THM500 Series Performance Verification
Handheld and Benchtop Instruments Basic Service
15
Oscilloscope Verification
The following checks verify the performance of the oscilloscope functions. The
DMM checks begin on page 12.
NOTE. The THM575 can display the menus in more than one language. The
language selections are located in the Utility menu.
The following check verifies an acceptable noise level.
1. Set the THM500 series instrument to SCOPE mode. If necessary, press the
SELECT button to point to CH 1.
2. Use a patch cord to short the THM500 series instrument COM and CH 1
inputs as shown in Figure 4.
THM5xx
CH 1COM
Patch cord
Figure 4: Noise Test Setup
3. Press the SCALE button until the readout in the lower-right corner indicates
SCALE; then use the
Y
and
B
buttons to set the vertical scale to 10 mV/div.
4. Use the menus to set the sampling mode to SPIKE DETECT; then turn off
the menus.
5. Verify that the displayed peak-to-peak signal is less than 0.5 divisions
(5 mV
p-p
).
6. If your THM500 series instrument is equipped with two channels, repeat
steps 2 through 5 above for CH 2.
7. Disconnect the test setup.
Noise
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