HP 8340B Manual page 234

EXTERNAL MODULE LEVELING ADJUSTMENT (Cont'd)
5-19.
Procedure
1. Connect the equipment as shown in Figure 5-70. Turn the OUTs LINE switch ON and allow 30
minutes for the equipment to warm up.
2. On the DUT, press [INSTRPRESET] [CW] [4] [GHz][AM] [SHIFT][XTAL][0] [dBm]to turn AM
on and to set the OUT to external module power leveling of 0 dBm. Press [SHIFT] [GHz][3] [5]
[Hz] [SHIFT][MHz][1] [2] [Hz] [SHIFT][kHz] [2] [2] [Hz] to access Cal Constant 35.
If, in step 3, Cal Constant 35 is adjusted for a negative voltage reading on
the DVM (i.e., —0.002V), it is possible that the DUT's OVERMOD annun-
ciator will turn on. If this occurs, rotate the DUT's rotary knob to turn the
OVERMOD annunciatorOFF and then adjust the DVM for the proper volt-
age reading.
3. Using the OUT's front panel rotary knob, adjust Cal Constant 35 (range is —100 to + 100) until the
DVM reads 0.000 V
4. Using the OUT's
Constant 37 (range is —100 to + 100) until the OUT's POWER dBm display indicates 0.0 dBm.
5. On the DUT, press [SHIFT][XTAL][1] [0] [dBm]to set the external module power to -1-10 dBm.
Press [SHIFT] [GHz] [3] [6] [Hz] [SHIFT][ENTRYOFF] to access Cal Constant 36.
6. Using the DUT's rotary knob, adjust Cal Constant 36 (range is —100 to +100) until the DVM reads
0.3 V ±2 my.
7. Using the DUT's
Constant 38 (range is —100 to ± 100) until the DUT's POWER dBm display indicates 10.0 dBm.
8. Repeat steps 2 through 8 to ensure that the adjustments are within tolerance.
9. On the OUT, press [SHIFT] [MHz] [1] [4] [Hz] [SHIFT][kHz] [5] [3] [4] [9] [Hz]. Wait for
'CALIBRATION STORED" to be displayed in the OUT's ENTRY DISPLAY and then press [INSTR
PRESET].
5-130 Adjustments
2 my.
±
step key, access Cal Constant 37. Using the OUT's rotary knob, adjust Cal
[&]
step key, access Cal Constant 38. Using the OUT's rotary knob, adjust Cal
[&]
NOTE
HP 8340B/41B