Tektronix 310A, Instruction Manual, Page: 69 / 132

Performance Check/Calibration-Type 310A
22. Check Upper Vertical Bandwidth Lim it
a. Equipment required for steps 22 through 37 is shown
in Fig. 5-15.
b. Connect the high-frequency constant-amplitude sine-
wave generator to the vertical INPUT connector through
the GR to BNC adapter, 42-inch 50-ohm BNC cable and the
50-ohm BNC termination, in given order.
c. Set the constant-amplitude generator for a four-
division display centered on the graticule at its reference
frequency (50 kilohertz).
d. Without changing the output amplitude, increase the
output frequency of the generator until the display is
reduced to 2.8 divisions (—3 dB point).
e. CHECK—Output frequency of generator must be
f o u r
megahertz or higher.
f. Set the VO LTS/DIV switch to .05.
g. Set the constant-amplitude generator for a four-
division display, centered on the graticule, at its reference
frequency (50 kilohertz).
h. Without changing the output amplitude, increase the
output frequency of the generator until the display is
reduced to 2.8 divisions (—3 dB point).
i. CHECK—Output frequency of generator must be 3.5
megahertz or higher.
j. Repeat parts g through i with the VO LTS/D IV switch
set to .02 and .01.
k. Disconnect all test equipment.
e. C H ECK-CRT display 2.8 divisions or greater in
amplitude (not more than - 3 dB).
f. Disconnect all test equipment.
24. Check High-Frequency Triggering Operation
a. Change the following control settings:
VO LTS/D IV 1
Input Coupling DC
T IM E /D IV 1
f i S E C
b. Connect the high-frequency constant-amplitude sine-
wave generator to the vertical INPUT connector through
the GR-to-BNC adapter, 42-inch 50-ohm BNC cable, 50-
ohm BNC termination and the BNC T connector. Connect
the output of the BNC T connector to the EXT TRIG
INPUT binding post with the 18-inch BNC-to-banana plug
patch cord.
c. Set the high-frequency generator for a two-division
display at two megahertz.
d. CHECK—Stable CRT display is presented.
e. Set the high-frequency generator for a two-division
display at four megahertz.
f. Set the T IM E /D IV switch to .5 juSEC.
g. CHECK—Stable CRT display can be obtained with
the Trigger Coupling-Mode switch set to AC and DC (TRIG
LEVEL control may be adjusted as necessary to obtain a
stable display).
h. Change the following control settings:
TRIGGER + EXT
Trigger Coupling-Mode AUTO
T IM E /D IV 10*zSEC
23. Check AC-Coupled Lower Vertical Bandwidth
Limit
a. Change the following control settings.
VO LTS/DIV .1
T IM E /D IV 1.2 SEC
b. Connect the low-frequency constant-amplitude sine-
wave generator to the vertical INPUT connector through
the BNC-to-dual binding post adapter, 42-inch 50-ohm BNC
cable and the 50-ohm BNC termination.
c. Set the low-frequency generator for a four-division
display, centered on the graticule, at a reference frequency
of one kilohertz.
d. Without changing the output amplitude, reduce the
output frequency of the generator to two hertz.
i. Set the high-frequency generator for a two-division
display (two volts) at its reference frequency (50 kilohertz).
j. Set the T IM E /D IV switch to ,5^SEC.
k. Without changing the output amplitude, set the
constant-amplitude generator to two megahertz.
l
. CHECK—Stable CRT display is present.
m. Without changing the output amplitude, set the
constant-amplitude generator to four megahertz.
n. CHECK—Stable CRT display can be obtained with
the Trigger Coupling-Mode switch set to AC and DC (TRIG
LEVEL control may be adjusted as necessary to obtain a
stable display).
o. Disconnect the high-frequency generator.
5-19