Preliminary Control Settings; Calibration Procedure - Tektronix 7B51 Instruction Manual

Performance Check/Calibration-Type 71351
Requirement: Accurate within 1 minor division at each
major dial division between 1 .00 and 9.00.
Performance: Correct ; Incorrect
21 . Check Delay Time Accuracy
Page 5-13
Requirement: The delay time accuracy over the center
eight divisions is within 1% between 1 us/Div and .5 s/Div;
within 2% between 1 s/Div and 5 s/Div.
Performance: Correct
; Incorrect (list any
discrepancies)
22 . Check Delay Time Jitter
Page 5-13
Requirement : Jitter does not exceed 1 part in 50,000 of
10 times the TI ME/DIV setting.
Performance : Correct ; Incorrect
23 . Check Line Trigger Source
Page 5-14
Requirement: Stable triggering of the proper polarity
with the LEVEL/SLOPE control at 0/+ and 0/-- .
Performance: Correct ; Incorrect
General
PERFORMANCE CHECK/CALIBRATION
PROCEDURE
The following procedure is arranged so the Type 71351
can be calibrated with the least interaction of adjustments
and reconnection of equipment . A picture of the test equip-
ment required for each group of steps is given to aid in
identification of the necessary equipment. The control
settings continue from the preceding step(s) unless noted
otherwise .
The following procedure uses the equipment listed under
Test Equipment Required . If other equipment is substi-
tuted, control settings or calibration setup may need to be
altered to meet the requirements of the equipment used .
Detailed operating instructions for the test equipment are
not given in this procedure. Refer to the instruction manual
for the test equipment if more information is required .
5-4
NOTE
This instrument should be calibrated to an ambient
temperature
of
+25 ° C ±10°C for best overall
accuracy . If the temperature is outside the given
range, see Section 1 for the applicable tolerances.
Preliminary Control Settings
Test Time-Base
(A horizontal plug-in compartment)
Level/Slope 0/+
Triggering
Mode
P-P Auto
Coupling
AC
Source
Int
Position
Midrange
Magnifier
X1
B Delay Mode
Independent
Time/div .1 ms
Variable Cal In
Type 713511
(B horizontal plug-in compartment)
Type 7504, Indicator Oscilloscope
A Intensity
CCW
B Intensity
CCW
Vertical Mode
Left
Horizontal Mode
A
A Trigger Source Left Vert
B Trigger Source Left Vert
Turn the indicator oscilloscope power on and advance
the A Intensity until a free-running trace is observed .
Center the trace on the CRT with the horizontal and verti-
cal POSITION controls and allow several minutes warmup
before proceeding with calibration .
CALIBRATION PROCEDURE
1 . Check/Adjust Level Center (R385)
a . Test equipment required is shown in Fig . 5-1 .
b. Connect a BNC "T" connector to the output of the
low-frequency sine-wave generator . Using two 50 0 BNC
LEVEL/SLOPE 0/+
TRIGGERING
MODE NORM
COUPLING
AC
SOURCE EXT
POSITION MIDRANGE
MAGNIFIER X1
B DELAY MODE
INDEPENDENT
TIME/DIV
20 ps
VARIABLE CAL IN
Type 7A16
AC-GND-DC DC
Volts/div
.5 V
Position Midrange
Polarity
+ UP