2. Connect Output terminal to oscilloscope and Set oscil-
loscope so that sweep may be obseved. Note that 8020
sweeps down.
3. Change 8020 Sweep Time setting throughout the range
and observe that sweep time changes accordingly.
4. Change Sweep type setting to UP and observe that 8020
sweeps up. 5. Connect Sweep Out terminal on the rear
panel to the oscilloscope and observe that DC level changes
2V for a full sweep cycle.
6. Connect Marker out to the oscilloscope and observe that
output changes from 0V to -5V when marker frequency is
reached
7. Change Trigger Mode to Gated
8. Connect an external gating signal to the TRIG IN termi-
nal. Observe that the 8020 sweeps as long as the gating
signal remains high
9. Change 8020 Trigger Mode to Sweep and Triggered and
observe that the 8020 sweeps once for every rising edge of
the triggering signal
NOTE
It is also possible to check the sweep in the
different trigger modes using the MANUAL
button where as long as it is depressed serves
as gating signal in gated mode and as trigger
in triggered mode.
5-10-10. VCO Control
Control amplitude: 0 V to 10 V DC +/-20 %.
VCO control range: 1000:1 change from frequency setting at
2000 counts
Equipment: Power Supply, DMM, Counter
1. Set 8020 as follows:
CONTROL POSITION
Frequency 2.000 MHz
Amplitude 1.50 V
Offset 0.00 V
Trigger Mode Continuous
Display Modify FREQ
Output Squarewave
Operating Mode VCO On
2. Apply power supply output to VCO IN connector and
slowly increase power supply amplitude from 0V to 10 V
+/-20% DC. Verify with counter that output frequency
changes from 2.000 MHz to about 2 KHz.
NOTE
Performance verification of VCO operation
should be carried out with a very clean DC
voltage. A noisy Power supply output will
cause phase modulation in the 8020 output.
5-10-11. Pulse Width (model 8021)
Accuracy Specifications: +/-(3 % + 4 nSec) from 25 nS to
99.9 mS; +/- 10% from 100 mS to 9.99 S
Equipment: Counter, Oscilloscope, 50 ohm Feed-through
Termination, BNC Cable
1. Set 8021 as follows:
CONTROL POSITION
Amplitude 1.50 V
Offset 0.00 V
Trigger Mode Continuous
Display Modify WID
Operating Mode Pulse
Output Squarewave
2. Set counter to pulse width measurement.
3. Connect 8021 to Channel A of the counter. Set 8021
Pulse Width and Frequency and verify counter reading as
follows:
FREQ WIDTH COUNTER
SETTING SETTING READING
2.000E 6 99.9E-9 100 nS +/-7 nS
500E 3 500E-9 500 nS +/-19 nS
50.0E 3 5.00E-6 5.00 uS +/-.15 uS
5.00E 3 50.0E-6 50.0 uSec +/-1.5 uS
500E 0 500E-6 500 uS +/-15 uS
50.0E 0 5.00E-3 5.00 mS +/-.15 mS
5.00E 0 50.0E-3 50.0 mS +/-1.5 mS
1.00E 0 500E-3 500 mS +/-50 mS
100E-3 5.00E 0 5.00 S +/-500 mS
The following ranges are to be checked using an oscil-
loscope.
4. Connect 8201 OUTPUT to the oscilloscope input and
verify measurements as follows:
FREQ WIDTH OSCILLOSCOPE
SETTING SETTING READING
10.00 E 6 25.0 E-9 25 nS +/-4 nS
Model 8020 Maintenance And Performance Tests
Page 5-7
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