Ratio A/B - HP 5334B Service Manual

Observe: These exact settings should be possible with the voltage reading increasing or decreasing in 0.02V
steps.
5. Set the HP 53348 as follows:
SENS
.......................................................................................................................
ON
Observe: Both trigger level settings should display 0.OOV.
Test Record: Mark Pass or Fail on the Operational Verification Test Record Card, line 2.
What checked:
1. In the READ LEVELS mode, the Digital-to-Analog circuitry and the Measurement microcomputer are
operating while the Input Amplifier and Multiple-Register Counter circuitry are inactive.
2. The DAC circuitry and the Measurement Data Bus are operating properly if the
+
2.54V settings can be ob-
tained.
3. If all tests are passed, the likelihood is high that the DACs, operational amplifier loops, the Read Level com-
parators, the analog switches (all are DAC circuitry components), and the front panel pots are operating
properly.
For Failures: If any failures are encountered in this test, refer to Section VIII of this manual. The Digital-to-
Analog Block is a likely candidate as a starting point for troubleshooting. Other circuit blocks involved are the
Measurement, Executive, and Front Panel blocks.
4-18. RATIO A/B
Description: This test uses the time base oscillator to drive the A and B input amplifier in a test of the Multiple-
Register Counter (MRC).
Procedure:
1. Connect the rear panel TIME BASE oscillator signal to the Channel A Input.
2. Set the HP 5334B as follows:
Reinitialize the 5334B.
COM A
...................................................................................................................
ON
AUTO TRIG
.........................................................................................................
OFF
..............................................................................
TRIGGER LEVEL controls midpoint setting
............................................................................................
CHAN A and B 50R
ON
.........................................................................................................
GATE TIME
1
Second
FUNCTION
...........................................................................................................
RATIO A/B
Observe: The HP 5334B front panel displays 1 000 000 0 MHz
k
0.2 Hz and both trigger lights are flashing.
Test Record: Mark Pass or Fail on the Operational Verification Test Record Card, line 3.
HP 5334B
-
Service Manual
4-5