HP 202A - Page 46

Model 202A - Page 2
ERRATA :
Section IV-13 FREQUENCY RATIO AND CALIBRATION PROCEDURE
Step
8) Check calibration of the "Xl" range, The output
frequency should be within
22% of the dial read-
ing over the entire range. Adjust
R26B if neces-
sary.
Step
9) Check the calibration of the other ranges, Adjust
R24B for the "X.01" range, R25B for the "X,ltl range,
R27B for the "X10" range and R28B for the "X100"
range.
On the "X100" range only, adjust C33 to calibrate
the high end of the band,
Serial
6800 and above; also Serials 6411, 6747, 6750, 6751,
67529 67539 67549 67559 6756, 67579 6758:
C1,2: Change to capacitor, fixed, electrolytic, 20uf,
450 vdcw; -hp- Stock No, 18-20HP, Mfr., CC
Add capacitor, fixed, electrolytic, 2 sections,
--
20uf/sect, 450 vdcw; -hp- Stock No, 18-22HP, Mfr,, CC
R120
thru
- Add resistor, fixed, composition, 150,000 ohms
R123 : - +lo%, 2 W; -hp- Stock No. 25-150K, Mfro, B
See partial schematic below: