7. Tektronix 20pf Input Capacitance Standard
izer,
Tektronix
part
number
011-022.
8. 50
ohm 5XT attenuator, Tektronix Part
Number
011-032.
9. 50
ohm cable termination, Tektronix Part
Number
011-045.
10. Tektronix Type P52 Coaxial Cables, 52 ohms
characteristic
impedance.
11.
Tektronix Dual Input Connector, see Fig.
5-1. Tektronix Part
Number 003-035.
resistance-to-ground
checks at the 16-pin inter
connecting plug.
The
table below lists the
nominal resistance value from each
pin to
ground.
Fig.
5-1.
Special Dual-Input coax connector.
NOMINAL
RESISTANCES
AT
INTERCONNECTING PLUG
PIN
NUMBER
RESISTANCE-TO-GROUND
1
8.5k
2
0
3
8.5k
4
infinite
5
infinite
6
infinite
7
infinite
8
0
(MODE switch
at
ALTERNATE)
9
12k
10
2k
11
6.3k
12
infinite
13
infinite
14
infinite
15
650
16
infinite
12. Miscellaneous
alignment tools.
See Fig.
5-2.
PROCEDURE
Install the
Type
CA Unit
in the oscilloscope.
Turn
on
all
the test equipment
and
allow
15 minutes
for it to warm up. Set the oscillo
scope
controls as follows:
1.
Preliminary Check
HORIZONTAL DISPLAY
Before installing the Type
CA
Plug-In Unit
in the oscilloscope, make a careful visual
inspection
of the wire dress. This is par
ticularly important if any soldering has
been
done to
the unit.
Then make the following
TRIGGERING MODE
INTERNAL
SWEEP
(541A)
MAIN
SWEEP
NORMAL
(545A)
AUTOMATIC
Fig. 5-2. Low capacitance, insulated alignment tools used to calibrate
the Type CA.
TRIGGER
SLOPE
-INT
STABILITY
TIME/CM
PRESET
1
MILLISEC
After
the
oscilloscope
has warmed up,
adjust
the
-150 Adj. so
that a reading of
exactly
+100 volts is obtained from the +100 volt
power
supply of the oscilloscope.
Now
preset
the Type
CA controls as
follows:
VOLTS/CM
(A
and B)
.05
Calibration
- Type CA
AA
