BK Precision 4017B, Instruction Manual

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18
Step 8
Press the TTL/CMOS button. The CMOS LED will light and the TTL LED will
not light. Turn the CMOS LEVEL knob counter clockwise until CMOS level
reaches 4.0V. The LCD display should look like Figure 17.
Step 9
Press the SWEEP INT/EXT button. Switch the current mode to INTERNAL SWEEP when the INT LED lights.
Calculating the frequency sweep parameters .
The frequency stop frequency must be 2MHz to get a 6 MHz frequency range sweep. Using the formula given in section 3.1.7, the
fraction parameter set by turning
SWEEP WIDTH knob must be 4 because the stop frequency represents a fraction of the start
frequency; the fraction set by turning the SWEEP WIDTH rotary knob,
Step 10
Turn SWEEP WIDTH knob counter clockwise until the displayed sweep width
parameter reaches 4. The LCD display should look like Figure 18.
Step 11
Turn SWEEP TIME knob clock wise until the displayed sweep time parameter
reaches 21.33s. The LCD display should look like Figure 19.
All the sweep parameters should be set and the asymmetric square wave signal at the OUTPUT jack should be sweeping a 6 MHz
frequency range on 21.33s. There should be a CMOS type signal on the TTL/CMOS output jack whose frequency follows the main
output signal frequency.
Step 12 (automatic step performed)
After setting all the parameters at the limits of the frequency range sweep, the LCD display must look like Figure 20, when internal
sweep starts, and Figure 21, when internal sweep stops.
8.0000MHz 10M
4.0 V CMOS OUT
FREQUENCY
RANGE (Hz)
LEVEL
Peak-to-Peak
(into 50
Ω
)
Figure 17: LCD example of displaying
CMOS output level
8.0000MHz 10M
4 SweepWidth
FREQUENCY
RANGE (Hz)
LEVEL
Peak-to-Peak
(into 50
Ω
)
Figure 18: LCD example of displaying sweep
width parameter
8.0000MHz 10M
21.33s SweepTime
FREQUENCY
RANGE (Hz)
LEVEL
Peak-to-Peak
(into 50
Ω
)
Figure 19: LCD example of displaying sweep
time parameter
8 .0000MHz 10M
500mV Output
FREQUENCY
RANGE (Hz)
LEVEL
Peak-to-Peak
(into 50
Ω
)
Figure 20: LCD example of sweep
start frequency
2 .0000MHz 10M
500mV Output
FREQUENCY
RANGE (Hz)
LEVEL
Peak-to-Peak
(into 50
Ω
)
Figure 21: LCD example of sweep
stop frequency