HP 8642A Operation And Calibration Manual

Model 8642A/B
Operation
Relative Amplitude (cont'd)
REL OFF
How to Turn Off the Relative Mode
HP-IB
Codes
Comments
[AMPTQJ REL OFF ( [---sR!FTJ [OFF ON I ), or
(AMPTfYJ REF SET (( SE!lED CEJ3£Q]) COFCQf[), or
Select a volts key with amplitude as the active function (volts units are always
absolute).
Keys
Codes
Keys
REF SET
APRS dBm
REL ZERO
APRZ
dB
REL OFF APRF V
AMPTD AP mV
OFF ON APRSOF, APR SON }J.v
EMF
EMON, EMOF
dB}J.V
Range of Amplitude Reference Settings
Allowable ranges for the amplitude reference settings:
+59.9 dBm to - J 40 dBm
4.995V to 0.023 uV
9.99 EMF V to 0046 EMF uV
Codes
OM or DB
DB
or OM
VL
MV
UV
DU
Note that the maximum for the dBm setting is greater than that for the voltage
settlllg. If you want to set a higher voltage reference than 4.995V (9.99 EMF V),
convert the value to dBm and set the reference set value as high as +59.9 dBm (221 V
or 442 EMF V)
Converting Amplitude Units
Refer to Amplitude Units Conversion on page 3-205 for information about changing
amplitude values from one unit to another.
When the dEm and dBnV Keys Function as dBuV Terminators
Both the dBm key ( [GRZ DBM I ) and the dBuV key ( CB~A~D~o~;6~1 ) fUllction as dBu V
terminators when the amplitude is set in dBuV. All other relative amplitude settings
use only the dBm key as a dB terminator.
HP-IB. Either DB 01' DM
When in the relative amplitude mode, DM does not set dBm; DM and DB set dB
relative amplitudes. Therefore, amplitude relative must bG turned off (APRF) to have
DM mean dBm.
EMF Conversions Are Automatic
Relative settings established in the non-EMF mode will be automatically converted to
EMF values when that mode is selected. Simdarly, relative settlllgs established in the
EMF mode will be converted to non -EMF values when the EMF mode is turned off.
Amplitllde Settings Interact With Other Instrument Settings
Some settings are limited by the interaction of coupled functions (for example AM
dept hand amplitude) Refer to the appropria te Detailed Opera tillg Instruction for
setting limitations, and be aware that any restrictions are due to the absolute
amplitude, not the relative amplitude setting
3-81

HP 8642A Specifications

General

Brand	HP
Model	8642A
Category	Inverter
Language	English