HP 212A - Page 20

3.
Set PULSE LENGTHdial to .1.
4.
If necessary, adjust RL43 to obtain a pulse length of . 1 microsecond.
5.
Check accuracy of other points on dial.
The dial may be slipped on
the shaft and the above adjustments refined for greatest overall ac -
curacy.
6.
I£ unable to bring close enough, particularly following replacement
of R142, recalibration of a new dial will be required.
Pulse Rate Calibration -- The PULSE RATE dial is used only for ap -
proximate setting of the repetition frequency and its calibration is not
meant to have high accuracy. Adjust as follows:
1.
With the equipment operating set SYNC SELECTOR switch to the XI0
position and the PULSE UTE dial to maximum clockwise position.
2. Adjust R124 toobtainapdse rate of 5000 to 5200pps.
3.
With PULSE RATE control unchanged set SYNC SELECTOR switch
to the Xl position.
4.
Adjust R121 to obtain a pulse rate of 520 pps.
The settings of R124
and R121 are interdependent. Steps 2 and 4 must be repeated until
the desired maxirriurn pulse rates are obtained on both the X1 and
X10 ranges.
5.
Set PULSE RATE dial and SYNC SELECTOR switch to obtain a re -
petition rate of 1000 pps. Loosen set screw in dial and set to read
lrlOO1l. Tighten set screw lightly.
6,
Check other points on the dial for accuracy of calibration. Readjust
the above settings for beet compromise on overall accuracy,
Pulse Position Calibration -- No adjustments are provided for setting the
PULSE -ON control. The position of "01' delay or advance is ob-
tained by slipping the dial on the shaft to the correct position.
The maximum delay obtainable depends on V 105.
The maximum advance obtainable depends on VIOL.
NOTE
At maximum rate do not use delays in excess of
50 microseconds, or, at max. delay do not use
ratea in excess of 2500 pps.