Table 5-4: Voltage Regulation And Ripple - Tektronix 371B Service Manual

Performance Verification
5-12
NOTE. See "Test Point and Adjustment Locations Pullout 3" in Chapter 8 for the
location of test points for this step.
Examining Voltage Deviation.
1. Connect the digital multimeter to the +5 V test point on the A25 Main Power
Supply board.
2. EXAMINE the digital multiplier reading at the +5 V test point and each of
the other power supply test points listed in Table 5–4 for voltage levels
within the given deviation.
Examining Ripple.
3. Disconnect the digital multimeter and connect the test oscilloscope to the
+5 V test point.
4. EXAMINE the test oscilloscope display at each of the test points listed in
Table 5–4 for the ripple displays within the given deviation.
Removing the Setup.
5. Disconnect the test oscilloscope.

Table 5-4: Voltage Regulation and Ripple

Voltage Test Point
+5.2 V +5
-12 V -12
+12 V +12
-6.5 V -6.5
+6.5 V +6.5
Deviation Limits (V) Ripple (mV)
+4.992 to +5.408 v200
-11.4 to -12.6 v100
+11.4 to +12.6 v100
-6.37 to -6.67 v50
+6.37 to +6.67 v50
371B Service Manual