1. Remove the jumpers between terminals TB1/J1-4, and TB1/J1-5.
2. Connect a 5K Ohm, 1% 0.5w resistor between TB1/J1-4 and TB1/J1-6.
3. Connect the programming current source between terminals TB1/J1-4 (positive) and
TB1/J1-6 (negative).
Figure 3.7: Remote Programming by External Current, Voltage Mode
.
3.3.3 REMOTE PROGRAMMING OF CURRENT CHANNEL
The front panel's current control is disabled in this programming mode. Remote programming
of the current channel (Current mode operation) can be implemented at the rear panel by one
of the following:
1. External resistance of 0-100 ohm
2. External DC Voltage of 0-100 mV (0-5V or 0-10V is an option)
3. External DC Current of 0-1mA
The wire connecting the programming terminals of the supply to the remote programming
device should be twisted or, if strong AC or RF fields are present, shielded.
CAUTION
If the remote programming function fails or is inadvertently adjusted so that
the output voltage is programmed to levels of greater than 15% above
ratings, damage to the output filter capacitors may occur. To protect against
this, it is suggested that the overvoltage protection be adjusted to limit the
maximum voltage excursion and safely shut the power supply down.
A.
External Resistance :
A variable resistance of 0 to 100 Ohms programs the output from zero to full rated current.
The output of the supply can be set to a fixed current by using a fixed programming resistor
which can be calculated from the following equation:
R
prog.
= (Desired Current Full Rated Output Current) X 100 ohm
+
1. Remove the jumper between terminals TB1/J1-10 and TB1/J1-11.
2. Connect the programming resistance between terminals TB1/J1-10 and TB1/J1-12.
83-473-000 Revision J
3 - 7
Operating Instructions
