HP 8340B Manual page 197
Synthesized sweeper (including options 001, 004, 005,006, and 007)
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5-15. ALC ADJUSTMENTS (Cont'd)
7. Note indication on the DVM. This value is
step 8.
8. Calculate "Corrected Video Resistance in Hi Band,"
RvH
(RvM
where:
Corrected Video Resistance in High Band
RvH
=
RvM
VvM
Thermistor Resistance measured in step 4 above.
9. Use the Value of RvH found in step 8 above and select the resistance values for A25R36 and
A25R37 from Table 5-6.
Disconnect the high band detector All cable W27 from the SMB-to-BNC adapter and connect the
10.
low band detector A12 cable W26 to the adapter as shown in Figure 5-45.
11. Connect the DVM at the output of the Power Supply and check that the output is still at 5.00
Vdc. Move the DVM connections back to the SMB-to-BNC adapter as shown in Figure 5-45.
12. Note indication on the DVM. This value is
stepl3.
13. Calculate "Corrected Video Resistance in Low Band,"
RVL
(RvM —
where:
Corrected Video Resistance in Low Band
RvL
RvM
VvM X
Value measured in step 12 above.
VvM
Thermistor Resistance measured in step 4 above.
=
RT
14. Use the value of
A25R115 from Table 5-7.
Table 5-6.
RVH (Ohms)
800-870
870-950
950-1050
1050-1160
1160-1270
1270-1380
1380-1490
1490-1600
HP 8340B/41B
100) >< 24000/(RT + 4000)
—
Value measured in step 7 above.
=
680) X 24000/(RT + 4000)
200 Ohms/mV
found in step 13 above and select resistance values for A25R109 and
RvL
Selected Values of High Band Temperature Compensation Resistors in A25
A25R36 (Ohms)
for high band and will be used for calculations in
VvM
as follows:
RvH,
for low band and will be used for calculations in
VvM
as follows:
RvL,
9090
8250
7500
6810
6190
5620
5110
4640
0.01
±
A25R37 (Ohms)
6190
5620
5620
5110
4640
4220
4220
3830
Adjustments
5-91
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