Tektronix TYPE L, Instruction Manual, Page: 45 / 46

TYPE L
' Text Correction (13)
Replace the second paragraph of step 13 and the first paragraph of
step 14 with the following.
Remove the Type EP54 Plug-In Extension for this step. Now set the
AC-DC switch in DC position and the VOLTS/CM switch at .05. Install
a 20 pf Input Capacitance Standardizer on the INPUT connector of the
L Unit, and 5X Attenuator on the Standardizer. Apply a 1 kc signal
with a P52 cable from a Type 105 Square-Wave Generator to the
Attenuator/Standardizer combination on the Type L Plug-In Unit.
Adjust the amplitude of the display to about 3.5 cm with the OUTPUT
AMPLITUDE control on the Type 105. AdjustC5732 for an optimum flat
top.
.
*
Make the adjustment to C5732 from the bottom of the plug-in with a
small pocket screwdriver. The screwdriver will have to be removed,
each time the waveform is checked since the metal blade introduces
distortion.
14. Attenuator Input Capacitance and Frequency Compensation Adjust­
ments.
Trim m er capacitors are provided for standardizing the input cap­
acitance and compensating the voltage dividers at each step of the
VOLTS/CM switch. This is done so the plug-in will always present
an input characteristic of 1 megohm of resistance shunted by 20
picofarads of capacitance, while maintaining frequency compensation.
This permits a single setting of the probe adjustment suitable for
all positions of the VOLTS/CM switch.
Re-install the Type EP54 Plug-In Extension. The top of the waveform
in each position of the VOLTS/CM switch should match the top of the
waveform as seen in the .05 position.
NOTE
This will no longer be a flat top since the EP54
introduces some peaking.