 33K(91K),1/4W, 5%,MFR(SEL-A)
R31 10K(200K),1/4W,5%,MFR(SEL-V)
R32 1M,1/4W,1%,MFR
R33 10K,1/4W,5%,MFR(SEL-V)
R34 150K(180K),1/4W,5%,MFR(SEL-W)
R35 100K,1/4W,5%,MFR
The instantaneous power consumed by the load. :
w(t) = v(t) * i(t)
where, w(t), v(t) and i(t) are instantaneous values of power,
voltage and current respectively.
The instantanous power waveform is filtered by R32, C11
and buffered by IC17 (TL071). IC18 (TL071) is configured
as a non-inverting amplifier.
The gain is decided by the ratio of R34 and R42. Preset
PR15 (WCAL) is used to set this gain to 2. The DC
voltage at test point TPW2 should be adjusted to 200mV
for a load power of 1000 W.