Service Manual
Specification Test
Purpose: Test if some specifications are in the specified range.
Table 3-2 require instruments
Description
Minimum requirements
Examples
DC Voltage Source
-6 mV to 30 V,
±0.1% accuracy
Standard sine wave
generator
10Hz
and 300MHz
,
±1% amplitude
accuracy
FLUKE 9500B
50
Ω
BNC
Feed-Through
Termination
DC to 1GHz
PL-50
Before beginning these procedures, two conditions must first be met:
●
The oscilloscope must have been operating continuously for thirty minutes within the
operating temperature range specified.
●
You must do the Self Calibration procedure. If the ambient temperature changes by more
than
5℃
, you must do the Self Calibration procedure again.
Picture 3-9 Test instrument connecting
Test DC Gain Accuracy
Steps
：
1
、
Set the DC voltage source output level to 30 V
2
、
Press the button “DEFAULT/SETUP” of oscilloscope
3
、
Set VOLT/DIV to 10V/div, set measure parameter as “CH1,Mean”
4
、
Connect the oscilloscope channel 1 to the DC voltage source, and record the value of
Mean appeared on the screen as V
pos
.
5
、
Change the polarity of the DC voltage source
，
and record the value of Mean appeared
on the screen as V
neg
.
6
、
Calculate V
diff
=V
pos
– V
neg
，
then compare V
diff
to accuracy limits in the table.
