Performance Check—2465B/2467B Service'
f. Change CH 1 Input Coupling to 50 fl DC.
g.
VERIFY—For a period of one minute, the readout
display does not indicate any overload condition (50 Q
OVERLOAD).
h. Change the CH 1 VOLTS/DIV control to 5 V and the
CH 1 Input Coupling to 1 MQ DC.
NOTE
Select channels to set VOLTS/DIV.
CH 1, CH 2 VOLTS/DIV 100 mV
CH 1 VERTICAL MODE On
CH 2 VERTICAL MODE Off
A SEC/DIV 10 ms (knob in)
CH 1 and CH 2
Input Coupling 1 Mfi GND
i. Increase the Power Supply output level until the CH 1
trace rises to the center graticule line (+20 V).
b. Connect the CALIBRATOR output signal to the CH 1
OR X input connector using a 1X probe.
To prevent damage to the input circuitry when in
50 n DC, the 20 V source must not be applied to the
CH 1 OR X or CH 2 input connectors for longer than
20 seconds. If the automatic OVERLOAD switching
does not occur within 20 seconds, turn the Power
Supply off immediately.
c. Position the ground-reference trace 2 divisions below
the center horizontal graticule line.
d.
Set the CH 1 Input Coupling to 1 Mil DC.
e. CHECK—Displayed signal is vertically centered and
has an amplitude of 3.88 to 4.12 divisions.
j.
Set the CH 1 Input Coupling to 50 fl DC.
k. VERIFY—Within 20 seconds after CH 1 input
cou-
pling is set to 50 ft DC, the readout display indicates
"50 fi OVERLOAD", the CH 1 Input Coupling changes
to 1 Mfi GND automatically, and the trace returns to
the bottom horizontal graticule line.
I. Turn the Power Supply Off.
m. Disconnect the Power Supply from CH 1 input.
f. Set the CH 1 Input Coupling to the upper 1 Mft GND
position.
g.
Using the CH 1 POSITION control, align the trace
with the center horizontal graticule line.
h. Set the CH 1 Input Coupling to 1 Mfi AC.
i. CHECK—Displayed signal is a tilted square wave,
4.36 to 5.37 divisions in amplitude, vertically centered on
the graticule.
n. Clear the OVERLOAD condition by pressing the
upper CH 1 Input Coupling button.
j.
Move the probe to the CH 2 input connector.
o. VERIFY—The CH 1, 1 Mfi DC indicator is lit and the
readout display no longer indicates "50
Q
OVERLOAD".
k. Set the VERTICAL MODE buttons to deselect CH 1
and display CH 2.
p. Set the VERTICAL MODE buttons to display CH 2
and repeat parts a through o to verify 50 fl OVERLOAD
protection for CH 2.
2.
Check CH
Coupling.
a. Set:
1 and CH 2 Low-Frequency AC
NOTE
Instruments with TV OPTION 05 have a TV CLAMP
feature that is enabled by pushing the upper CH 2
INPUT COUPLING button while in AC COUPLING.
The letters "TVC" appear in the top right readout
when this mode is selected. Push the lower CH 2
INPUT COUPLING button to return to normal AC
coupling.
4-5
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