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TB 9-6625-1996-35
5
(4) SAMPLE RATE control fully ccw.
(5) CHANNEL A and B LEVEL controls to PRESET.
(6) CHANNEL A and B SLOPE switches to + (positive).
(7) CHANNEL A and B input impedance switches to 50 Ω.
(8) CHANNEL A and B ATTEN switches to X1.
(9) CHANNEL A and B AC-DC switches to DC.
(10) CHECK-COM A-SEP switch to SEP.
8. Time Base Stability
a. Performance Check
(1) Connect time/frequency workstation OUTPUT 1 MHz to frequency difference
meter REF INPUT.
(2) Connect TI FREQ STD OUTPUT 10 MHz (rear panel) to frequency
difference meter SIG INPUT.
(3) Adjust A18 FREQ ADJ (fig. 1) for minimum difference indication on frequency
difference meter.
Figure 1. Test instrument - top view.
(4) Allow at least 24 hours for stabilization. Frequency difference meter
indication will remain within 5 parts in 10
-10
.
(5) Adjust autotransformer output to 105 V and allow 15 minutes for
stabilization. Verify that TI oscillator drift is less than 1 part in 10
-10
.
(6) Adjust autotransformer output to 125 V and allow 15 minutes for
stabilization. Verify that TI oscillator drift is less than 1 part in 10
-10
.
(7) Adjust autotransformer output to 115 V.
b. Adjustments. No further adjustments can be made.