Tektronix 2245A - Page 193

Tektronix m a n u a l c h a n g e in f o r m a t io n
CO MM UT ED TO bX OB LE NC E
Date: 1-14-91 Change Reference: C4/0190 (REV2)
Product: 2245A OPERATORS______________ Manual Part Number: 070-6558-01
DESCRIPTION Product Group 46
EFFECTIVE ALL SERIAL NUMBERS
Page 7-33 Step 6. Trigger Level Control Range
Replace part c of step 6 with the following:
c. Increase leveled sine-wave generator output level until a stably trig
gered display is just obtainable.
Page 7-49 Step 2. PROBE ADJUST Output and Step 3.
AUTO SETUP Functional Check
Replace steps 2 and 3 with the following procedures:
2. PROBE ADJUST Output
a. Set:
Test Oscilloscope VOLTS.DIV 10 mV
Test Oscilloscope SEC/DIV 0.2 ms
b. Connect a 10X probe to the test oscilloscope and connect the probe tip
to the 2245A PROBE ADJUST output.
c. CHECK-For a 0.5 V (± 2% into 1 MO) of PROBE ADJUST square-
wave signal (square-wave period is typically 1 ms, within 25%).
NOTE
Remember to take into account the oscilloscope and probe speci
fications when determining the accuracy of the PROBE ADJUST
square-wave signal.
3. AUTO SETUP Functional Check
a. Disconnect the 10X probe from the test oscilloscope and connect it to
the 2245A CH 1 input, leaving the probe tip attached to the PROBE
ADJUST output.
a. Set:
CH 1 COUPLING GND
CH 1 VOLTS/DIV 2 mV
A SEC/DIV 20 ns
b. Press the AUTO SETUP button.
c. Check that the Probe Adjust waveform is stably displayed on the upper
half of the crt.
d. Disconnect the test setup.
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