Performance Verification
4-4
TDS1000B and TDS2000B Series Oscilloscope Service Manual
3. Verify that self calibration passed.
This test checks the DC gain accuracy of all input channels.
1. Set the DC voltage source output level to 0V.
2. Set up the oscilloscope using the following steps:
Push menu button Select menu option Select setting
1. DEFAULT SETUP — —
2. CH 1 Probe 1X
3. ACQUIRE Average 16
4. MEASURE
Source Channel under test
Type Mean
3. As shown below, connect the oscilloscope channel selected in the table to the
DC voltage source.
+--
DC voltage
source
Dual banana
to BNC
adapter
BNC cable
Digitizing oscilloscope
4. For each VOLTS/DIV setting listed below, perform the following steps:
a. Set the DC voltage source output level to the positive voltage listed and
then record the mean measurement as V
pos
.
b. Reverse the polarity of the DC voltage source and then record the mean
measurement as V
neg
.
c. Calculate V
diff
=V
pos
-- V
neg
and then compare V
diff
to the accuracy
limits in the table.
Check DC Gain Accuracy