TM 11-6625-3025-14/ET426-AA-MMA-010/E154 VII210/T.O. 33A1-8-902-1-1
6-43. Resolution Adjustment. This function includes many operating conditions and modes, each of which must be
adjusted independently. The most common basis for adjustment of signal repetition rate is resolution in tv lines, as
detailed in table 6-4. Adjustment can be based on other standards, such as burst frequency, or on other customer
specified conditions. The control panel markings are 1 through 10 without reference to units, therefore, allowing various
adjustment bases. Adjustments will be set for 100 through 1000 tv lines resolution repetition rate, per table 6-4 for circuit
cards 1 through 10, respectively. This function involves the following circuit cards (see figure FO-21):
Multiburst............................................................................................. Position 19C
Multiburst Clock................................................................................... Position 18C
Resolution 1 - Group 4A1.................................................................... Position 17C
Resolution 2 - Group 4k2 .................................................................... Position 16C
Resolution 3 - Group 4A3.................................................................... Position 15C
Resolution 4 - Group 4A4.................................................................... Position 14C
Resolution 5 - Group 4A5.................................................................... Position 13C
Resolution 6 - Group 4B6.................................................................... Position 12C
Resolution 7 - Group 4B7.................................................................... Position 11C
Resolution 8 - Group 4B8.................................................................... Position 10C
Resolution 9 - Group 4B9....................................................................... Position9C
Resolution 10 - Group 4B10................................................................... Position8C
The group designation identifies components whose values are selected for the particular application.
1.
Set the function selector switch at RESOLUTION and resolution selector on REFERENCE.
2. Set the oscilloscope channel 1 input amplitude sensitivity at 0.5v per division. Connect the oscilloscope
external sync connector to the H drive source. Set oscilloscope sweep rate to 10 usec per division.
3. The display should appear similar to figure 6-23a, showing approximately 12 cycles of black/white pattern
across the horizontal line. The waveform should be square without ringing or overshoot.
4.
The repetition rate is adjusted by control R30 located on the MULTIBURST card, figure 6-24.
CAUTION
Measurement technique regarding ringing and overshoot is critical on the fast rise
resolution signal. The case of the instrument under test should be firmly grounded
to the cases of all other instruments being used. Attention should be paid to
coaxial cable grounds to view the optimum output signal from the instrument. The
oscilloscope risetime capability must be verified before the output of the
instrument may be fully evaluated.
6-56
