Tektronix 570, Manual

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CALIBRATION
5.
POWER SUP PLY
a. Apply power
Connect 570 to variable line voltage source. set
source to 117 v. and turQ MAIN power ON. Note
both power indicator lights are on.
b.
-150 Adj (R413) +lOOv at DC+ jack:
±.5%. max
Connect Fluke meter between test panel DC+ jack
and gnd. Adjust -150 Adj for +100 v; ±.5%. max.
c.
-150v error: ±2%. max
Check -150 v supply value. If error is greater than
±2% install test mod M5264.
Repeat adjustment of -150 Adj for +100
v
at DC+ jack
Recheck -150 v value.
d.
HV Adj
-1700v: ±2%. max
Adjust HV Adj for -1700v at T401 term 24 or 25.
e. Check low voltage power supply values
supply error. max
-150v ±3v
+100 v
±2v
+300 v
±6v
supply error. approx
+400v unreg ±32v
-3002v unreg ±24v
+400 v floating unreg
±32v
-300 v floating unreg
±24v
f.
Elevated filaments
T40l term 12 and 13 approx +300 v
T501 term 18
100 v
g.
Phase inverter input
Measure 35 v ac across T40l term 29 and 30.
10
570 CALIBRATION
NOTES
5b. Calibration· accuracy
(1) Accurate calibration of this instrument is
very dependent upon the accuracy of DC+ jack
+lOOv .
. 5c. Mod 5264
(1)
Add R537 across R536 300k. R537 will gen­
erally be some value between 10 and 22 m
(higher resistance
=
higher -150v) . R536 is
located near V540 in floating power supply.
(2) Use this mod only when needed.
2-5-64
TEK' 570 FCP