Philips PM2522 Manuel D'instructions page 60

66
РМ 2522
IX. Checking and adjusting
The tolerances stated in this section correspond to the factory, data and only apply to a recently
adjusted instrument.
When individual components, especially semi-conductors are replaced, the relevant section
should be completely readjusted.
CALIBRATION AND ADJUSTING PROCEDURE
The table below gives together with Fig. 23 all adjustings and calibrations only to be carried
out if one or more electrical components have been replaced.
No. Adjustments p Preparations Input signals "о Е. |
1 | +5 V Supply R177 к 3 +5 М +0.25 V Jumper "А"-ТРф
2| Clockoscillator R156 - - approx. 8 kHz ТРЗ - TP9**
3| "Zero" Coarse R120 Push V==; 0.2 | Shortcircuited 0.000 V +0.5 mV | TP4- TP9*
R1 "0" midrange
4| "0" Fine КІ Push V ==; 0.2 | Shortcircuited 0.000 V ТР4 - TP9*
5| + VREF = 12 R181 Push V ===; 2 Shortcircuited +3.89 V +10 mV TPS - ТР8*
6 | — VREF = 12 R182 Push V==; 2 Shortcircuited 2292 97% V OVI TP6 - TP7*
7 + VREF R185 R189 midrange Shortcircuited +2.046 У +5 mV TP2 - TP9*
8| — VREF R186 R190 midrange Shortcircuited —2.046 У +5 mV TP1 - TP9*
9| Zero ADC R150 Push V=; 0.2 | Shortcircuited . 0000 digits Display
10| + and - 10 mV== R194 Push V=; 2 Alternately 0.010 digits Display
5010) 5. 1558 + and — 10 mV —0.010 digits
ІЛІП se? М R189 Push М ===; 2 +1.900 V +1 mV +1.900 digits Display
12| -2У-- R190 ign е-е 2 2 Sle SOOM У — 1.900 digits Display
13| Check adj. "9". |f necessary readjust. In case of readjusting, repeat adjustments 10, 11 and 12.
14| 10x amplifier R130 Push V—; 0.2 | +.1900 V +2 mV +.1900 digits Display
15| 20 V == R102 Push У==; 20 +19.00 V +10 mV +19.00 digits Display
16| Zero AC/DC R141 Push Vou; 0.2 | Shortcircuited . 0000 digits Display
17| 2V~ 1kHz R137 Push Va; 2 1.900V = 0.2 mV 1 kHz 1.900 digits Display
18 | 20 V~ 10 kHz C103 Push Va ; 20 19.00 V +20 mV lOkHz| 19.00 digits Display
19| 20 КО R131 Push КО ; 20 19 КЮ +100 19.00 digits Display
"With external voltmeter, e.g. PM 2442
жж . .
With counter ог oscilloscoop