Chroma 6404 - Data Lock; Ext Prog

Local Operation
3-7
3. If these are not the desired setting values, repeat
step 2 to step 3 for other memory channels until the
right one is found.
55.0
60.0
0.00
4. Confirm by pressing ENTER .
135.5
82.0
0.00
3.5 Data Lock
After completion of setting values for outputs, the front panel keypad can be locked to avoid
incident changes.
To lock setting output data, press SHIFT
to light up the “SHIFT” LED. Then, press LOCK ,
the same as the 0
key, to turn on the “LOCK” LED.
To unlock, press SHIFT
to light up the “SHIFT” LED. Then, press LOCK , the same as
the 0
key, to turn off the “LOCK” LED.
3.6 Ext Prog
The 6404/6408 AC source allows the user to use an external DC voltage level as a linear
control reference for output Vrms. The relationship of Vout and the Vref is listed as
following:
Vout = Vref ÷ 10V × Vfs
Vout : The Vrms output of the 6404/6408
Vref : DC level of the external control voltage
Vfs : The current setting of full scale (full range) of output Vrms.
When the “EXT PROG” is active, the user is not allowed to program the value for Vout. The
user can still program the value for output F. To enable this function, the user must connect
the external device of controlled DC to the “EXT REF.” port of 6404/6408 on the rear panel
as illustrated in the section 2.6.
To enable it, press the SHIFT
to light up the “SHIFT” LED. Then, press EXT PROG , the
same as the
OUT/QUIT key, to turn on the green “EXT PROG” LED. And quit “SHIFT”
mode by pressing the
SHIFT to turn off the “SHIFT” LED.
The user may press the numeric keypad and ENTER
or turn for changing output
frequency to the desired.
To disable it, press the SHIFT
to light up the “SHIFT” LED. Then, press EXT PROG , the
same as the OUT/QUIT
key, to turn off the green “EXT PROG” LED.