585
Chapter 14, Diagnostics Descriptions
Description of RF Diagnostics (RFDIAGS3)
N:\mkt\MANUALS\HP8924C\ALR\diagnos.fb
Output A26
Table 125
A26 Output Tests
Measurement
Explanation and Suggestions
Measurement Point
+8 V Power
Supply
The +8 Vdc supply generated on the Output assembly
is measured. The voltage measured by the DVM is the
actual voltage divided-by-2.
DVM:OUT_POS_8V
−
6 V Power
Supply
The
−
6 Vdc supply generated on the Output assembly
is measured. The voltage measured by the DVM is the
actual voltage divided-by-2.
DVM:OUT_NEG_6V
Amplifier Bias
Voltage
The bias voltage is measured on the output amplifier.
DVM:OUT_AMP_BIAS
Carrier Level
DAC
The carrier level DAC is checked by turning on each
bit, one at a time, and measuring the voltage output
with each bit turned on. It is also checked with all bits
on. The limits are calculated based on the actual volt-
age measured for the
−
6 V supply in a previous test.
The bit value (B) is calculated as (
−
6 V actual)
×
4
÷
6
÷
4096.
DVM:OUT_LEVEL_REF
Filter Tune
DAC
The Filter Tune DAC is checked by turning on each
bit one at a time and measuring the voltage output
with each bit turned on. It is also checked with all bits
on. The limits are calculated based on the actual volt-
age measured for the
−
6V supply in a previous test.
The bit value (B) is calculated as -1
×
(
−
6 V actual)
×
2
×
422
÷
984
÷
4096.
DVM:OUT_TUNE_FILTER
Open Loop ALC
Drive
This test opens the ALC Loop and checks that the
voltage from the Level DAC appears at the modula-
tor, input. The carrier level DAC is set to 4095 (full
scale). The nominal output of the DAC (Ref) is calcu-
lated based on the actual voltage measured for the
−
6
V supply in a previous test. Ref =
−
1
×
(
−
6 V actual)
×
4
÷
6
×
100
÷
75
×
4095
÷
4096.
DVM:OUT_ALC_DRIVE
Содержание 8924E
Страница 52: ...Contents 52 N mkt MANUALS HP8924C ALR 8924CE TOC A Error Messages ...
Страница 53: ...Contents 53 N mkt MANUALS HP8924C ALR 8924CE TOC Index 633 ...
Страница 54: ...Contents 54 N mkt MANUALS HP8924C ALR 8924CE TOC ...
Страница 70: ...70 Chapter 1 Introduction Hardware and Firmware Enhancements N mkt MANUALS HP8924C ALR intro fb ...
Страница 137: ...137 N mkt MANUALS HP8924C ALR per_adj fb 4 Periodic Adjustments ...
Страница 448: ...448 Chapter 9 HP 8924C E Specifications General Specifications N mkt MANUALS HP8924C ALR specs fb ...
Страница 449: ...449 N mkt MANUALS HP8924C ALR service fb 10 Service Screen ...
Страница 454: ...454 Chapter 10 Service Screen Troubleshooting with the Service Screen N mkt MANUALS HP8924C ALR service fb ...
Страница 455: ...455 N mkt MANUALS HP8924C ALR blkdia fb 11 Block Diagrams ...
Страница 522: ...522 Chapter 11 Block Diagrams Assembly Details N mkt MANUALS HP8924C ALR blkdia fb ...
Страница 530: ...530 Chapter 12 HP 8924C Replaceable Parts Replaceable Parts Listing N mkt MANUALS HP8924C ALR 24c_rpl fb ...
Страница 538: ...538 Chapter 13 HP 8924E Replaceable Parts Replaceable Parts Listing N mkt MANUALS HP8924C ALR 24e_rpl fb ...
Страница 613: ...613 N mkt MANUALS HP8924C ALR errmssg fb A Error Messages ...
Страница 640: ...Index 640 N mkt MANUALS HP8924C ALR 8924CE IX V VOLUME control 61 W Write Protect Cal Data 143 ...