HP 75000 C Series Service Manual page 61

Note
If the calibration time exceeds 1 minute, the calibration i s invalid.
Recycle power then repeat procedure. If the condition repeats the
instrument is malfunctioning. Refer
to
the Service Manual for
information on correcting the malfunction before proceeding.
Example
5.
After calibration is complete (LED'S to off), read the
calibration event register to verify that no errors were
generated during the procedure.
If "0" is returned, the calibration was successful.
If
"0"
is not returned, the calibration attempt was
unsuccessful. See Chapter 4, CALibrate Subsystem for
more information.
6. Disconnect cable from input 2 and reconnect to input 3. Repeat
steps 4 and
5
for input
3.
7. Disconnect cable from input 3 and reconnect
to
input 4. Repeat
steps 4 and 5 for input
4.
8. When complete, disconnect BNC cable and perform the Logic
Trigger Calibration Procedure (if necessary).
The following example shows how to perform a time null calibration.
The
example is written using:
an HP-IB select code of 7, primary address of 09, and
secondary address of 05 for the Oscilloscope
COMPatible programming language
an HP Series 20W300 Computer with HP BASIC
Execute:
10 OUTPUT 70905;"*CLS"
Ckar status.
20 OUTPUT 70905;"*RST"
Resets the Oscilloscope to its default
state.
30 OUTPUT 70905; "SUMM: PRES"
Presets the O s c ~ ~ ~ ~ s c ~ p e .
40
FOR 1=2 TO
4
Input testing loop.
50 OUTPUT 70905; "CAL:SCAL:TNUL CHlTO"6VALS (I)
Selects channel
I
to n time null
calibration routine (n=input 2-4).
60 OUTPUT 70905; TAL: SCAL: BCAL-
Starts time null calibration routine.
7 0 OUTPUT 7 0905; "SuMM: QUES
:
CAL?"
Read calibration event register.
80 ENTER 70905;C
Enter calibmtion event register results.
90 PRINT C
Print calibration event register results.
100 PAUSE
Pause to connect next input.
110 NEXT I
Repeat fir inputs 3-4.
120 END
Terminate program.
Adiustments 5-7