Tektronix RTD 710A Service Manual page 260

Performance Check/Adjustment Procedures
D. A/D CONVERTER
There are two A/D Converter Boards in the RTD 710A, one for CH1 (A18/CH1) and one for CH2 (A18/CH2).
Both boards are covered by the same procedures in this subsection. Rather than repeat the procedures, we
list the procedures once using CH1 references, and include the CH2 references in parentheses. To accomplish
this procedure, first perform all the procedures on CH1, then repeat the procedures for CHa.
Equipment Required:
Oscilloscope
Sine Wave Generator
Functional Generator
X10 FET Probe
10X Probe
50 ohm Cable (2)
50 ohm Termination (2)
D1. CHECK CH1 (CH2) A/D VOLTAGES
AND VOLTAGE SUPPLIES (A18)
a.
Tum the RTD 710A front-panei power switch to
STANDBY and the rear-panel PRINCIPAL POWER
. Remove the CH1 A/D Board A18/CH1 (CH2 A/D
Board A18/CH2), install the A/D Extender from the
Service Kit (067-1376-00), and reinstall the A/D
Board on the extender.
c. Turn the RTD 710A rear-panel PRINCIPAL POWER
SWITCH and the front-panel power switch to ON.
. Connect the Digital Voltmeter between the test
points listed in Table 4-4 and ground (TP001
through TPOO7 are grounds) on A18/CH1
(A18/CH2) and CHECK that the supplied voitage
at each test point is within the Voltage Limits
shown.
SUPPLIED VOLTAGES
TEST POINTS
SUPPLIED VOLTAGE
LIMITS (VOLTS)
14.775 ~ -15.225
~14.775 ~ ~15.225
TPOGO (+5VL) 4.925 - -5.075
TPO70 (~5VL) 4.925 - -5.075
TP020 {-5VD) 4.900 - -8.100
TP030 (-2VD) 1.800 - ~2.200
RTD 710A Service Manual