AVG7 module adjustment procedures
2. Restart the ins
trument in Factory mode:
a. Press and hold the MODULE, ENTER,andFront Panel ENABLE
buttons simul
taneously.
b. Continue holding the buttons until the message TG8000 Booting...
displays.
c. When the message TG8000 Booting... displays, release the MODULE
and ENTER bu
ttons. Continue holding the Front Panel ENABLE
button.
d. When the me
ssage TG8000 Start up with Factory Mode displays,
release the Front Panel ENABLE button.
3. Select th
e DAC Gain (GBR) : 0 mV calibration signal as follows:
a. Press the MODULE button to display the AV G 7 main menu.
b. Press the up (▲)ordown(▼) arrow button to select CALIBRATION.
c. Press the left (◄)orright(►) arrow button to select DAC Gain (GBR),
and then press the ENTER button.
d. Press the left (◄)orright(►) arrow button to select 0mV, and then press
the ENTER button.
4. Locate variable resistor R856A on the AVG7 circuit board. (See Figure 6-1.)
5. Adjust R856A so that the output offset is 0 V ±1 mV.
6. Move the BNC cable from the upper CH 1 connector to the upper CH 2
connector on the AVG7 Generator module.
7. Locate variable resistor R756A on the AVG7 circuit board. (See Figure 6-1.)
8. Ad
just R756A so that the output offset is 0 V ±1 mV.
9. Move the BNC cable from the upper CH 2 connector to the upper CH 3
c
onnector on the AVG7 Generator module.
10. Locate variable resistor R656A on the AVG7 circuit board. (See Figure 6-1.)
11. Adjust R656A so that the output offset is 0 V ±1 mV.
12. Move the BNC cable from the upper CH 3 connector to the upper CH 1
connector on the AVG7 Generator module.
13. Press the left (◄
)orright(►)arrowbuttontoselect700.397mV,andthen
press the ENTER button.
14. Locate variable resistors R851A (coarse) and R851B (fine) on the AVG7
circuit board. (See Figure 6-1.)
15. Adjust R851A and R851B so that the output gain is 700.4 mV ±1 mV.
TG8000 Multiformat Test Signal Generator Service Manual 6–5
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