Tektronix 545 Calibration Procedure

F A C T O R Y
Quick check for long ends, unsoldered joints, wire dress, etc.
trimmers to mid-range, except delay line.
are tight. Tighten set screws in both TRIGGER LEVEL knobs just snug enough so that
the knob can be turned on the shaft.
the scope in upright position and turn the INTENSITY and SCALE ILLUM. controls full
left (ccw). If, during the calibration there is any question concerning tolerances
or limits of any of the circuits, refer to the Factory Specifications on Types 5^1
and 5^5 Oscilloscopes.
1.

CHECK POWER SUPPLY RESISTANCE TO GROUND

The 100 v will be more than kOO Q to ground, the -150 v about 3&> 225 v more than
5K Q, 350 v more than 10K Q, and the 500 v supply above
primary for infinite resistance to ground (Pin 1, 2, 3»
2.

CHECK TIME DELAY RELAY

Turn the scope on and check time delay relay (15 to
3.

CHECK VOLTAGES AND MEASURE RIPPLE AND REGULATION

Adjust -150 v supply with -150 ADJ.
(±2$). Check elevated heater supplies at transformer terminals.
23, 225 v at 27 and 28, 350 v at 9 and 16, -hv at 2k and
k .

SET CAL. ADJ.

With the SQUARE-WAVE CALIBRATOR OFF adjust CAL. ADJ. for 100 v at CAL. TEST FT.
Turn CALIBRATOR on.
(Calibrator symmetry ±10/o).
Check power supplies for proper regulation with line at 105 v, TEST LOAD UNIT
switched to HI LOAD; and also, line at 125 v, TEST LOAD UNIT switched to LO LOAD.
The ripple on each supply in regulation will be as follows:
100 v, 5 millivolts;
(Measured with a test scope.)
5.

SET HV ADJ.

Turn scope to an upright position and adjust HV ADJ. control for -1350 v.
at front of the
shield. This adjustment can be made conveniently on the 1200 v scale on the meter
by measuring with respect to
stall shield over high voltage supply,
install a modified shield.)
STABILITY and INTENSITY controls and position the trace on the crt with the VER­
TICAL and HORIZONTAL POSITION controls.
6.

CHECK SCALE ILLUM AND POSITIONING CONTROLS

Check the SCALE ILLUM control.
dicating neon light s.
graticule lines, push crt forward against graticule and tighten crt clamp.
hv regulation by vaiying line from 105 v to 125 v.
ing.
September, 1959
TYPE 5*f5 OSCILLOSCOPE
C A L I B R A T I O N
Install TEST LOAD UNIT switched to LO LOAD with
Voltage at CAL. TEST PT. must read between k$ v and 55 v.
225
v, 3 millivolts;
27
K resistor at the forward ceramic strip located above the crt
-150
v instead of ground.
With MAIN SWEEP TIME/CM switch at 1 MILLISEC advance
Check position controls against the position-in­
Check scope for microphonics * Align trace with horizontal
P R O C E D U R E
Check to see that the ort pin connections
25
seconds).
Check 100 v, 225 v, 350 v, and 500 v supplies
350
v, 6 millivolts; 500 v, 7 millivolts.
Turn off the scope and in­
(if protective slide rails are being used,
There should be no trace bloom­
Preset all pots and
K £ 2 . Check transformer
(100 v at 22 and
25
.)
5
-150 v, millivolts;
Read
Check
5^5 1
-