Mainframe clock adjustment
Mainframe clo
ck adjustment
The only adju
stment in the TG8000 mainframe is for the frequency of the master
clock oscillator.
There are tw
o methods for adjusting the frequency of the master clock. You can
use a frequency signal generator or you can use a GPS7 module by locking the
master clock to a GPS signal. Procedures for both methods are provided below.
NOTE. If your TG8000 generator has a GPS7 module installed, you need to use
the GPS7 module to adjust the master clock frequency. When you use the GPS7
module to adjust the master clock, you can adjust the clock while the instrument is
in operat
ion, which avoids any system downtime o r any warm-up period.
Requirements for adjustment
Before proceeding, note the following requirement.
Warm-up period
The in
strument requires a 20 minute warm-up time in a +20 °C to +30 °C
environment before it is adjusted. Adjustments done before the operating
temperature has stabilized may cause errors in performance. In addition, the signal
generator requires appropriate warm-up time to meet the frequency accuracy.
If you are using a GPS7 module to adjust the master clock, an external antenna or
GPS signal must be connected during the warm-up p eriod.
To adjust the master clock using a frequency signal generator
Use this procedure to adjust the frequency of the mainframe master clock if you
do not have a G PS7 module.
Required eq uipment
The following table lists the equipment required to adjust the master clock
frequency using a frequency signal generator.
Table 2-1: Equipment required to adjust the master clock using a signal generator
Item No. Minimum requirement Recommended equipment
Analog genlock module 1
Tektronix AGL7 module
Frequency standard 1 Frequency: 10 MHz ±1×10
–9
Amplitude: 8 dBm
Tektronix GPS7 locked to GPS or
equivalent
Spectracom/Pendulum 6689
75 Ω BNC cable
1 Length: 42 inches Tektronix part number 012-0074-00
2–2 TG8000 Multiformat Test Signal Generator Service Manual
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