BG7 module adjustment procedures
2. Restart the ins
trument in Factory mode:
a. Press and hold the MODULE, ENTER,andFront Panel ENABLE
buttons simultaneously.
b. Continue holding the buttons until the message TG8000 Booting...
displays.
c. When the message TG8000 Booting... displays, release the MODULE
and ENTER buttons. Continue holding the Front Panel ENABLE
button.
d. When the message TG8000 Start up with Factory Mode displays,
release the Front Panel ENABLE button.
3. Select the DAC Offset (0 V DC) calibration signal for BLACK 1 through
BLACK 4 as follows:
a. Press the MODULE button to display the BG7 main menu.
b. Press the up (▲)ordown(▼) arrow b utton to select CALIBRATION.
c. Press the left (◄)orright(►) arrow button to select BLACK 1,andthen
press the ENTER button.
d. Press the left (◄)orright(►)arrowbuttontoselectCAL : DAC Offset
(0 V DC), and then press the ENTER button.
e. Press the BACK button.
f. Repeat parts c through e of this step to select the calibration signal for
BLACK 2 through BLACK 4.
4. Locate variable resistor R491 on the BG7 circuit board. (See Figure 8-1.)
5. Adjust R491 so that the output offset is 0 V ±1 mV.
6. Change the BNC cable connection from BLACK 1 connector to the BLACK 2
connector on the BG7 module.
7. Locate variable resistor R591 on the BG7 circuit board. (See Figure 8-1.)
8. Adjust R591 so that the output offset is 0 V ±1 mV.
9. Change the BNC cable connection from BLACK 2 connector to the BLACK 3
connector on the BG7 module.
10. Locate variable resistor R691 on the BG7 circuit board. (See Figure 8-1.)
11. Adjust R691 so that the output offset is 0 V ±1 mV.
12. Change the BNC cable connection from the BLACK 3 con nector to the
BLACK 4 connector on the BG7 module.
13. Locate variable resistor R791 on the BG7 circuit board. (See Figure 8-1.)
14. Adjust R791 so that the output offset is 0 V ±1 mV.
8–4 TG8000 Multiformat Test Signal Generator Service Manual
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