Tektronix TYPE L Instruction Manual page 30

waveform , with fastest risetim e but no o v e r­
shoot.
18. Check Frequency Response
After calibrating the Type L Plug-In Unit
as described in the previous paragraphs, check
the frequency response of the unit.
With the 50f2 Terminating Resistor installed
on the INPUT connector of the Type L Unit,
connect the Attenuator head from a Tektronix
Type 190( ) Constant-Amplitude Signal Gen­
erator to the Terminating Resistor.
TIME/CM switch at lOOpSEC, the VOLTS/CM
switch at .05 (black numbers), AC-DC switch
at DC, S T A B ILIT Y fully clockwise and TR IG ­
GERING MODE at AC (AC
50 kc signal from the Type 190( ) and adjust
the amplitude with the OUTPUT AM PLITUDE
control and the ATTENUATOR switch of the
5-6
Set the
SLOW). Apply a
Calibration Procedure - Type L Plug-In
Type 190( ) fo r exactly three centimeters of
vertical deflection. Without changing any other
controls, increase the output frequency of the
Type 190( ) until the vertical deflection
reduced to exactly 2.1 cm. This is the 3-db
down point and should occur at approximately
30 megacycles.
Install a 10X Attenuator between the Attenuator
head of the Type 190( ) and the Terminating
R esistor on the INPUT connector of the T yp eL.
Set the AC-DC switch at X10 GAIN AC and
apply a 50 kc signal as before.
display amplitude for exactly 3 cm with the
controls of the Typ el9 0 ( ), then without changing
any other controls, increase the output f r e ­
quency of the Type 190( ) until the vertical
deflection on the crt is exactly 2.1 cm. This
is the 3-db down point of the X10 amplifier
and should be approximately 24 MC.
is
Adjust the
AA