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DVM ZERO
(FlNE)
DVM
ZERO (COARSE)
5-115.
DVM Zero
1.
Select the DVM Display and the DC Mode on the R2001 B.
2.
Short the center conductor of the DVM Input Jack to ground.
3.
Adjust the DVM Zero (Coarse) and the DVM Zero (Fine) Potentiometers on the Front Panel Interface
Board (Figure 5-14) for a zero reading on the DVM Display.
5-116.
Spectrum Analyzer Centering
1.
Select the Spect Analyzer Display on the R2001 B.Set the Dispersion Control on the front panel to the 1
MHz position. (full counter clockwise) Set the center frequency of the analyzer to 10.0 MHz.
2.
Connect the 10 MHz Output on the rear panel to the RF Input on the front panel. Set the RF Step
Attenuator to obtain a convenient spectral display.
3.
Adjust the Spectrum Analyzer Centering Potentiometer on the Scope/DVM Control Board (Figure 5-
15) so that the spectral line on the CRT is centered about the center graticule line.
5-117.
Horizontal Time Base
1.
Select the Tone Memory Display and the Generate FM Function on the R2001B. Program tone A for
20.0 Hz and Tone B for 2000.0 Hz.
2.
Select the Modulation Display. Set the Oscilloscope Controls for 2.5 kHz/Div vertical range, Auto
Trigger, and 10 mSec/Div horizontal sweep range. Set the Horizontal and Vertical Vernier Controls to
their Cal positions.
3.
Set the Code Synthesizer for Continuous, Tone A, and turn up the CodeSynth Level to obtain a nearly
full scale sinusoidal waveform on the CRT. Turn the Ext Level and the 1 kHz Level Controls to the off
position.
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i
5-28
PEAK DETECTORS ZERO
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Figure 5-15.
Scope/DVM Control Alignment Points
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4.
Adjust the Coarse Time Base Calibration Potentiometer on the Scope Amplifier Board (Figure 5-16) so
that one cycle of the displayed waveform occurs in 5 em along the horizontal axis. Use t11e Vertical and
Horizontal Position controls to center and to move the waveform so that the 5 em are measured in the
middle of the screen to avoid nonlinearities near the edge of the CRT.
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Figure 5-16.
Horizontal Time Base Alignment Points
5.
Set the Oscilloscope Horizontal Control for a 10011 Sec/Div sweep rate and select the Tone B output
on the Code Synthesizer.
6.
Adjust the Fine Time Base Calibration Capacitor on the Scope Amplifier Board (Figure 5-16) so that
one cycle of the displayed waveform occurs in
5
em along the horizontal axis. Use the Vertical and
Horizontal Position controls to center and to move the waveform so that the 5 em are measured in the
miildle of the screen to avoid nonlinearities near the edge of the CRT.
5-29
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