Tektronix 310A, Instruction Manual, Page: 75 / 132

Performance Check/Calibration—Type 310A
Fig. 5 -2 0 . Lo cation o f calibrato r a m p litu d e Adjustment (right side).
g. ADJUST—Cal Adj, R510 (sea Fig. 5-20), for no
difference between the standard amplitude calibrator out
put level and the Typo 310A calibrator output level,
h. CHECK-Using the CALIBRATOR switch, VO LTS/
D IV switch and standard amplitude calibrator settings given
in Table 5-6, check the accuracy of the remaining C A L I­
BRATOR switch positions. Adjust the VER TICA L POSI
TION control as nocessary to keep the top of the waveform
on the display urea. For the CALIBRATOR switch posi
tions of 0.5 and below, ignore the waveform tilt and
measure the accuracy at the point where the display
switches from the standard amplitude calibrator level (solid
portion! and the Type 310A calibrator output level
(segmented portion).
i Disconnect all test equipment.
TABLE 5-6
Calibrator Accuracy
Type 31OA
CALIBRATOR
switch
setting
VO LTS /D IV
switch
setting
Standard
amplitude
calibrator
output
Allowable
difference
for 13%
accuracy
(divisions)
50
5
50 volts
0.3
20 2
20 volts
0.3
10 1
10 volts
0.3
5
.5
5 volts
0.3
2 .2
2 volts
0.3
1
.1
1 volt
0.3
.5
.05 0.5 volt
0.3
.2
.02 0.2 volt
0.3
.1 .01
0.1 volt
0.3
.05
.01 50 millivolts
0.15
39. Check Calibrator Repetition Rate
a. Change the following control settings:
VO LTS /D IV .5
TRIGGER + I N T
T IM E /D IV 200/iSEC
CALIBRATOR 2
b. Connect the CAL OUT binding post to the vertical
INPUT connector with the 18 inch BNC-to-banana plug
patch cord..
c. Position the start of the trace to the first vertical line
o f the graticule with the H O R IZO N TAL POSITION
control.
d. CHECK CRT display for duration of one complete
cycle about five divisions (repetition rate approximately
one kilohertz).
c. Disconnect all test equipment.
40. Check External Horizontal Deflection Factor
a. Change tho following control settings
T IM E /D IV 2 pSEC
Horizontal Display EXT HORIZ
b. Connect the standard amplitude calibrator to tho
EXT HORIZ INPUT and GND binding posts on the rear
panel with the 42-inch BNC cable and the BNC-to-dual
binding post adapter.
c. Set the standard amplitude calibrator for a 10-volt
square-wave output.
d. Center the display (two dots) on the display area. If
necessary, increase the IN TEN SITY control setting to view
the display.
e. C H E C K -C R T display for minimum horizontal
deflection of 6,67 divisions (1.6 volt/division, or less,
external horizontal deflection factor).
f. Disconnect all test equipment.
41. Check External Horizontal Bandwidth
a. Connect the low frequency constant-amplitude gen
erator to the EXT HORIZ INPUT binding post through the
BNC-to-dual binding post adapter, 42-inch BNC cable and
the BNC-to-dual binding post adapter.
b. Set the low frequency constant amplitude generator
for a six division display at one kilohertz.
c. Without changing the output amplitude, increase the
output frequency of the generator to 500 kilohertz.
d. C H E C K -C R T display for 4.2 divisions or greater
horizontal deflection (not more than —3 dB).
e. Disconnect all test equipment.
5-25