THM500 Series Performance Verification
Bench Test Instruments and Handheld Oscilloscopes 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 1
COM
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
