Tektronix TDS 820, Manual

Page: 62 / 94

Performance Tests
Performance Verification
1Ć48
b. Check for external trigger source for stable triggering at limits: Do the
following in the order listed.
H
Use the definition for a stable trigger from step 2.
H
Press TRIGGER MENU; then press the main-menu button
Source.
H
Press the side-menu button External Trigger.
H
Press SET LEVEL TO 50%. CHECK that a stable trigger is
obtained for the test waveform on both the positive and negative
slopes. Press the main-menu button Slope; then use the side
menu to switch between trigger slopes. Use the TRIGGER LEV-
EL knob to stabilize the trigger if required.
c. Repeat substep b with the generator frequency set to 200 MHz, the
horizontal SCALE set to 5 ns, and the generator amplitude set to
40 mV (as read on the oscilloscope amplitude readout).
d. Repeat substep b with the generator frequency set to 2 GHz, the
horizontal SCALE set to 500 ps, and the generator amplitude set to
200 mV (as read on the oscilloscope amplitude readout). Leave the
Main trigger system triggered on the positive slope of the waveform
before proceeding to the next check.
5. Disconnect the hookup: Disconnect the cables, attenuator, adapter, and
power divider from the generator output at the input connectors of the
oscilloscope.
Check Trigger Delay Jitter and Random Noise
Equipment Required:
One high-frequency sine-wave generator (Item 15),
an N to BNC adapter (Item 11), a precision coaxial cable (Item 2), two 50
W
SMA cables (Item 3), one 50
W
power divider (Item 12), and one BNC to SMA
adapter (Item 8).
Prerequisites:
See page 1-11.
Procedure:
1. Preset the instrument controls:
a. Initialize the oscilloscope:
H
Press save/recall SETUP.
H
Press the main-menu button Recall Factory Setup.
H
Press the side-menu button OK Confirm Factory Init.
H
If your oscilloscope has delay lines (standard instrument), set the
vertical SCALE to 2 mV. If your oscilloscope does not have delay
lines (Option 1D), set the vertical SCALE to 1 mV.
2. Confirm input channels are within limits: Do the following substeps – test
CH 1 first, skipping substep a since CH 1 is already setup to be checked
from step 1.