Performance Verification
4–4
TDS 200 Series Digital Oscilloscope Service Manual
This test checks the DC gain accuracy of all input channels.
1. Set the DC voltage source output level to 0 V.
2. Set up the instrument using the following steps:
Press menu button Select menu item Select setting
SAVE/
RECALL
Recall
Factory
—
CH 1 Probe 1X
ACQUIRE Average 16
MEASURE
Source An unchecked channel
Type Mean
3. As shown below, connect the instrument 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.
VOLTS/DIV setting DC voltage source output levels Accuracy limits for V
diff
5 mV/div +17.5 mV, –17.5 mV 33.3 mV to 36.7 mV
200 mV/div +700 mV, –700 mV 1.351 V to 1.449 V
2 V/div +7.00 V, –7.00 V 13.51 V to 14.49 V
Check DC Gain Accuracy
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