Tektronix TYPE CA Instruction Manual page 18

7. Tektronix 20pf Input Capacitance
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
Fig. 5-1. pecial Dual-Input coax connector.
12. Miscellaneous alignment tools.
5-2.
PROCEDURE
1. Preliminary Check
Before installing the Type CA Plug-In Unit
in the oscilloscope, make a careful visual
inspection of the wire dress. This
ticularly important if any soldering has been
done to the unit. Then make the following
Fig. 5-2. Low capacitance, insulated alignment tools used to calibrate
the Type CA.
tandard ­
Part Number 003-035.
ee Fig.
is par ­
Calibration - Type CA
resistance-to-ground checks at the 16-pin inter ­
connecting plug. The table below lists the
nominal resistance value from each pin to
ground.
NOMINAL RE I TANCE AT
INTERCONNECTING PLUG
RE I TANCE-TO-GROUND
PIN NUMBER
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
Install the Type CA Unit in the oscilloscope.
Turn on all the test equipment and allow
15 minutes for it to warm up.
scope controls as follows:
HORIZONTAL DI PLAY
TRIGGERING MODE
TRIGGER LOPE
TABILITY
TIME/CM
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:
VOLT /CM (A and B)
8.5k
0
8.5k
infinite
infinite
infinite
infinite
0 (MODE switch
at ALTERNATE)
12k
2k
6.3k
infinite
infinite
infinite
650
infinite
et the oscillo ­
INTERNAL
WEEP (541A)
MAIN WEEP
NORMAL
(545A)
AUTOMATIC
-INT
PRE ET
1 MILLI EC
.05
AA