Excessive High Frequency Sine Or Triangle Roll Off; Low Frequency Square Wave Tilt - Wavetek 193 Instruction Manual

Functional block isolation:
1. Verify power supply voltages are within
±
5% of
nominal, and less than 100 mVp-p of ac ripple. If
not, refer to paragraph 6.4.1
2. If none of the above conditions apply, refer to
figure 6-6.
6.3.9 Low Frequency Square Wave Tilt
Improperly set controls:
1. Scope improperly set to ac.
2. If none of the above conditions apply, refer to
figure 6-5. Use a X10 probe with a very short
ground lead and a spectrum analyzer, RF
voltmeter or a 200 MHz bandwidth scope when
performing sine or triangle roll-off tests.
6-6
Functional block isolation:
1. Verify power supply voltages are within
±
5% of
nominal with less than 100 mVp-p of ac ripple. If
not refer to paragraph 6.4.1.
6.3.8 Excessive High Frequency Sine or Triangle
Roll Off
Improperly set controls:
1. Excessive dc offset overdriving output amplifier.
2. Verify 500 load on the cable at oscilloscope end.
Functional block isolation:
1. If there is no ECl square wave at U6 pin 10, refer
to paragraph 6.4.7. If there is an ECl square
wave, refer to paragraph 6.4.8.
Figure 6·5. High Frequency Waveform Troubleshooting
REFER TO
PREAMPLIFIER
GUIDE 6.6.14
SQUARE SHAPER
GUIDE 6.4.12
REFER TO
TRIANGLE
BUFFER GUIDE
6.4.6
REFER TO
LOOP DELAY
COMPENSATION
GUIDE 6.4.3
CHECK
OUTPUT
ATTENUATOR
REFER TO
OUTPUT
AMPLIFIER
GUIDE 6.4.15
YES
REFER TO
SINE CONVERTER
GUIDE 6.4.13
INCLUDING
SINCMP LINE
REFER TO
PREAMPLIFIER
GUIDE 6.4.14
NO