Motorola R-2001A Service Manual page 77

5-136. Frequency Counter
1. Set the UUT to the Gen CW Mode with an output frequency of 35 MHz at a level of 0 dBm as displayed
ontheGen/Mon Mtr display. Connect the RF In/Out Jack to the Counter In Jack of the UUT. Select the
Frequency Counter Display and verify a frequency reading of 35 MHz.
2. Set the UUT to the Generate FM Mode and select the Gen/Mon Mtr Display. Turn the Code Synthesizer
and Ext Modulation sources OFF. Select the Narrow Band Mode and adjust the 1 kHz Level Control for
a 5 kHzFM deviation reading. Connect the Mod Out Jack to the Counter Input Jack of UUT. Select the
Frequency Counter Display and verify a nominal frequency reading of 1 kHz.
5-137. DVM
1. Maintaining the same conditions as in paragraph 5-136.2, select the DVM Display and the AC Mode on
the display. Verify a DVM reading of 0.707 vrms ±0.04 vrms.
2. Select the DC Mode and verify a near zero volt DC reading.
5-138, Scope Mode
1. Set the UUT to the Scope AC display mode and connect the scope vertical input jack to the Mod Out
Jack. Enable the internal 1 kHz modulation source. Verify the operation of each position of the vertical
input range switch and the vertical vernier gain control.
2. With the same connection as in paragraph 5-138.1, verify the operation of each position of the
Horizontal Control and the Horizontal timebase vernier.
3. With the Horizontal Control set to the External Mode, connect the External Horizontal jack to the Mod
Out jack. Verify a horizontal line whole length is variable with the Horizontal Vernier.
4. Connect the Vert In jack to the Mod Out jack on the UUT. Set the vert and horizontal controls for a
convenient display. Verify that a steady sync is obtained in either the Norm or Auto modes and that the
point of triggering is adjustable with the level control. Remove the input signal and verify no horizontal
sweep in the Norm mode and the presence of a horizontal sweep in the Auto mode.
5-139. SINAD Meter
1. Set the UUT for the Generate FM Function, Narrow Band Mode, and the Tone Memory Display. On the
Tone Table set Tone A for 2000.0 Hz.
2. Select the Gen/Mon Mtr Display and the Tone A Cont Modulation Mode. Turn the Ext Level and the 1
kHz Level Controls OFF. Adjust the Code Synth Lvl Control for an FM deviation of 1.88 kHz as read on
the CRT display.
3. Without disturbing the Code Synth Lvl Control, turn the Code Synthesizer OFF. Turn ON the 1 kHz
Level Control and adjust for an FM deviation of 7.5 kHz on the CRT display.
4. Connect the Mod Out Jack to the SINAD Input Jack on the UUT. Verify a SINAD reading greater than
25 dB.
5. Set the Code Synthesizer to the Continuous Mode and verify a SINAD reading 12 dB ±1 dB.
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