Tektronix DCM300, Technical Reference

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THM500 Series Performance Verification
20
Handheld and Benchtop Instruments Basic Service
3. On the THM500 series instrument, press the POSITION/SCALE button
until the readout shows SCALE in the lower-right corner.
4. For each row of Table 11, perform the following steps:
a. Use the THM500 series instrument Y and B buttons to set the vertical
scale to the setting listed in the first column.
b. Set the horizontal scale of the THM500 series instrument to 10
m
s/div
and the frequency of the leveled sine wave generator to 50 kHz.
c. Adjust the leveled sine wave generator amplitude to show the waveform
height and cursor readout listed in the second column.
d. Set the horizontal scale of the THM500 series instrument to 200
m
s/div
and the leveled sine wave generator to the test frequency listed in the
third column.
e. Verify that the amplitude of the waveform displayed on the THM500
series instrument is greater than or equal to the value listed in the third
column. Use the cursors for greater accuracy.
Table 11: Bandwidth Test Settings
THM500 Series
Vertical Scale Leveled Sine Wave
Generator Amplitude Leveled Sine Wave
Generator Test Frequency Instrument Waveform
Amplitude
100 mV/div 6 divisions
(600 mV
p-p
readout)
5 MHz 4.2 divisions
1
(420 mV cursor readout)
500 mV/div 6 divisions
(3.00 V
p-p
readout)
5 MHz 4.2 divisions
1
(2.1 V cursor readout)
5 V/div 1 division
(5.00 V
p-p
readout)
1 MHz 0.7 divisions
1
(3.5 V cursor readout)
1
The waveform is aliased and appears untriggered.
5. If your THM500 series instrument is equipped with two channels, repeat
Step 4 above on CH 2 (all tests).
6. Disconnect the test setup.
The following check assesses the crosstalk between the DMM and the oscillo-
scope.
1. Connect the leveled sine wave generator output to the THM500 series
instrument DMM and COM inputs. Use a 50
W
termination as shown in
Figure 9. Assure that the ground connection for each adapter connects to the
common (or ground) connector of its associated instrument.
Crosstalk from
DMM to Oscilloscope