4.1.6
Level Calibration
The A10A1 board is referenced in this procedure. Some of the adjustments are on the A10
board, others are on the A10A1 piggyback board.
1.
On A10, monitor TP3 with a DVM. Check for a voltage of 3.2 V +0.01 V; adjust R48 as
necessary.
2.
Connect a power sensor to the RF output.
3.
Set the UUT to 2.1 GHz. On the A10 board, make the checks and adjustments shown in
Table 4-4. Make adjustments 0.03 dB.
4.
Monitor TP1 with the scope on the A10A1 PC board. Check the power levels in
Table 4-4. If oscillations occur during calibration, turn the LGAIN pot R50 (on A10)
CCW until the oscillations stop. Adjust appropriate pots for proper levels.
POWER
ENTER 2.1 GHz
ENTER 1 GHz
0 dBm
LIN >2, pot R4
LIN <2, pot R3
10 dBm
GAIN >2, pot R29
GAIN <2, pot R27
-9 dBm
OFFSET >2, pot R30
OFFSET <2, pot R28
Extended Vernier Leveling
The following steps extend the leveling range from +15 to -9 dBm to a leveling range of +15 to
-20 dBm.
1.
Select 2.1 GHz. Press SHIFT ATTEN to ON. Enter a LEVEL of -20 dBm.
2.
On the A10 board, adjust R30 OFFSET >2 for a reading of -19.8 dBm +0.1 dB on the
power meter.
3.
Select 1 GHz. On A10, adjust R28 OFFSET <2 for a reading of 19.8 dBm. Recalibrate
the 0 and 10 dB points at both 1 GHz and 2 GHz, as required.
4.
On the front panel, connect the power meter to RF out. Use data entry functions on the
front panel to step from +10 dBm to -20 dBm. This checks the 1 dB linearity from 10 to
-20 dBm. This should be 0.3 dBm.
Table 4-4. Level Calibration Pot Adjustments
Calibration and Testing
Manual No. 120AM00250, Rev C, September 1998
4-5
Содержание GT 9000
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