Appendix E, ALPHABETICAL LISTING OF COMMANDS
E-16
a point is taken. It is zeroed by the NC command and whenever CBD or LEN is
applied without parameters.
MAG[.] Magnitude
In fixed point mode causes the lock-in amplifier to respond with the magnitude value
in the range 0 to 30000, full-scale being 10000.
In floating point mode causes the lock-in amplifier to respond with the magnitude
value in the range +3.000E0 to +0.001E-9 volts or +3.000E-6 to +0.001E-15 amps.
MENABLE [n] Oscillator amplitude/frequency modulation enable command
The value of n enables the oscillator amplitude modulation function in accordance
with the following table:
n Function
0 Oscillator amplitude/frequency modulation disabled
1 Oscillator amplitude modulation enabled
2 Oscillator frequency modulation enabled
MP[.] Magnitude, phase
Equivalent to the compound command MAG[.];PHA[.]
\N n Address command
When the model 7270 is daisy-chained with other compatible instruments this
command will change which instrument is addressed. All daisy-chained instruments
receive commands but only the currently addressed instrument will implement or
respond to the commands. The exception is the \N n command. If n matches the
address set from the front panel the instrument will switch into addressed mode. If n
does not match the address set from the front panel the instrument will switch into
unaddressed mode. Note that the \N n command does not change the address of an
instrument but which instrument is addressed.
NOTE: All instruments must have a unique address.
N Report overload byte
Causes the lock-in amplifier to respond with the overload byte, an integer between 0
and 255, which is the decimal equivalent of a binary number with the following bit-
significance:
Bit 0 X channel output overload (> ±300 %FS)
Bit 1 Y channel output overload (> ±300 %FS)
Bit 2 X2 channel output overload (> ±300 %FS)
Bit 3 Y2 channel output overload (> ±300 %FS)
Bit 4 CH1 output overload
Bit 5 CH2 output overload
Bit 6 CH3 output overload
Bit 7 CH4 output overload
NC New curve
Initializes the curve storage memory and status variables. All record of previously
taken curves is removed.
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