HP 85422E, User Manual

Page: 32 / 229

Calibrating the EMI Receiver
When either the HP 8542E or HP 8546A is turned on, the receiver's
amplitude calibration data for INPUT 1 and INPUT 2 is veried. If
the data is valid, it is downloaded to the RF lter section from the
nonvolatile storage in the receiver RF section. If the data is not valid,
the RF lter section will use its standalone factory calibration data
and display a \Cal Needed " message .
Note
PRESET or IP does not download the receiver's calibration data.
Using
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
CAL FETCH
T o retrieve the receiver's calibration data from internal memory ,
press:
4
CALIBRA TE
5
NNNNNNNNNNNNNNNNNNNNNNNNNNNNN
CAL FETCH
If the data is not valid when the calibration data is retrieved from
memory using the cal fetch function, one or both of the following
messages will be displayed:
INPUT 1: Data Not valid
CAL INPUT 1 required
INPUT 2: Data Not valid
CAL INPUT 2 required
V erifying the Receiver's Calibration
1. T o verify the amplitude calibration data, press:
4
CAL CHECK
5
2. If the data is not valid, the calibration check procedure is stopped
and the message \Cal Needed " is displayed.
3. If the data is valid, the calibration check is completed and the
message \Calibration OK " is displayed.
Note
Only the amplitude accuracy at 300 MHz 62 dB is veried when a
4 CAL CHECK 5 is executed. T o ensure the receiver meets its specications
at all frequencies , a calibration must be performed.
Calibration 2-3