Appendix B 213
Information for Replacing 4278A with 4288A
Functional Comparison and GPIB Command Correspondence
B. Information for Replacing
4278A with 4288A
GPIB command correspondence
Measurement signal
Functional comparison
GPIB command correspondence
High-accuracy measurement (HI-ACC) mode
The 4288A does not have a function corresponding to the 4278A’s high-accuracy
measurement (HI-ACC) mode at the measurement frequency of 1 MHz.
Table B-2 Correspondence of measurement parameter setup commands
Measurement parameter GPIB command
Primary
parameter
Secondary
parameter
4278A 4288A
Cp
D MPAR1 :CALC1:FORM CP :CALC2:FORM D
Q MPAR2 :CALC2:FORM Q
G MPAR3 :CALC2:FORM G
Cs
D MPAR4 :CALC1:FORM CS :CALC2:FORM D
Q MPAR5 :CALC2:FORM Q
Rs MPAR6 :CALC2:FORM RS
4278A 4288A
Measurement frequency 1 kHz, 1 MHz 1 kHz, 1 MHz
Frequency shift (1 MHz) +2%, +1%, 0%, -1% +2%, +1%, 0%, -1%
Measurement signal
level (OSC level)
Allowable setup
range
0.1 V to 1 V 0.1 V to 1 V
Resolution 0.1 0.01
Level monitor Unavailable Current value, voltage value
Table B-3 Correspondence of measurement signal setup commands
Function
GPIB command (option number)
4278A 4288A
Measurement
frequency
1 kHz FREQ1 :SOUR:FREQ 1KHZ
1 MHz FREQ2 :SOUR:FREQ 1MHZ
Frequency shift
*1
(1 MHz)
0% Normal :SYST:FSH 0
+1% Option 003 :SYST:FSH 1
-1% Option 005 :SYST:FSH -1
+2% Option 006 :SYST:FSH 2
Measurement signal level (OSC level) OSC= :SOUR:VOLT
*1.The frequency shift of the 4278A is fixed to a constant value, depending on the config-
uration options. No command is available to alter the value.
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