Performance Tests
4-68
CSA7404B, TDS7704B, TDS7404B, TDS7254B & TDS7154B Service Manual
H Record the difference of the two mean measurements in the
Difference of Measurement Means column of Table 4--4.
H CHECK that the Difference of Measurement Mean is within the
limits listed for the current vertical scale/position/offset/generator
settings. Enter measurement mean difference value on test record.
h. Repeat substeps:
H Repeat substeps d through g, using the next position, offset and
generator settings listed in the table for the current vertical scale.
H Repeat substeps d through g, using the next position, offset and
generator settings listed in the table for the current vertical scale.
i. Repeat substeps c through h until all vertical scale settings, listed in
Table 4--4, are checked for the channel under test.
j. Test all channels: Repeat substeps a through i for all four channels.
3. Disconnect the hookup:
a. Set the generator output to 0 V.
b. Disconnect the cable and adapter from the generator output and the input
connector of the channel last tested.
Equipment
required
Two dual-banana connectors (Item 5)
One BNC T connector (Item 6)
One DC calibrat ion generator (Item 9)
One SMA male-to-female BNC adapter (Item 19)
Two precision 50 Ω coaxial cables (I tem 4)
Prerequisites The instrument must meet the prerequisites l isted on page 4--17
WARNING. The generator is capable of outputting dangerous voltages. Be sure to
set the DC calibration generator to off or 0 volts before connecting, disconnect-
ing, and/or moving the test hookup during the performance of this procedure.
Also, check that the calibrator does not have shorting straps installed between
the DC output, sense input, or grounds.
Check Offset Accuracy
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